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Articles 1 - 30 of 34
Full-Text Articles in Physics
Local Electronic And Magnetic Properties Of The Doped Topological Insulators Bi₂Se₃:Ca And Bi₂Te₃:Mn Investigated Using Ion-Implanted ⁸Li Β-Nmr, Ryan M. L. Mcfadden, Aris Chatzichristos, David L. Cortie, Derek Fujimoto, Yew San Hor, Huiwen Ji, Victoria L. Karner, For Full List Of Authors, See Publisher's Website.
Local Electronic And Magnetic Properties Of The Doped Topological Insulators Bi₂Se₃:Ca And Bi₂Te₃:Mn Investigated Using Ion-Implanted ⁸Li Β-Nmr, Ryan M. L. Mcfadden, Aris Chatzichristos, David L. Cortie, Derek Fujimoto, Yew San Hor, Huiwen Ji, Victoria L. Karner, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We report β-NMR measurements in Bi2Se3:Ca and Bi2Te3:Mn single crystals using 8Li+ implanted to depths on the order of 100 nm. Above ∼200K, spin-lattice relaxation reveals diffusion of 8Li+, with activation energies of ∼0.4eV (∼0.2eV) in Bi2Se3:Ca (Bi2Te3:Mn). At lower temperatures, the NMR properties are those of a heavily doped semiconductor in the metallic limit, with Korringa relaxation and a small, negative, temperature-dependent Knight shift in Bi2Se3:Ca. From this, we make a detailed comparison with …
Quantum Oscillations From Networked Topological Interfaces In A Weyl Semimetal, I. Lin Liu, Colin Heikes, Taner Yildirim, Chris Eckberg, Tristin Metz, Hyunsoo Kim, Sheng Ran, William D. Ratcliff, Johnpierre Paglione, For Full List Of Authors, See Publisher's Website.
Quantum Oscillations From Networked Topological Interfaces In A Weyl Semimetal, I. Lin Liu, Colin Heikes, Taner Yildirim, Chris Eckberg, Tristin Metz, Hyunsoo Kim, Sheng Ran, William D. Ratcliff, Johnpierre Paglione, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
Layered transition metal chalcogenides are promising hosts of electronic Weyl nodes and topological superconductivity. MoTe2 is a striking example that harbors both noncentrosymmetric Td and centrosymmetric T' phases, both of which have been identified as topologically nontrivial. Applied pressure tunes the structural transition separating these phases to zero temperature, stabilizing a mixed Td–T' matrix that entails a network of interfaces between the two nontrivial topological phases. Here, we show that this critical pressure range is characterized by distinct coherent quantum oscillations, indicating that the difference in topology between topologically nonvtrivial Td and T' phases gives …
Tuning Magnetic Confinement Of Spin-Triplet Superconductivity, Wen Chen Lin, Daniel J. Campbell, Sheng Ran, I. Lin Liu, Hyunsoo Kim, Andriy H. Nevidomskyy, David Graf, Nicholas P. Butch, Johnpierre Paglione
Tuning Magnetic Confinement Of Spin-Triplet Superconductivity, Wen Chen Lin, Daniel J. Campbell, Sheng Ran, I. Lin Liu, Hyunsoo Kim, Andriy H. Nevidomskyy, David Graf, Nicholas P. Butch, Johnpierre Paglione
Physics Faculty Research & Creative Works
Electrical magnetoresistance and tunnel diode oscillator measurements were performed under external magnetic fields up to 41 T applied along the crystallographic b axis (hard axis) of UTe2 as a function of temperature and applied pressures up to 18.8 kbar. In this work, we track the field-induced first-order transition between superconducting and magnetic field-polarized phases as a function of applied pressure, showing suppression of the transition with increasing pressure until the demise of superconductivity near 16 kbar and the appearance of a pressure-induced ferromagnetic-like ground state that is distinct from the field-polarized phase and stable at zero field. Together with …
Induced Interactions And Quench Dynamics Of Bosonic Impurities Immersed In A Fermi Sea, K. Mukherjee, Simeon I. Mistakidis, S. Majumder, P. Schmelcher
Induced Interactions And Quench Dynamics Of Bosonic Impurities Immersed In A Fermi Sea, K. Mukherjee, Simeon I. Mistakidis, S. Majumder, P. Schmelcher
Physics Faculty Research & Creative Works
We Unravel The Ground-State Properties And The Nonequilibrium Quantum Dynamics Of Two Bosonic Impurities Immersed In A One-Dimensional Fermionic Environment By Applying A Quench Of The Impurity-Medium Interaction Strength. In The Ground State, The Impurities And The Fermi Sea Are Phase Separated For Strong Impurity-Medium Repulsions While They Experience A Localization Tendency Around The Trap Center For Large Attractions. We Demonstrate The Presence Of Attractive Induced Interactions Mediated By The Host For Impurity-Medium Couplings Of Either Sign And Analyze The Competition Between Induced And Direct Interactions. A Quench To Repulsive Interactions Triggers A Breathing Motion In Both Components, With An …
