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Articles 1  30 of 551
FullText Articles in Physics
Benchmarks Of Nonclassicality For Qubit Arrays, Mordecai Waegell, Justin Dressel
Benchmarks Of Nonclassicality For Qubit Arrays, Mordecai Waegell, Justin Dressel
Mathematics, Physics, and Computer Science Faculty Articles and Research
We present a set of practical benchmarks for Nqubit arrays that economically test the fidelity of achieving multiqubit nonclassicality. The benchmarks are measurable correlators similar to twoqubit Bell correlators, and are derived from a particular set of geometric structures from the Nqubit Pauli group. These structures prove the Greenberger–Horne–Zeilinger (GHZ) theorem, while the derived correlators witness genuine Npartite entanglement and establish a tight lower bound on the fidelity of particular stabilizer state preparations. The correlators need only M ≤ N + 1 distinct measurement settings, as opposed to the 2^{2N} − 1 settings that would normally be required ...
Stereodynamical Control Of A Quantum Scattering Resonance In Cold Molecular Collisions, Pablo G. Jambrina, James F.E. Croft, Hua Guo, Mark Brouard, Balakrishnan Naduvalath, F. Javier Aoiz
Stereodynamical Control Of A Quantum Scattering Resonance In Cold Molecular Collisions, Pablo G. Jambrina, James F.E. Croft, Hua Guo, Mark Brouard, Balakrishnan Naduvalath, F. Javier Aoiz
Chemistry and Biochemistry Faculty Publications
Cold collisions of light molecules are often dominated by a single partial wave resonance. For the rotational quenching of HD (v=1, j=2) by collisions with ground state paraH2, the process is dominated by a single L=2 partial wave resonance centered around 0.1 K. Here, we show that this resonance can be switched on or off simply by appropriate alignment of the HD rotational angular momentum relative to the initial velocity vector, thereby enabling complete control of the collision outcome.
Topological Nodal Line Semimetals In Graphene Network Structures, JianTao Wang, Hongming Weng, Chengfeng Chen
Topological Nodal Line Semimetals In Graphene Network Structures, JianTao Wang, Hongming Weng, Chengfeng Chen
Physics & Astronomy Faculty Publications
Topological semimetals are a fascinating class of quantum materials that possess extraordinary electronic and transport properties. These materials have attracted great interests in recent years for their fundamental significance and potential device applications. There have been intensive studies suggested that threedimensional graphene networks support topological semimetals with two types of continuous nodal lines: one is to form closed nodal rings in Brillouin zone and the other ones traversing the whole Brillouin zone to be periodically connected. Carbon has negligible spinorbit coupling, nonmagnetism and great diversity of allotropes, which makes it very promising in realizing topological nodal line semimetals. Here we ...
Laser Cooling With Adiabatic Transfer On A Raman Transition, Graham Greve, Baochen Wu, James K. Thompson
Laser Cooling With Adiabatic Transfer On A Raman Transition, Graham Greve, Baochen Wu, James K. Thompson
JILA Faculty Contributions
Sawtooth Wave Adiabatic Passage (SWAP) laser cooling was recently demonstrated using a narrowlinewidth singlephoton optical transition in atomic strontium and may prove useful for cooling other atoms and molecules. However, many atoms and molecules lack the appropriate narrow optical transition. Here we use such an atom, ^{87}Rb, to demonstrate that twophoton Raman transitions with arbitrarilytunable linewidths can be used to achieve 1D SWAP cooling without significantly populating the intermediate excited state. Unlike SWAP cooling on a narrow transition, Raman SWAP cooling allows for a final 1D temperature well below the Doppler cooling limit (here, 25 times lower); and the ...
Experimental Evidence Supportive Of The Quantum Dna Model, F. Matthew Mihelic
Experimental Evidence Supportive Of The Quantum Dna Model, F. Matthew Mihelic
Faculty Publications
The DNA molecule can be modeled as a quantum logic processor in which electron spin qubits are held coherently in each nucleotide in a logically and thermodynamically reversible enantiomeric symmetry, and can be coherently conducted along the pistacking interactions of aromatic nucleotide bases, while simultaneously being spinfiltered via the helicity of the DNA molecule. Entangled electron pairs can be separated by that spinfiltering, held coherently at biological temperatures in the topologically insulated nucleotide quantum gates, and incorporated into separate DNA strands during DNA replication. Two separate DNA strands that share quantum entangled electrons can be mitotically divided into individual cells ...
