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- Gravitational waves (8)
- Atoms (7)
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- Excited States (3)
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- Signal to noise ratio (3)
- Van Der Waals Forces (3)
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- Atom lasers (2)
- Atomic physics (2)
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- Cosmology: observations (2)
- Dark-bright solitons (2)
- Electrodynamics (2)
- Electron impact-ionization (2)
- Electron-electron interactions (2)
- False alarm rate (2)
- Fragmentation (2)
- Gamma-ray burst: general (2)
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- Intelligent systems (2)
Articles 31 - 60 of 64
Full-Text Articles in Physical Sciences and Mathematics
Quantum Percolation Phase Transition And Magnetoelectric Dipole Glass In Hexagonal Ferrites, S. E. Rowley, Thomas Vojta, A. T. Jones, W. Guo, J. Oliveira, For Full List Of Authors, See Publisher's Website.
Quantum Percolation Phase Transition And Magnetoelectric Dipole Glass In Hexagonal Ferrites, S. E. Rowley, Thomas Vojta, A. T. Jones, W. Guo, J. Oliveira, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
Hexagonal ferrites not only have enormous commercial impact (£2 billion/year in sales) due to applications that include ultrahigh-density memories, credit-card stripes, magnetic bar codes, small motors, and low-loss microwave devices, they also have fascinating magnetic and ferroelectric quantum properties at low temperatures. Here we report the results of tuning the magnetic ordering temperature in PbFe12-xGaxO19 to zero by chemical substitution x. The phase transition boundary is found to vary as TN ∼ (1-x/xc)2/3 with xc very close to the calculated spin percolation threshold, which we determine by Monte Carlo simulations, …
Dark-Bright Soliton Dynamics Beyond The Mean-Field Approximation, Garyfallia C. Katsimiga, G. M. Koutentakis, Simeon I. Mistakidis, P. G. Kevrekidis, P. Schmelcher
Dark-Bright Soliton Dynamics Beyond The Mean-Field Approximation, Garyfallia C. Katsimiga, G. M. Koutentakis, Simeon I. Mistakidis, P. G. Kevrekidis, P. Schmelcher
Physics Faculty Research & Creative Works
The Dynamics Of Dark-Bright (DB) Solitons Beyond The Mean-Field Approximation Is Investigated. We First Examine The Case Of A Single DB Soliton And Its Oscillations Within A Parabolic Trap. Subsequently, We Move To The Setting Of Collisions, Comparing The Mean-Field Approximation To That Involving Multiple Orbitals In Both The Dark And The Bright Component. Fragmentation Is Present And Significantly Affects The Dynamics, Especially In The Case Of Slower Solitons And In That Of Lower Atom Numbers. It Is Shown That The Presence Of Fragmentation Allows For Bipartite Entanglement Between The Distinguishable Species. Most Importantly The Interplay Between Fragmentation And Entanglement …
Superfluid-Mott Glass Quantum Multicritical Point On A Percolating Lattice, Martin Puschmann, Thomas Vojta
Superfluid-Mott Glass Quantum Multicritical Point On A Percolating Lattice, Martin Puschmann, Thomas Vojta
Physics Faculty Research & Creative Works
We employ large-scale Monte Carlo simulations to study a particle-hole symmetric site-diluted quantum rotor model in two dimensions. The ground state phase diagram of this system features two distinct quantum phase transitions between the superuid and the insulating (Mott glass) phases. They are separated by a multicritical point. The generic transition for dilutions below the lattice percolation threshold is driven by quantum uctuations while thetransition across the percolation threshold is due to the geometric uctuations of the lattice. We determine the location of the multicritical point between these two transitions and find its critical behavior. The multicritical exponents read z …
Determination Of The Energy Band Gap Of Bi₂Se₃, G. Martinez, B. A. Piot, M. Hakl, M. Potemski, Yew San Hor
Determination Of The Energy Band Gap Of Bi₂Se₃, G. Martinez, B. A. Piot, M. Hakl, M. Potemski, Yew San Hor
Physics Faculty Research & Creative Works
Despite intensive investigations of Bi2Se3 in past few years, the size and nature of the bulk energy band gap of this well-known 3D topological insulator still remain unclear. Here we report on a combined magneto-transport, photoluminescence and infrared transmission study of Bi2Se3, which unambiguously shows that the energy band gap of this material is direct and reaches Eg = (220 ± 5) meV at low temperatures.