Evidence For Target Outer-Shell Excitation Mediated By Electron Correlation In Single-Electron-Capture Collisions Of Slow He²⁺ Ions With Ar Atoms, Z. Y. Song, X. C. Wang, Z. W. Li, K. L. Han, Daniel Fischer
Evidence For Target Outer-Shell Excitation Mediated By Electron Correlation In Single-Electron-Capture Collisions Of Slow He²⁺ Ions With Ar Atoms, Z. Y. Song, X. C. Wang, Z. W. Li, K. L. Han, Daniel Fischer
Physics Faculty Research & Creative Works
We have performed kinematically complete experiments on single-electron capture in slow He2+-Ar collisions. Besides the pure capture to the He+ (n = 2) level, capture into the deep He+ ( n= 1) state with simultaneous excitation of another target electron is also observed. In contrast to the pure capture, the total cross section for this two-electron transition decreases with increasing collision energy, and its angular-differential cross section exhibits a much slighter slope. We take these observations as evidence for electron capture mediated by electron-electron interactions.
Fluctuations And Correlations Of Transmission Eigenchannels In Diffusive Media, Nicholas Bender, Alexey Yamilov, Hasan Yllmaz, Hui Cao
Fluctuations And Correlations Of Transmission Eigenchannels In Diffusive Media, Nicholas Bender, Alexey Yamilov, Hasan Yllmaz, Hui Cao
Physics Faculty Research & Creative Works
Selective excitation of a diffusive system's transmission eigenchannels enables manipulation of its internal energy distribution. The fluctuations and correlations of the eigenchannel's spatial profiles, however, remain unexplored so far. Here we show that the depth profiles of high-transmission eigenchannels exhibit low realization-to-realization fluctuations. Furthermore, our experimental and numerical studies reveal the existence of interchannel correlations, which are significant for low-transmission eigenchannels. Because high-transmission eigenchannels are robust and independent from other eigenchannels, they can reliably deliver energy deep inside turbid media.
Ejected-Electron-Energy And Angular Dependence Of Fully Differential Ionization Cross Sections In Medium-Velocity Proton Collisions With He And H₂, M. Dhital, S. Bastola, A. Silvus, J. Davis, B. R. Lamichhane, E. Ali, M. F. Ciappina, R. Lomsadze, A. Hasan, Don H. Madison, Michael Schulz
Ejected-Electron-Energy And Angular Dependence Of Fully Differential Ionization Cross Sections In Medium-Velocity Proton Collisions With He And H₂, M. Dhital, S. Bastola, A. Silvus, J. Davis, B. R. Lamichhane, E. Ali, M. F. Ciappina, R. Lomsadze, A. Hasan, Don H. Madison, Michael Schulz
Physics Faculty Research & Creative Works
We have measured fully momentum-analyzed recoiling target ions and scattered projectiles, produced in ionization of He and H2 by 75 keV proton impact, in coincidence. The momentum of the ejected electrons was deduced from momentum conservation. From the data we extracted fully differential ionization cross sections as a function of the polar electron emission angle (for fixed electron energies) and as a function of the electron energy (for fixed electron emission angles). Comparison between experiment and various distorted wave calculations confirms that under kinematic conditions where the post-collision interaction plays an important role, the few-body dynamics underlying the ionization …
Pump-Probe Spectroscopy Of Bose Polarons: Dynamical Formation And Coherence, Simeon I. Mistakidis, Garyfallia Katsimiga, G. M. Koutentakis, Th Busch, P. Schmelcher
Pump-Probe Spectroscopy Of Bose Polarons: Dynamical Formation And Coherence, Simeon I. Mistakidis, Garyfallia Katsimiga, G. M. Koutentakis, Th Busch, P. Schmelcher
Physics Faculty Research & Creative Works
We Propose And Investigate A Pump-Probe Spectroscopy Scheme To Unveil The Time-Resolved Dynamics Of Fermionic Or Bosonic Impurities Immersed In A Harmonically Trapped Bose-Einstein Condensate. In This Scheme A Pump Pulse Initially Transfers The Impurities From A Noninteracting To A Resonantly Interacting Spin State And, After A Finite Time In Which The System Evolves Freely, The Probe Pulse Reverses This Transition. This Directly Allows Us To Monitor The Nonequilibrium Dynamics Of The Impurities As The Dynamical Formation Of Coherent Attractive Or Repulsive Bose Polarons And Signatures Of Their Induced Interactions Are Imprinted In The Probe Spectra. We Show That For …