Unbounded Derivations Of C*Algebras And The Heisenberg Commutation Relation, Lara M. Ismert
Unbounded Derivations Of C*Algebras And The Heisenberg Commutation Relation, Lara M. Ismert
Dissertations, Theses, and Student Research Papers in Mathematics
This dissertation investigates the properties of unbounded derivations on C*algebras, namely the density of their analytic vectors and a property we refer to as "kernel stabilization." We focus on a weaklydefined derivation δ_{D} which formalizes commutators involving unbounded selfadjoint operators on a Hilbert space. These commutators naturally arise in quantum mechanics, as we briefly describe in the introduction.
A first application of kernel stabilization for δ_{D} shows that a large class of abstract derivations on unbounded C*algebras, defined by O. Bratteli and D. Robinson, also have kernel stabilization. A second application of kernel stabilization provides a ...
Free Electron Sources And Diffraction In Time, Eric R. Jones
Free Electron Sources And Diffraction In Time, Eric R. Jones
Theses, Dissertations, and Student Research: Department of Physics and Astronomy
The quantum revolution of the last century advanced synergistically with technology, for example, with control of the temporal and spatial coherence, and the polarization state of light. Indeed, experimental confirmation of the quirks of quantum theory, as originally highlighted by Einstein, Podolsky, and Rosen, through Bohm, and then Bell, have been performed with photons, i.e., electromagnetic wave packets prepared in the same quantum states. Experimental tests of quantum mechanics with matter wave packets have been limited due to challenges in preparing all of the packets with similar quantum states. While great strides have been made for trapped atoms and ...
The Nature Of The HeisenbergVon Neumann Cut: Enhanced Orthodox Interpretation Of Quantum Mechanics, Ashok Narasimhan, Deepak Chopra, Menas Kafatos
The Nature Of The HeisenbergVon Neumann Cut: Enhanced Orthodox Interpretation Of Quantum Mechanics, Ashok Narasimhan, Deepak Chopra, Menas Kafatos
Mathematics, Physics, and Computer Science Faculty Articles and Research
We examine the issue of the Heisenbergvon Neumann cut in light of recent interpretations of quantum eraser experiments which indicate the possibility of a universal Observer outside spacetime at an information level of existence. The delayedchoice aspects of observation, measurement, the role of the observer, and information in the quantum framework of the universe are discussed. While traditional doubleslit experiments are usually interpreted as indicating that the collapse of the wave function involves choices by an individual observer in spacetime, the extension to quantum eraser experiments brings in some additional subtle aspects relating to the role of observation and what ...
Roadmap On Superoscillations, Michael Berry, Nicolay Zheludev, Yakir Aharonov, Fabrizio Colombo, Irene Sabadini, Daniele C. Struppa, Jeff Tollaksen, Edward T. F. Rogers, Fei Qin, Minghui Hong, Xiangang Luo, Roei Remez, Ady Arie, Jörg B. Götte, Mark R. Dennis, Alex M. H. Wong, George V. Eleftheriades, Yaniv Eliezer, Alon Bahabad, Gang Chen, Zhongquan Wen, Gaofeng Liang, Chenglong Hao, CW Qiu, Achim Kempf, Eytan Katzav, Moshe Schwartz
Roadmap On Superoscillations, Michael Berry, Nicolay Zheludev, Yakir Aharonov, Fabrizio Colombo, Irene Sabadini, Daniele C. Struppa, Jeff Tollaksen, Edward T. F. Rogers, Fei Qin, Minghui Hong, Xiangang Luo, Roei Remez, Ady Arie, Jörg B. Götte, Mark R. Dennis, Alex M. H. Wong, George V. Eleftheriades, Yaniv Eliezer, Alon Bahabad, Gang Chen, Zhongquan Wen, Gaofeng Liang, Chenglong Hao, CW Qiu, Achim Kempf, Eytan Katzav, Moshe Schwartz
Mathematics, Physics, and Computer Science Faculty Articles and Research
Superoscillations are bandlimited functions with the counterintuitive property that they can vary arbitrarily faster than their fastest Fourier component, over arbitrarily long intervals. Modern studies originated in quantum theory, but there were anticipations in radar and optics. The mathematical understanding—still being explored—recognises that functions are extremely small where they superoscillate; this has implications for information theory. Applications to optical vortices, subwavelength microscopy and related areas of nanoscience are now moving from the theoretical and the demonstrative to the practical. This Roadmap surveys all these areas, providing background, current research, and anticipating future developments.