Quantum Griffiths Phase Inside The Ferromagnetic Phase Of Ni₁₋ₓvₓ, Ruize Wang, Adane Gebretsadik, Sara Ubaid-Kassis, Almut Schroeder, Thomas Vojta, For Full List Of Authors, See Publisher's Website.
Quantum Griffiths Phase Inside The Ferromagnetic Phase Of Ni₁₋ₓvₓ, Ruize Wang, Adane Gebretsadik, Sara Ubaid-Kassis, Almut Schroeder, Thomas Vojta, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We study by means of bulk and local probes the d-metal alloy Ni1-xVx close to the quantum critical concentration, xc ≈ 11.6%, where the ferromagnetic transition temperature vanishes. The magnetization-field curve in the ferromagnetic phase takes an anomalous power-law form with a nonuniversal exponent that is strongly x dependent and mirrors the behavior in the paramagnetic phase. Muon spin rotation experiments demonstrate inhomogeneous magnetic order and indicate the presence of dynamic fluctuating magnetic clusters. These results provide strong evidence for a quantum Griffiths phase on the ferromagnetic side of the quantum phase transition.
Search For Gravitational Waves From Scorpius X-1 In The First Advanced Ligo Observing Run With A Hidden Markov Model, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Search For Gravitational Waves From Scorpius X-1 In The First Advanced Ligo Observing Run With A Hidden Markov Model, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
Results are presented from a semicoherent search for continuous gravitational waves from the brightest low-mass X-ray binary, Scorpius X-1, using data collected during the first Advanced LIGO observing run. The search combines a frequency domain matched filter (Bessel-weighted F-statistic) with a hidden Markov model to track wandering of the neutron star spin frequency. No evidence of gravitational waves is found in the frequency range 60-650 Hz. Frequentist 95% confidence strain upper limits, h095%=4.0 x 10-25, 8.3 x 10-25, and 3.0 x 10-25 for electromagnetically restricted source orientation, unknown polarization, and circular …
Lensing Is Low: Cosmology, Galaxy Formation Or New Physics?, Alexie Leauthaud, Shun Saito, For Full List Of Authors, See Publisher's Website.
Lensing Is Low: Cosmology, Galaxy Formation Or New Physics?, Alexie Leauthaud, Shun Saito, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We present high signal-to-noise galaxy-galaxy lensing measurements of the Baryon Oscillation Spectroscopic Survey constant mass (CMASS) sample using 250 deg2 of weak-lensing data from Canada-France-Hawaii Telescope Lensing Survey and Canada-France-Hawaii Telescope Stripe 82 Survey. We compare this signal with predictions from mock catalogues trained to match observables including the stellar mass function and the projected and twodimensional clustering of CMASS. We show that the clustering of CMASS, together with standard models of the galaxy-halo connection, robustly predicts a lensing signal that is 20-40 per cent larger than observed. Detailed tests show that our results are robust to a variety …
Gw170104: Observation Of A 50-Solar-Mass Binary Black Hole Coalescence At Redshift 0.2, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Gw170104: Observation Of A 50-Solar-Mass Binary Black Hole Coalescence At Redshift 0.2, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We describe the observation of GW170104, a gravitational-wave signal produced by the coalescence of a pair of stellar-mass black holes. The signal was measured on January 4, 2017 at 10 11:58.6 UTC by the twin advanced detectors of the Laser Interferometer Gravitational-Wave Observatory during their second observing run, with a network signal-to-noise ratio of 13 and a false alarm rate less than 1 in 70 000 years. The inferred component black hole masses are 31.2-6.0+8.4M⊙ and 19.4-5.9+5.3M⊙ (at the 90% credible level). The black hole spins are best constrained through measurement of the effective …
Quantum Dynamical Response Of Ultracold Few-Boson Ensembles In Finite Optical Lattices To Multiple Interaction Quenches, J. Neuhaus-Steinmetz, Simeon I. Mistakidis, P. Schmelcher
Quantum Dynamical Response Of Ultracold Few-Boson Ensembles In Finite Optical Lattices To Multiple Interaction Quenches, J. Neuhaus-Steinmetz, Simeon I. Mistakidis, P. Schmelcher
Physics Faculty Research & Creative Works