Reflected Fractional Brownian Motion In One And Higher Dimensions, Thomas Vojta, Samuel Halladay, Sarah Skinner, Skirmantas Janusonis, Tobias Guggenberger, Ralf Metzler
Reflected Fractional Brownian Motion In One And Higher Dimensions, Thomas Vojta, Samuel Halladay, Sarah Skinner, Skirmantas Janusonis, Tobias Guggenberger, Ralf Metzler
Physics Faculty Research & Creative Works
Fractional Brownian motion (FBM), a non-Markovian self-similar Gaussian stochastic process with long-ranged correlations, represents a widely applied, paradigmatic mathematical model of anomalous diffusion. We report the results of large-scale computer simulations of FBM in one, two, and three dimensions in the presence of reflecting boundaries that confine the motion to finite regions in space. Generalizing earlier results for finite and semi-infinite one-dimensional intervals, we observe that the interplay between the long-time correlations of FBM and the reflecting boundaries leads to striking deviations of the stationary probability density from the uniform density found for normal diffusion. Particles accumulate at the boundaries …
Parametrically Excited Star-Shaped Patterns At The Interface Of Binary Bose-Einstein Condensates, D. K. Maity, K. Mukherjee, Simeon I. Mistakidis, S. Das, P. G. Kevrekidis, S. Majumder, P. Schmelcher
Parametrically Excited Star-Shaped Patterns At The Interface Of Binary Bose-Einstein Condensates, D. K. Maity, K. Mukherjee, Simeon I. Mistakidis, S. Das, P. G. Kevrekidis, S. Majumder, P. Schmelcher
Physics Faculty Research & Creative Works
A Faraday-Wave-Like Parametric Instability Is Investigated Via Mean-Field And Floquet Analysis In Immiscible Binary Bose-Einstein Condensates. The Condensates Form A So-Called Ball-Shell Structure In A Two-Dimensional Harmonic Trap. To Trigger The Dynamics, The Scattering Length Of The Core Condensate Is Periodically Modulated In Time. We Reveal That In The Dynamics The Interface Becomes Unstable Towards The Formation Of Oscillating Patterns. The Interface Oscillates Subharmonically, Exhibiting An M-Fold Rotational Symmetry That Can Be Controlled By Maneuvering The Amplitude And The Frequency Of The Modulation. Using Floquet Analysis We Are Able To Predict The Generated Interfacial Tension Of The Mixture And Derive …
Gw190412: Observation Of A Binary-Black-Hole Coalescence With Asymmetric Masses, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Gw190412: Observation Of A Binary-Black-Hole Coalescence With Asymmetric Masses, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We report the observation of gravitational waves from a binary-black-hole coalescence during the first two weeks of LIGO's and Virgo's third observing run. The signal was recorded on April 12, 2019 at 05:30:44 UTC with a network signal-to-noise ratio of 19. The binary is different from observations during the first two observing runs most notably due to its asymmetric masses: a ∼30 Mʘ black hole merged with a ∼8 Mʘ black hole companion. The more massive black hole rotated with a dimensionless spin magnitude between 0.22 and 0.60 (90% probability). Asymmetric systems are predicted to emit gravitational waves …
Factorization Of High-Order-Harmonic-Generation Yields In Impurity-Doped Materials, Van Hung Hoang, Anh-Thu Le
Factorization Of High-Order-Harmonic-Generation Yields In Impurity-Doped Materials, Van Hung Hoang, Anh-Thu Le
Physics Faculty Research & Creative Works
We present a theoretical investigation of high-order-harmonic generation (HHG) from impurity-doped materials. Based on the analysis of the exact numerical solutions of the time-dependent Schrödinger equation (TDSE) for one-dimensional models, we demonstrate the factorization of HHG yields as a product of an electron wave packet and the recombination cross section, in analogy to HHG from atoms and molecules in the gas phase. Furthermore, we show that the quantitative rescattering model based on this factorization accurately reproduces the TDSE results. This opens up new possibilities to study impurities in materials using the available techniques from strong-field physics.