Testing Quantum Coherence In Stochastic Electrodynamics With Squeezed Schrödinger Cat States, Wayne ChengWei Huang, Herman Batelaan
Testing Quantum Coherence In Stochastic Electrodynamics With Squeezed Schrödinger Cat States, Wayne ChengWei Huang, Herman Batelaan
Faculty Publications, Department of Physics and Astronomy
The interference pattern in electron doubleslit diffraction is a hallmark of quantum mechanics. A longstanding question for stochastic electrodynamics (SED) is whether or not it is capable of reproducing such effects, as interference is a manifestation of quantum coherence. In this study, we used excited harmonic oscillators to directly test this quantum feature in SED. We used two counterpropagating dichromatic laser pulses to promote a groundstate harmonic oscillator to a squeezed Schrödinger cat state. Upon recombination of the two wellseparated wavepackets, an interference pattern emerges in the quantum probability distribution but is absent in the SED probability distribution. We thus ...
Kondo Signatures Of A Quantum Magnetic Impurity In Topological Superconductors, Rui Wang, WeiYi Su, JianXin Zhu, ChinSen Ting, Hai Li, Changfeng Chen, Baigeng Wang, Xiaoqun Wang
Kondo Signatures Of A Quantum Magnetic Impurity In Topological Superconductors, Rui Wang, WeiYi Su, JianXin Zhu, ChinSen Ting, Hai Li, Changfeng Chen, Baigeng Wang, Xiaoqun Wang
Physics & Astronomy Faculty Publications
We study the Kondo physics of a quantum magnetic impurity in twodimensional topological superconductors (TSCs), either intrinsic or induced on the surface of a bulk topological insulator, using a numerical renormalization group technique. We show that, despite sharing the p+ip pairing symmetry, intrinsic and extrinsic TSCs host different physical processes that produce distinct Kondo signatures. Extrinsic TSCs harbor an unusual screening mechanism involving both electron and orbital degrees of freedom that produces rich and prominent Kondo phenomena, especially an intriguing pseudospin Kondo singlet state in the superconducting gap and a spatially anisotropic spin correlation. In sharp contrast, intrinsic TSCs ...
Ultrafast Manipulation Of Topologically Enhanced Surface Transport Driven By MidInfrared And Terahertz Pulses In Bi2se3, Liang Luo, Xu Yang, X. Liu, Zhiyan Liu, Chirag Vaswani, Di Cheng, M. Mootz, Xin Zhao, Yongxin Yao, CaiZhuang Wang, KaiMing Ho, I. E. Perakis, M. Dobrowolska, J. K. Furdyna, Jigang Wang
Ultrafast Manipulation Of Topologically Enhanced Surface Transport Driven By MidInfrared And Terahertz Pulses In Bi2se3, Liang Luo, Xu Yang, X. Liu, Zhiyan Liu, Chirag Vaswani, Di Cheng, M. Mootz, Xin Zhao, Yongxin Yao, CaiZhuang Wang, KaiMing Ho, I. E. Perakis, M. Dobrowolska, J. K. Furdyna, Jigang Wang
Ames Laboratory Accepted Manuscripts
Topologyprotected surface transport of ultimate thinness in threedimensional topological insulators (TIs) is breaking new ground in quantum science and technology. Yet a challenge remains on how to disentangle and selectively control surface helical spin transport from the bulk contribution. Here we use the midinfrared and terahertz (THz) photoexcitation of exclusive intraband transitions to enable ultrafast manipulation of surface THz conductivity in Bi2Se3. The unique, transient electronic state is characterized by frequencydependent carrier relaxations that directly distinguish the faster surface channel than the bulk with no complication from interband excitations or need for reduced bulk doping. We determine the topological enhancement ...