The Correlated Nonequilibrium Quantum Dynamics Following A Multiple Interaction Quench Protocol For Few-Bosonic Ensembles Confined In Finite Optical Lattices Is Investigated. The Quenches Give Rise To An Interwell Tunneling And Excite The Cradle And A Breathing Mode. Several Tunneling Pathways Open During The Time Interval Of Increased Interactions, While Only A Few Occur When The System Is Quenched Back To Its Original Interaction Strength. The Cradle Mode, However, Persists During And In Between The Quenches, While The Breathing Mode Possesses Distinct Frequencies. The Occupation Of Excited Bands Is Explored In Detail Revealing A Monotonic Behavior With Increasing Quench Amplitude And …
Search For Gravitational Waves Associated With Gamma-Ray Bursts During The First Advanced Ligo Observing Run And Implications For The Origin Of Grb 150906b, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Search For Gravitational Waves Associated With Gamma-Ray Bursts During The First Advanced Ligo Observing Run And Implications For The Origin Of Grb 150906b, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We present the results of the search for gravitational waves (GWs) associated with γ-ray bursts detected during the first observing run of the Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO). We find no evidence of a GW signal for any of the 41 γ-ray bursts for which LIGO data are available with sufficient duration. For all γ-ray bursts, we place lower bounds on the distance to the source using the optimistic assumption that GWs with an energy of were emitted within the-Hz band, and we find a median 90% confidence limit of 71 Mpc at 150 Hz. For the subset of …
Role Of The Recoil Ion In Single-Electron Capture And Single-Ionization Processes For Collisions Of Protons With He And Ar Atoms, P. Focke, Ronald E. Olson, N. D. Cariatore, M. Alessi, S. Otranto
Role Of The Recoil Ion In Single-Electron Capture And Single-Ionization Processes For Collisions Of Protons With He And Ar Atoms, P. Focke, Ronald E. Olson, N. D. Cariatore, M. Alessi, S. Otranto
Physics Faculty Research & Creative Works
In this work the single-electron capture and single-ionization processes are studied for proton collisions with He and Ar atoms at impact energies in the range 25–100 keV. Classical trajectory Monte Carlo simulations are benchmarked against experimental data obtained at the reaction microscope in Bariloche, Argentina, which employs the cold target recoil-ion momentum spectroscopy technique. Special emphasis is placed on describing the momentum transfer to the recoil ion for these collision systems.
Stability And Dynamics Of Dark-Bright Soliton Bound States Away From The Integrable Limit, Garyfallia C. Katsimiga, Jan Stockhofe, Panagiotis G. Kevrekidis, Peter Schmelcher
Stability And Dynamics Of Dark-Bright Soliton Bound States Away From The Integrable Limit, Garyfallia C. Katsimiga, Jan Stockhofe, Panagiotis G. Kevrekidis, Peter Schmelcher
Physics Faculty Research & Creative Works
The existence, stability, and dynamics of bound pairs of symbiotic matter waves in the form of dark-bright soliton pairs in two-component mixtures of atomic Bose-Einstein condensates is investigated. Motivated by the tunability of the atomic interactions in recent experiments, we explore in detail the impact that changes in the interaction strengths have on these bound pairs by considering significant deviations from the integrable limit. It is found that dark-bright soliton pairs exist as stable configurations in a wide parametric window spanning both the miscible and the immiscible regime of interactions. Outside this parameter interval, two unstable regions are identified and …
Search For Continuous Gravitational Waves From Neutron Stars In Globular Cluster Ngc 6544, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Search For Continuous Gravitational Waves From Neutron Stars In Globular Cluster Ngc 6544, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We describe a directed search for continuous gravitational waves in data from the sixth initial LIGO science run. The target was the nearby globular cluster NGC 6544 at a distance of ≈2.7 kpc. The search covered a broad band of frequencies along with first and second frequency derivatives for a fixed sky position. The search coherently integrated data from the two LIGO interferometers over a time span of 9.2 days using the matched-filtering F-statistic. We found no gravitational-wave signals and set 95% confidence upper limits as stringent as 6.0 x 10-25 on intrinsic strain and 8.5 x 10 …
First Search For Gravitational Waves From Known Pulsars With Advanced Ligo, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