Doping A Lattice-Trapped Bosonic Species With Impurities: From Ground State Properties To Correlated Tunneling Dynamics, Kevin Keiler, Simeon I. Mistakidis, Peter Schmelcher
Doping A Lattice-Trapped Bosonic Species With Impurities: From Ground State Properties To Correlated Tunneling Dynamics, Kevin Keiler, Simeon I. Mistakidis, Peter Schmelcher
Physics Faculty Research & Creative Works
We Investigate The Ground State Properties And The Nonequilibrium Dynamics Of A Lattice Trapped Bosonic Mixture Consisting Of An Impurity Species And A Finite-Sized Medium. For The Case Of One As Well As Two Impurities We Observe That, Depending On The Lattice Depth And The Interspecies Interaction Strength, A Transition From A Strongly Delocalized To A Localized Impurity Distribution Occurs. In The Latter Regime The Two Species Phase Separate, Thereby Forming A Particle-Hole Pair. For Two Impurities We Find That Below A Critical Lattice Depth They Are Delocalized Among Two Neighboring Outer Lattice Wells And Are Two-Body Correlated. This Transition …
Observation And Analysis Of Multiple Dark-Antidark Solitons In Two-Component Bose-Einstein Condensates, Garyfallia Katsimiga, Simeon I. Mistakidis, T. M. Bersano, M. K.H. Ome, S. M. Mossman, K. Mukherjee, P. Schmelcher, P. Engels, P. G. Kevrekidis
Observation And Analysis Of Multiple Dark-Antidark Solitons In Two-Component Bose-Einstein Condensates, Garyfallia Katsimiga, Simeon I. Mistakidis, T. M. Bersano, M. K.H. Ome, S. M. Mossman, K. Mukherjee, P. Schmelcher, P. Engels, P. G. Kevrekidis
Physics Faculty Research & Creative Works
We Report On The Static And Dynamical Properties Of Multiple Dark-Antidark Solitons (DADs) In Two-Component, Repulsively Interacting Bose-Einstein Condensates. Motivated By Experimental Observations Involving Multiple DADs, We Present A Theoretical Study Which Showcases That Bound States Consisting Of Dark (Antidark) Solitons In The First (Second) Component Of The Mixture Exist For Different Values Of Interspecies Interactions. It Is Found That Ensembles Of Few DADs May Exist As Stable Configurations, While For Larger DAD Arrays, The Relevant Windows Of Stability With Respect To The Interspecies Interaction Strength Become Progressively Narrower. Moreover, The Dynamical Formation Of States Consisting Of Alternating DADs In …
Robust Control Of The Minima Of High-Order Harmonics By Fine-Tuning The Alignment Of Co₂ Molecules For Shaping Attosecond Pulses And Probing Molecular Alignment, Cheng Jin, Su Ju Wang, Song Feng Zhao, Anh-Thu Le, C. D. Lin
Robust Control Of The Minima Of High-Order Harmonics By Fine-Tuning The Alignment Of Co₂ Molecules For Shaping Attosecond Pulses And Probing Molecular Alignment, Cheng Jin, Su Ju Wang, Song Feng Zhao, Anh-Thu Le, C. D. Lin
Physics Faculty Research & Creative Works
In a recent paper [C. Jin, S.-J. Wang, X. Zhao, S.-F. Zhao, and C. D. Lin, Phys. Rev. A 101, 013429 (2020)2469-992610.1103/PhysRevA.101.013429], we reported that the position and depth of the minima in the harmonic spectra of CO2 molecules can be dramatically manipulated by a slight change of the degree of alignment, thus providing a convenient method of shaping attosecond pulses which could lead to the splitting of a typical single attosecond burst into two. Here, we demonstrate that harmonic minima can also be dramatically controlled by changing the pump-probe angles to shape attosecond pulses. In the meanwhile, since …
Collective Modes At A Disordered Quantum Phase Transition, Martin Puschmann, Jack Crewse, Jose A. Hoyos, Thomas Vojta
Collective Modes At A Disordered Quantum Phase Transition, Martin Puschmann, Jack Crewse, Jose A. Hoyos, Thomas Vojta
Physics Faculty Research & Creative Works