OutOfTimeOrderedCorrelator Quasiprobabilities Robustly Witness Scrambling, José Raúl González Alonso, Nicole Yunger Halpern, Justin Dressel
OutOfTimeOrderedCorrelator Quasiprobabilities Robustly Witness Scrambling, José Raúl González Alonso, Nicole Yunger Halpern, Justin Dressel
Mathematics, Physics, and Computer Science Faculty Articles and Research
Outoftimeordered correlators (OTOCs) have received considerable recent attention as qualitative witnesses of information scrambling in manybody quantum systems. Theoretical discussions of OTOCs typically focus on closed systems, raising the question of their suitability as scrambling witnesses in realistic open systems. We demonstrate empirically that the nonclassical negativity of the quasiprobability distribution (QPD) behind the OTOC is a more sensitive witness for scrambling than the OTOC itself. Nonclassical features of the QPD evolve with timescales that are robust with respect to decoherence and are immune to false positives caused by decoherence. To reach this conclusion, we numerically simulate spinchain dynamics and ...
Peculiar Optical Properties Of Bilayer Silicene Under The Influence Of External Electric And Magnetic Fields, ThiNga Do, Godfrey Gumbs, PoHsin Shih, Danhong Huang, ChihWei Chiu, ChiaYun Chen, MingFa Lin
Peculiar Optical Properties Of Bilayer Silicene Under The Influence Of External Electric And Magnetic Fields, ThiNga Do, Godfrey Gumbs, PoHsin Shih, Danhong Huang, ChihWei Chiu, ChiaYun Chen, MingFa Lin
Publications and Research
We conduct a comprehensive investigation of the effect of an applied electric field on the optical and magnetooptical absorption spectra for ABbt (bottomtop) bilayer silicene. The generalized tightbinding model in conjunction with the Kubo formula is efficiently employed in the numerical calculations. The electronic and optical properties are greatly diversified by the buckled lattice structure, stacking configuration, intralayer and interlayer hopping interactions, spinorbital couplings, as well as the electric and magnetic fields (Ez ˆz & Bz ˆz ). An electric field induces spinsplit electronic states, a semiconductormetal phase transitions and the Dirac cone formations in different valleys, leading to the special absorption ...
Quadratic To Linear Magnetoresistance Tuning In Tmb4, Sreemanta Mitra, Jeremy Goh Swee Kang, John Shin, Jin Quan Ng, Sai Swaroop Sunku, Tai Kong, Paul C. Canfield, B. Sriram Shastry, Pinaki Sengupta, Christos Panagopoulos
Quadratic To Linear Magnetoresistance Tuning In Tmb4, Sreemanta Mitra, Jeremy Goh Swee Kang, John Shin, Jin Quan Ng, Sai Swaroop Sunku, Tai Kong, Paul C. Canfield, B. Sriram Shastry, Pinaki Sengupta, Christos Panagopoulos
Ames Laboratory Accepted Manuscripts
The change of a material's electrical resistance (R) in response to an external magnetic field (B) provides subtle information for the characterization of its electronic properties and has found applications in sensor and storage related technologies. In good metals, Boltzmann's theory predicts a quadratic growth in magnetoresistance (MR) at low B and saturation at high fields. On the other hand, a number of nonmagnetic materials with weak electronic correlation and low carrier concentration for metallicity, such as inhomogeneous conductors, semimetals, narrow gap semiconductors and topological insulators, and two dimensional electron gas, show positive, nonsaturating linear magnetoresistance (LMR). However ...
ThreeParticle Systems With Resonant Subprocesses In A Finite Volume, Raúl A. Briceño, Maxwell T. Hansen, Stephen R. Sharpe
ThreeParticle Systems With Resonant Subprocesses In A Finite Volume, Raúl A. Briceño, Maxwell T. Hansen, Stephen R. Sharpe
Physics Faculty Publications
In previous work, we have developed a relativistic, modelindependent threeparticle quantization condition, but only under the assumption that no poles are present in the twoparticle K matrices that appear as scattering subprocesses [M. T. Hansen and S. R. Sharpe, Phys. Rev. D 90, 116003 (2014); M. T. Hansen and S. R. Sharpe, Phys. Rev. D 92, 114509 (2015); R. A. Briceño et al., Phys. Rev. D 95, 074510 (2017).]. Here we lift this restriction, by deriving the quantization condition for identical scalar particles with a Gparity symmetry, in the case that the twoparticle K matrix has a pole in the ...
New Perspectives On The SchrödingerPauli Theory Of Electrons: Part I, Viraht Sahni
New Perspectives On The SchrödingerPauli Theory Of Electrons: Part I, Viraht Sahni
Publications and Research
SchrödingerPauli (SP) theory is a description of electrons in the presence of a static electromagnetic field in which the interaction of the magnetic field with both the orbital and spin moments is explicitly considered. The theory is described from the new perspective of the individual electron via its equation of motion or ‘Quantal Newtonian’ first law. The law is in terms of ‘classical’ fields whose sources are quantum mechanical expectation values of Hermitian operators taken with respect to the system wave function. The law states that each electron experiences an external and an internal field, the sum of which vanish ...