First Search For Gravitational Waves From Known Pulsars With Advanced Ligo, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We present the result of searches for gravitational waves from 200 pulsars using data from the first observing run of the Advanced LIGO detectors. We find no significant evidence for a gravitational-wave signal from any of these pulsars, but we are able to set the most constraining upper limits yet on their gravitational-wave amplitudes and ellipticities. For eight of these pulsars, our upper limits give bounds that are improvements over the indirect spin-down limit values. For another 32, we are within a factor of 10 of the spin-down limit, and it is likely that some of these will be reachable …
Long-Range Tails In Van Der Waals Interactions Of Excited-State And Ground-State Atoms, Ulrich D. Jentschura, V. Debierre
Long-Range Tails In Van Der Waals Interactions Of Excited-State And Ground-State Atoms, Ulrich D. Jentschura, V. Debierre
Physics Faculty Research & Creative Works
A quantum electrodynamic calculation of the interaction of an excited-state atom with a ground-state atom is performed. For an excited reference state and a lower-lying virtual state, the contribution to the interaction energy naturally splits into a pole term and a Wick-rotated term. The pole term is shown to dominate in the long-range limit, altering the functional form of the interaction from the retarded 1/R7 Casimir-Polder form to a long-range tail - provided by the Wick-rotated term - proportional to cos[2(Em - En)R/(ħc)]/R2, where Em < En is the energy of a virtual state, …
Calibration Of The Advanced Ligo Detectors For The Discovery Of The Binary Black-Hole Merger Gw150914, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Calibration Of The Advanced Ligo Detectors For The Discovery Of The Binary Black-Hole Merger Gw150914, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
In Advanced LIGO, detection and astrophysical source parameter estimation of the binary black hole merger GW150914 requires a calibrated estimate of the gravitational-wave strain sensed by the detectors. Producing an estimate from each detector's differential arm length control loop readout signals requires applying time domain filters, which are designed from a frequency domain model of the detector's gravitational-wave response. The gravitational-wave response model is determined by the detector's opto-mechanical response and the properties of its feedback control system. The measurements used to validate the model and characterize its uncertainty are derived primarily from a dedicated photon radiation pressure actuator, with …
Upper Limits On The Stochastic Gravitational-Wave Background From Advanced Ligo's First Observing Run, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Upper Limits On The Stochastic Gravitational-Wave Background From Advanced Ligo's First Observing Run, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
A wide variety of astrophysical and cosmological sources are expected to contribute to a stochastic gravitational-wave background. Following the observations of GW150914 and GW151226, the rate and mass of coalescing binary black holes appear to be greater than many previous expectations. As a result, the stochastic background from unresolved compact binary coalescences is expected to be particularly loud. We perform a search for the isotropic stochastic gravitational-wave background using data from Advanced Laser Interferometer Gravitational Wave Observatory's (aLIGO) first observing run. The data display no evidence of a stochastic gravitational-wave signal. We constrain the dimensionless energy density of gravitational waves …
Virtual Resonant Emission And Oscillatory Long-Range Tails In Van Der Waals Interactions Of Excited States: Qedtreatment And Applications, Ulrich D. Jentschura, Chandra Mani Adhikari, Vincent Debierre
Virtual Resonant Emission And Oscillatory Long-Range Tails In Van Der Waals Interactions Of Excited States: Qedtreatment And Applications, Ulrich D. Jentschura, Chandra Mani Adhikari, Vincent Debierre
Physics Faculty Research & Creative Works
We report on a quantum electrodynamic (QED) investigation of the interaction between a ground state atom with another atom in an excited state. General expressions, applicable to any atom, are indicated for the long-range tails that are due to virtual resonant emission and absorption into and from vacuum modes whose frequency equals the transition frequency to available lower-lying atomic states. For identical atoms, one of which is in an excited state, we also discuss the mixing term that depends on the symmetry of the two-atom wave function (these evolve into either the gerade or the ungerade state for close approach), …