We study the collective excitations, i.e., the Goldstone (phase) mode and the Higgs (amplitude) mode, near the superfluid-Mott glass quantum phase transition in a two-dimensional system of disordered bosons. Using Monte Carlo simulations as well as an inhomogeneous quantum mean-field theory with Gaussian fluctuations, we show that the Higgs mode is strongly localized for all energies, leading to a noncritical scalar response. In contrast, the lowest-energy Goldstone mode undergoes a striking delocalization transition as the system enters the superfluid phase. We discuss the generality of these findings and experimental consequences, and we point out potential relations to many-body localization.
Many-Body Effects On Second-Order Phase Transitions In Spinor Bose-Einstein Condensates And Breathing Dynamics, K. M. Mittal, Simeon I. Mistakidis, P. G. Kevrekidis, P. Schmelcher
Many-Body Effects On Second-Order Phase Transitions In Spinor Bose-Einstein Condensates And Breathing Dynamics, K. M. Mittal, Simeon I. Mistakidis, P. G. Kevrekidis, P. Schmelcher
Physics Faculty Research & Creative Works
We Unravel The Correlation Effects Of The Second-Order Quantum Phase Transitions Emerging On The Ground State Of A Harmonically Trapped Spin-1 Bose Gas, Upon Varying The Involved Zeeman Terms, As Well As Its Breathing Dynamics Triggered By Quenching The Trapping Frequency. It Is Found That The Boundaries Of The Associated Magnetic Phases Are Altered In The Presence Of Interparticle Correlations For Both Ferromagnetic And Antiferromagnetic Spin-Spin Interactions, An Effect Which Becomes More Prominent In The Few-Body Scenario. Most Importantly, We Unveil A Correlation-Induced Shrinking Of The Antiferromagnetic And Broken-Axisymmetry Phases Implying That Ground States With Bosons Polarized In A Single …
Stationary And Dynamical Properties Of Two Harmonically Trapped Bosons In The Crossover From Two Dimensions To One, G. Bougas, Simeon I. Mistakidis, G. M. Alshalan, P. Schmelcher
Stationary And Dynamical Properties Of Two Harmonically Trapped Bosons In The Crossover From Two Dimensions To One, G. Bougas, Simeon I. Mistakidis, G. M. Alshalan, P. Schmelcher
Physics Faculty Research & Creative Works
We Unravel The Stationary Properties And The Interaction Quench Dynamics Of Two Bosons, Confined In A Two-Dimensional Anisotropic Harmonic Trap. A Transcendental Equation Is Derived Giving Access To The Energy Spectrum And Revealing The Dependence Of The Energy Gaps On The Anisotropy Parameter. The Relation Between The Two- And One-Dimensional Scattering Lengths As Well As The Tan Contacts Is Established. The Contact, Capturing The Two-Body Short-Range Correlations, Shows An Increasing Tendency For A Larger Anisotropy. Subsequently, The Interaction Quench Dynamics From Attractive To Repulsive Values And Vice Versa Is Investigated For Various Anisotropies. A Closed Analytical Form Of The Expansion …
Serotonergic Axons As Fractional Brownian Motion Paths: Insights Into The Self-Organization Of Regional Densities, Skirmantas Janusonis, Nils Detering, Ralf Metzler, Thomas Vojta
Serotonergic Axons As Fractional Brownian Motion Paths: Insights Into The Self-Organization Of Regional Densities, Skirmantas Janusonis, Nils Detering, Ralf Metzler, Thomas Vojta
Physics Faculty Research & Creative Works
All vertebrate brains contain a dense matrix of thin fibers that release serotonin (5-hydroxytryptamine), a neurotransmitter that modulates a wide range of neural, glial, and vascular processes. Perturbations in the density of this matrix have been associated with a number of mental disorders, including autism and depression, but its self-organization and plasticity remain poorly understood. We introduce a model based on reflected Fractional Brownian Motion (FBM), a rigorously defined stochastic process, and show that it recapitulates some key features of regional serotonergic fiber densities. Specifically, we use supercomputing simulations to model fibers as FBM-paths in two-dimensional brain-like domains and demonstrate …
Z₃-Vestigial Nematic Order Due To Superconducting Fluctuations In The Doped Topological Insulators Nbₓbi₂Se₃ And Cuₓbi₂Se₃, Chang Woo Cho, Junying Shen, Jian Lyu, Omargeldi Atanov, Qianxue Chen, Seng Huat Lee, Yew San Hor, For Full List Of Authors, See Publisher's Website.