New Perspectives On The SchrödingerPauli Theory Of Electrons: Part Ii: Application To The Triplet State Of A Quantum Dot In A Magnetic Field, Marlina Slamet, Viraht Sahni
New Perspectives On The SchrödingerPauli Theory Of Electrons: Part Ii: Application To The Triplet State Of A Quantum Dot In A Magnetic Field, Marlina Slamet, Viraht Sahni
Publications and Research
The SchrödingerPauli (SP) theory of electrons in the presence of a static electromagnetic field can be described from the perspective of the individual electron via its equation of motion or 'Quantal Newtonian' first law. The law is in terms of 'classical' fields whose sources are quantummechanical expectation values of Hermitian operators taken with respect to the wave function. The law states that the sum of the external and internal fields experienced by each electron vanishes. The external field is the sum of the binding electrostatic and Lorentz fields. The internal field is the sum of fields representative of properties of ...
Polarized Hyperon Production In SingleInclusive Electron Positron Annihilation At NextToLeading Order, Leonard Gamberg, ZhongBo Kang, Daniel Pitonyak, Marc Schlegel, Shinsuke Yoshida
Polarized Hyperon Production In SingleInclusive Electron Positron Annihilation At NextToLeading Order, Leonard Gamberg, ZhongBo Kang, Daniel Pitonyak, Marc Schlegel, Shinsuke Yoshida
Physics Faculty Publications
We study the production of polarized Ahyperons in electronpositron annihilation. We are particularly interested in the transversespin dependence of the cross section for unpolarized incident electronpositron pairs. At high energies this process may be described in the collinear twist3 framework, where the hadronization transition of partons into a transversely polarized hyperon can be written in terms of collinear twist3 fragmentation matrix elements. We calculate the hard partonic cross sections and interference terms in perturbative QCD to nexttoleading order accuracy. We find that the QCD equation of motion plays a crucial role in our analysis. As a byproduct, assuming the validity ...
QuarkMass Dependence Of Elastic Πk Scattering From Qcd, David J. Wilson, Raúl A. Briceño, Jozef K. Dudek, Robert G. Edwards, Christopher E. Thomas
QuarkMass Dependence Of Elastic Πk Scattering From Qcd, David J. Wilson, Raúl A. Briceño, Jozef K. Dudek, Robert G. Edwards, Christopher E. Thomas
Physics Faculty Publications
We present a determination of the isospin1/2 elastic πK scattering amplitudes in S and P partial waves using lattice quantum chromodynamics. The amplitudes, constrained for a large number of realvalued energy points, are obtained as a function of lightquark mass, corresponding to four pion masses between 200 and 400 MeV, at a single lattice spacing. Below the first inelastic threshold, the Pwave scattering amplitude is dominated by a single pole singularity that evolves from being a stable bound state at the highest quark mass into a narrow resonance that broadens as the pion and kaon masses are reduced. As ...
Exploring The Structure Of The Bound Proton With Deeply Virtual Compton Scattering, M. Hattawy, N.A. Baltzell, R. Dupré, S. Bültmann, B. Torayev, G. Gavalian, F. Hauenstein, S. E. Kuhn, M. Khachatryan, M. Mayer, J. Poudel, Y. Prok, L. B. Weinstein, J. Zhang, Z. W. Zhao, Clas Collaboration
Exploring The Structure Of The Bound Proton With Deeply Virtual Compton Scattering, M. Hattawy, N.A. Baltzell, R. Dupré, S. Bültmann, B. Torayev, G. Gavalian, F. Hauenstein, S. E. Kuhn, M. Khachatryan, M. Mayer, J. Poudel, Y. Prok, L. B. Weinstein, J. Zhang, Z. W. Zhao, Clas Collaboration
Physics Faculty Publications
In the past two decades, deeply virtual Compton scattering of electrons has been successfully used to advance our knowledge of the partonic structure of the free proton and investigate correlations between the transverse position and the longitudinal momentum of quarks inside the nucleon. Meanwhile, the structure of bound nucleons in nuclei has been studied in inclusive deepinelastic lepton scattering experiments off nuclear targets, showing a significant difference in longitudinal momentum distribution of quarks inside the bound nucleon, known as the EMC effect. In this Letter, we report the first beam spin asymmetry (BSA) measurement of exclusive deeply virtual Compton scattering ...
Computational Techniques For Scattering Amplitudes, Juliano A. Everett
Computational Techniques For Scattering Amplitudes, Juliano A. Everett
Publications and Research
Scattering amplitudes in quantum field theory can be described as the probability of a scattering process to happen within a high energy particle interaction, as well as a bridge between experimental measurements and the prediction of the theory.
In this research project, we explore the Standard Model of Particle Theory, it’s representation in terms of Feynman diagrams and the algebraic formulas associated with each combination.
Using the FeynArts program as a tool for generating Feynman diagrams, we evaluate the expressions of a set of physical processes, and explain why these techniques become necessary to achieve this goal.
Improving The State Selectivity Of Field Ionization With Quantum Control, Vincent C. Gregoric, Jason Bennett, Bianca R. Gualtieri, Ankitha Kannad, Zhimin Cheryl Liu, Zoe A. Rowley, Thomas J. Carroll, Michael W. Noel
Improving The State Selectivity Of Field Ionization With Quantum Control, Vincent C. Gregoric, Jason Bennett, Bianca R. Gualtieri, Ankitha Kannad, Zhimin Cheryl Liu, Zoe A. Rowley, Thomas J. Carroll, Michael W. Noel
Physics and Astronomy Faculty Publications
The electron signals from the field ionization of two closely spaced Rydberg states of rubidium85 are separated using quantum control. In selective field ionization, the state distribution of a collection of Rydberg atoms is measured by ionizing the atoms with a ramped electric field. Generally, atoms in higher energy states ionize at lower fields, so ionized electrons which are detected earlier in time can be correlated with higher energy Rydberg states. However, the resolution of this technique is limited by the Stark effect. As the electric field is increased, the electron encounters numerous avoided Stark level crossings which split the ...
Chiral Cherenkov And Chiral Transition Radiation In Anisotropic Matter, Kirill Tuchin
Chiral Cherenkov And Chiral Transition Radiation In Anisotropic Matter, Kirill Tuchin
Physics and Astronomy Publications
A significant contribution to the electromagnetic radiation by a fast electric charge moving in anisotropic chiral matter arises from spontaneous photon radiation due to the chiral anomaly. While such a process, also known as the “vacuum Cherenkov radiation,” is forbidden in the QED vacuum, it can occur in chiral matter, where it is more appropriate to call it the “chiral Cherenkov radiation.” Its contribution to the radiation spectrum is of order α^{2} compared to α^{3} of the bremsstrahlung. I derive the frequency spectrum and the angular distribution of this radiation in the high energy limit. The quantum effects ...
Completely Top–Down Hierarchical Structure In Quantum Mechanics, Yakir Aharonov, Eliahu Cohen, Jeff Tollaksen
Completely Top–Down Hierarchical Structure In Quantum Mechanics, Yakir Aharonov, Eliahu Cohen, Jeff Tollaksen
Mathematics, Physics, and Computer Science Faculty Articles and Research
Can a large system be fully characterized using its subsystems via inductive reasoning? Is it possible to completely reduce the behavior of a complex system to the behavior of its simplest “atoms”? In this paper we answer these questions in the negative for a specific class of systems and measurements. After a general introduction of the topic, we present the main idea with a simple twoparticle example, where strong correlations arise between two apparently empty boxes. This leads to surprising effects within atomic and electromagnetic systems. A general construction based on preand postselected ensembles is then suggested, wherein the Nbody ...
Radiative Instability Of Quantum Electrodynamics In Chiral Matter, Kirill Tuchin
Radiative Instability Of Quantum Electrodynamics In Chiral Matter, Kirill Tuchin
Physics and Astronomy Publications
Modification of the photon dispersion relation in chiral matter enables 1 > 2 scattering. As a result, the single fermion and photon states are unstable to photon radiation and pair production respectively. In particular, a fast fermion moving through chiral matter can spontaneously radiate a photon, while a photon can spontaneously radiate a fast fermion and antifermion pair. The corresponding spectra are derived in the ultrarelativistic approximation. It is shown that the polarization of the produced and decayed photons is determined by the sign of the chiral conductivity. Impact of a flat thin domain wall on the spectra is computed.