Z₃-Vestigial Nematic Order Due To Superconducting Fluctuations In The Doped Topological Insulators Nbₓbi₂Se₃ And Cuₓbi₂Se₃, Chang Woo Cho, Junying Shen, Jian Lyu, Omargeldi Atanov, Qianxue Chen, Seng Huat Lee, Yew San Hor, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
A state of matter with a multi-component order parameter can give rise to vestigial order. In the vestigial phase, the primary order is only partially melted, leaving a remaining symmetry breaking behind, an effect driven by strong classical or quantum fluctuations. Vestigial states due to primary spin and charge-density-wave order have been discussed in iron-based and cuprate materials. Here we present the observation of a partially melted superconductivity in which pairing fluctuations condense at a separate phase transition and form a nematic state with broken Z3, i.e., three-state Potts-model symmetry. Thermal expansion, specific heat and magnetization measurements of …
Two-Loop Corrections To The Large-Order Behavior Of Correlation Functions In The One-Dimensional N-Vector Model, L. T. Giorgini, Ulrich D. Jentschura, E. M. Malatesta, G. Parisi, T. Rizzo, J. Zinn-Justin
Two-Loop Corrections To The Large-Order Behavior Of Correlation Functions In The One-Dimensional N-Vector Model, L. T. Giorgini, Ulrich D. Jentschura, E. M. Malatesta, G. Parisi, T. Rizzo, J. Zinn-Justin
Physics Faculty Research & Creative Works
For a long time, the predictive limits of perturbative quantum field theory have been limited by our inability to carry out loop calculations to an arbitrarily high order, which become increasingly complex as the order of perturbation theory is increased. This problem is exacerbated by the fact that perturbation series derived from loop diagram (Feynman diagram) calculations represent asymptotic (divergent) series which limits the predictive power of perturbative quantum field theory. Here, we discuss an ansatz that could overcome these limits, based on the observations that (i) for many phenomenologically relevant field theories, one can derive dispersion relations which relate …
Fifth Force And Hyperfine Splitting In Bound Systems, Ulrich D. Jentschura
Fifth Force And Hyperfine Splitting In Bound Systems, Ulrich D. Jentschura
Physics Faculty Research & Creative Works
Two recent experimental observations at the ATOMKI Institute of the Hungarian Academy of Sciences (regarding the angular emission pattern of electron-positron pairs from nuclear transitions from excited states in 8Be and 4He) indicate the possible existence of a particle of a rest mass energy of roughly 17 MeV. The so-called X17 particle constitutes a virtual state in the process, preceding the emission of the electron-positron pair. Based on the symmetry of the nuclear transitions (1+ → 0+ and 0- →0 +), the X17 could either be a vector, or a pseudoscalar particle. Here, we …
Interplay Of Phase Separation And Itinerant Magnetism For Correlated Few Fermions In A Double-Well, G. M. Koutentakis, Simeon I. Mistakidis, P. Schmelcher
Interplay Of Phase Separation And Itinerant Magnetism For Correlated Few Fermions In A Double-Well, G. M. Koutentakis, Simeon I. Mistakidis, P. Schmelcher
Physics Faculty Research & Creative Works
We Explore The Stability Of The Phase Separation Phenomenon In Few-Fermion Spin-1/2 Systems Confined In A Double-Well Potential. It Is Shown That Within The SU(2) Symmetric Case, Where The Total Spin Is Conserved, The Phase Separation Cannot Be Fully Stabilized. An Interaction Regime Characterized By Metastable Phase Separation Emerges For Intermediate Interactions Which Is Inherently Related With Ferromagnetic Spin-Spin Correlations Emerging Within Each Of The Wells. The Breaking Of The SU(2) Symmetry Crucially Affects The Stability Properties Of The System As The Phase Separated State Can Be Stabilized Even For Weak Magnetic Potential Gradients. Our Results Imply An Intricate Relation …
Induced Correlations Between Impurities In A One-Dimensional Quenched Bose Gas, Simeon I. Mistakidis, A. G. Volosniev, P. Schmelcher
Induced Correlations Between Impurities In A One-Dimensional Quenched Bose Gas, Simeon I. Mistakidis, A. G. Volosniev, P. Schmelcher
Physics Faculty Research & Creative Works
We Explore The Time Evolution Of Two Impurities In A Trapped One-Dimensional Bose Gas That Follows A Change Of The Boson-Impurity Interaction. We Study The Induced Impurity-Impurity Interactions And Their Effect On The Quench Dynamics. In Particular, We Report On The Size Of The Impurity Cloud, The Impurity-Impurity Entanglement, And The Impurity-Impurity Correlation Function. The Presented Numerical Simulations Are Based Upon The Variational Multilayer Multiconfiguration Time-Dependent Hartree Method For Bosons. To Analyze And Quantify Induced Impurity-Impurity Correlations, We Employ An Effective Two-Body Hamiltonian With A Contact Interaction. We Show That The Effective Model Consistent With The Mean-Field Attraction Of Two …
Origin Of High Carrier Concentration In Amorphous Wide-Bandgap Oxides: Role Of Disorder In Defect Formation And Electron Localization In In₂O₃₋ₓ, Julia E. Medvedeva, I. A. Zhuravlev, C. Burris, D. B. Buchholz, M. Grayson, R. P. H. Chang
Origin Of High Carrier Concentration In Amorphous Wide-Bandgap Oxides: Role Of Disorder In Defect Formation And Electron Localization In In₂O₃₋ₓ, Julia E. Medvedeva, I. A. Zhuravlev, C. Burris, D. B. Buchholz, M. Grayson, R. P. H. Chang
Physics Faculty Research & Creative Works
Structural disorder has been known to suppress carrier concentration and carrier mobility in common covalent semiconductors, such as silicon, by orders of magnitude. This is expected from a reduced overlap of the electron clouds on neighboring orbitals and the formation of localized tail states near the band edges caused by local distortions and lack of periodicity in the amorphous phase. In striking contrast to the covalent semiconductors, wide-bandgap oxides of post-transition metals with ionic bonding not only allow for crystalline-like electron mobility upon amorphization, but also exhibit two orders of magnitude higher carrier concentration in the disordered phase as compared …
Correlated Dynamics Of Fermionic Impurities Induced By The Counterflow Of An Ensemble Of Fermions, J. Kwasniok, Simeon I. Mistakidis, P. Schmelcher
Correlated Dynamics Of Fermionic Impurities Induced By The Counterflow Of An Ensemble Of Fermions, J. Kwasniok, Simeon I. Mistakidis, P. Schmelcher
Physics Faculty Research & Creative Works
We Investigate The Nonequilibrium Quantum Dynamics Of One And Two Heavy Fermionic Impurities Being Harmonically Trapped And Repulsively Interacting With A Finite Ensemble Of Majority Fermions. A Quench Of The Potential Of The Majority Species From A Double-Well To A Harmonic Trap Is Applied, Enforcing Its Counterflow, Which In Turn Perturbs The Impurities. For Weak Repulsions, It Is Shown That The Mixture Undergoes A Periodic Mixing And Demixing Dynamics, While Stronger Interactions Lead To A More Pronounced Dynamical Spatial Separation. In The Presence Of Correlations, The Impurity Exhibits An Expansion Dynamics Which Is Absent In The Hartree-Fock Case, Resulting In …
Enhancement And Reentrance Of Spin Triplet Superconductivity In Ute₂ Under Pressure, Sheng Ran, Hyunsoo Kim, I. Lin Liu, Shanta R. Saha, Ian Hayes, Tristin Metz, Yun Suk Eo, Johnpierre Paglione, Nicholas P. Butch
Enhancement And Reentrance Of Spin Triplet Superconductivity In Ute₂ Under Pressure, Sheng Ran, Hyunsoo Kim, I. Lin Liu, Shanta R. Saha, Ian Hayes, Tristin Metz, Yun Suk Eo, Johnpierre Paglione, Nicholas P. Butch