The Weak Reality That Makes Quantum Phenomena More Natural: Novel Insights And Experiments, Yakir Aharonov, Eliahu Cohen, Mordecai Waegell, Avshalom C. Elitzur
The Weak Reality That Makes Quantum Phenomena More Natural: Novel Insights And Experiments, Yakir Aharonov, Eliahu Cohen, Mordecai Waegell, Avshalom C. Elitzur
Mathematics, Physics, and Computer Science Faculty Articles and Research
While quantum reality can be probed through measurements, the TwoState Vector Formalism (TSVF) reveals a subtler reality prevailing between measurements. Under special pre and postselections, odd physical values emerge. This unusual picture calls for a deeper study. Instead of the common, wavebased picture of quantum mechanics, we suggest a new, particlebased perspective: Each particle possesses a definite location throughout its evolution, while some of its physical variables (characterized by deterministic operators, some of which obey nonlocal equations of motion) are carried by “mirage particles” accounting for its unique behavior. Within the time interval between pre and postselection, the particle gives ...
Study Of The Kinetic Energy Densities Of Electrons As Applied To Quantum Dots In A Magnetic Field, Marlina Slamet, Viraht Sahni
Study Of The Kinetic Energy Densities Of Electrons As Applied To Quantum Dots In A Magnetic Field, Marlina Slamet, Viraht Sahni
Publications and Research
There are three expressions for the kinetic energy density t(r) expressed in terms of its quantal source, the single‐particle density matrix: t_{A}(r), the integrand of the kinetic energy expectation value; t_{B}(r), the trace of the kinetic energy tensor; t_{C}(r), a virial form in terms of the 'classical' kinetic field. These kinetic energy densities are studied by application to 'artificial atoms' or quantum dots in a magnetic field in a ground and excited singlet state. A comparison with the densities for natural atoms and molecules in their ground state is made. The near ...
CurrentDriven Production Of VortexAntivortex Pairs In Planar Josephson Junction Arrays And Phase Cracks In LongRange Order, Francisco EstellésDuart, Miguel Ortuño, Andrés M. Somoza, Valerii M. Vinokur, Alex Gurevich
CurrentDriven Production Of VortexAntivortex Pairs In Planar Josephson Junction Arrays And Phase Cracks In LongRange Order, Francisco EstellésDuart, Miguel Ortuño, Andrés M. Somoza, Valerii M. Vinokur, Alex Gurevich
Physics Faculty Publications
Proliferation of topological defects like vortices and dislocations plays a key role in the physics of systems with longrange order, particularly, superconductivity and superfluidity in thin films, plasticity of solids, and melting of atomic monolayers. Topological defects are characterized by their topological charge reflecting fundamental symmetries and conservation laws of the system. Conservation of topological charge manifests itself in extreme stability of static topological defects because destruction of a single defect requires overcoming a huge energy barrier proportional to the system size. However, the stability of driven topological defects remains largely unexplored. Here we address this issue and investigate numerically ...
Hedgehog SpinVortex Crystal Antiferromagnetic Quantum Criticality In Cak (Fe1−Xnix)4 As4 Revealed By Nmr, Qingping Ding, William R. Meier, J. Cui, Mingyu Xu, A. E. Böhmer, Sergey L. Bud’Ko, Paul C. Canfield, Yuji Furukawa
Hedgehog SpinVortex Crystal Antiferromagnetic Quantum Criticality In Cak (Fe1−Xnix)4 As4 Revealed By Nmr, Qingping Ding, William R. Meier, J. Cui, Mingyu Xu, A. E. Böhmer, Sergey L. Bud’Ko, Paul C. Canfield, Yuji Furukawa
Ames Laboratory Accepted Manuscripts
Two ordering states, antiferromagnetism and nematicity, have been observed in most ironbased superconductors (SCs). In contrast to those SCs, the newly discovered SC CaK(Fe1−xNix)4As4exhibits an antiferromagnetic (AFM) state, called hedgehog spinvortex crystal (SVC) structure, without nematic order, providing the opportunity for the investigation into the relationship between spin fluctuations and SC without any effects of nematic fluctuations. Our 75As nuclear magnetic resonance studies on CaK(Fe1−xNix)4As4 (0≤x≤0.049) revealed that CaKFe4As4 is located close to a hidden hedgehog SVC AFM quantumcritical point (QCP). The magnetic QCP without nematicity in CaK(Fe1−xNix)4As4 ...