Physics Faculty Research & Creative Works
Spin triplet superconductivity in the Kondo lattice UTe2 appears to be associated with spin fluctuations originating from incipient ferromagnetic order. Here we show clear evidence of twofold enhancement of superconductivity under pressure, which discontinuously transitions to magnetic order, likely of ferromagnetic nature, at higher pressures. The application of a magnetic field tunes the system back across a first-order phase boundary. Straddling this phase boundary, we find another example of reentrant superconductivity in UTe2. As the superconductivity and magnetism exist on two opposite sides of the first-order phase boundary, our results indicate other microscopic mechanisms may be playing …
Many-Body Quantum Dynamics And Induced Correlations Of Bose Polarons, Simeon I. Mistakidis, G. M. Koutentakis, Garyfallia Katsimiga, Th Busch, P. Schmelcher
Many-Body Quantum Dynamics And Induced Correlations Of Bose Polarons, Simeon I. Mistakidis, G. M. Koutentakis, Garyfallia Katsimiga, Th Busch, P. Schmelcher
Physics Faculty Research & Creative Works
We Study The Ground State Properties And Non-Equilibrium Dynamics Of Two Spinor Bosonic Impurities Immersed In A One-Dimensional Bosonic Gas Upon Applying An Interspecies Interaction Quench. For The Ground State Of Two Non-Interacting Impurities We Reveal Signatures Of Attractive Induced Interactions In Both Cases Of Attractive Or Repulsive Interspecies Interactions, While A Weak Impurity-Impurity Repulsion Forces The Impurities To Stay Apart. Turning To The Quench Dynamics We Inspect The Time-Evolution Of The Contrast Unveiling The Existence, Dynamical Deformation And The Orthogonality Catastrophe Of Bose Polarons. We Find That For An Increasing Postquench Repulsion The Impurities Reside In A Superposition Of …
Quantum Interference Of K Capture In Energetic G E31+(1s)-Kr Collisions, R. Schuch, Michael Schulz, For Full List Of Authors, See Publisher's Website.
Quantum Interference Of K Capture In Energetic G E31+(1s)-Kr Collisions, R. Schuch, Michael Schulz, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We have measured characteristic K x rays in coincidence with the scattered particles from collisions of hydrogenlike Ge ions with Kr atoms. The ions were first accelerated to 8.6 MeV/amu, post-stripped to H-like charge state, and decelerated to around 2.5 MeV/amu. From the measurements the probabilities for K-shell to K-shell charge transfer as a function of collision impact parameters were obtained. The probabilities show an onset of oscillations which are interpreted as quantum interference between the K-shell to K-shell electron transfer amplitudes in two spatially separated coupling regions in the incoming and outgoing parts of the collision. The probabilities of …
Differential Study Of Projectile Coherence Effects On Double Capture Processes In P + Ar Collisions, Trevor Voss, Basu R. Lamichhane, Madhav Dhital, Ramaz Lomsadze, Michael Schulz
Differential Study Of Projectile Coherence Effects On Double Capture Processes In P + Ar Collisions, Trevor Voss, Basu R. Lamichhane, Madhav Dhital, Ramaz Lomsadze, Michael Schulz
Physics Faculty Research & Creative Works
We have measured differential yields for double capture and double capture accompanied by ionization in 75 keV p + Ar collisions. Data were taken for two different transverse projectile coherence lengths. A small effect of the projectile coherence properties on the yields were found for double capture, but not for double capture plus ionization. The results suggest that multiple projectile-target interactions can lead to a significant weakening of projectile coherence effects.