Retrieval Of Target Structure Information From Laser-Induced Photoelectrons By Few-Cycle Bicircular Laser Fields, Van-Hung Hoang, Van-Hoang Le, C. D. Lin, Anh-Thu Le
Retrieval Of Target Structure Information From Laser-Induced Photoelectrons By Few-Cycle Bicircular Laser Fields, Van-Hung Hoang, Van-Hoang Le, C. D. Lin, Anh-Thu Le
Physics Faculty Research & Creative Works
By analyzing theoretical results from a numerical solution of the time-dependent Schrödinger equation for atoms in few-cycle bicircular laser pulses, we show that high-energy photoelectron momentum spectra can be used to extract accurate elastic scattering differential cross sections of the target ion with free electrons. We find that the retrieval range for a scattering angle with bicircular pulses is wider than with linearly polarized pulses, although the retrieval method has to be modified to account for different returning directions of the electron in the continuum. This result can be used to extend the range of applicability of ultrafast imaging techniques …
Directional Limits On Persistent Gravitational Waves From Advanced Ligos First Observing Run, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Directional Limits On Persistent Gravitational Waves From Advanced Ligos First Observing Run, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We employ gravitational-wave radiometry to map the stochastic gravitational wave background expected from a variety of contributing mechanisms and test the assumption of isotropy using data from the Advanced Laser Interferometer Gravitational Wave Observatory's (aLIGO) first observing run. We also search for persistent gravitational waves from point sources with only minimal assumptions over the 20-1726 Hz frequency band. Finding no evidence of gravitational waves from either point sources or a stochastic background, we set limits at 90% confidence. For broadband point sources, we report upper limits on the gravitational wave energy flux per unit frequency in the range FαΘ …
Ionization Study Of Isomeric Molecules In Strong-Field Laser Pulses, Stefan Zigo, Anh-Thu Le, Pratap Timilsina, Carlos A. Trallero-Herrero
Ionization Study Of Isomeric Molecules In Strong-Field Laser Pulses, Stefan Zigo, Anh-Thu Le, Pratap Timilsina, Carlos A. Trallero-Herrero
Physics Faculty Research & Creative Works
Through the use of the technique of time-of-flight mass spectroscopy, we obtain strong-field ionization yields for randomly oriented 1,2-dichloroethylene (1,2-DCE) (C₂H₂Cl₂) and 2-butene (C₄H₈). We are interested in studying the effect of conformal structure in strong-field ionization and, in particular, the role of molecular polarity. That is, we can perform strong-field ionization studies in polar vs non-polar molecules that have the same chemical composition. We report our findings through the ionization yields and the ratio (trans/cis) of each stereoisomer pair as a function of intensity.
Long-Range Interactions Of Hydrogen Atoms In Excited States. I. 2s-1s Interactions And Dirac-Δ Perturbations, Chandra Mani Adhikari, Vincent Debierre, Arthur N. Matveev, Nikolai N. Kolachevsky, Ulrich D. Jentschura
Long-Range Interactions Of Hydrogen Atoms In Excited States. I. 2s-1s Interactions And Dirac-Δ Perturbations, Chandra Mani Adhikari, Vincent Debierre, Arthur N. Matveev, Nikolai N. Kolachevsky, Ulrich D. Jentschura
Physics Faculty Research & Creative Works
The theory of the long-range interaction of metastable excited atomic states with ground-state atoms is analyzed. We show that the long-range interaction is essentially modified when quasidegenerate states are available for virtual transitions. A discrepancy in the literature regarding the van der Waals coefficient C6 (2S ;1 S ) describing the interaction of metastable atomic hydrogen ( 2 S state) with a ground-state hydrogen atom is resolved. In the the van der Waals range a0 ≪ R ≪ a0 / α , where a0 = ℏ / α m c is the Bohr radius and α …
Influence Of Permanent Dipole And Dynamic Core-Electron Polarization On Tunneling Ionization Of Polar Molecules, Van-Hung Hoang, Song-Feng Zhao, Van-Hoang Le, Anh-Thu Le
Influence Of Permanent Dipole And Dynamic Core-Electron Polarization On Tunneling Ionization Of Polar Molecules, Van-Hung Hoang, Song-Feng Zhao, Van-Hoang Le, Anh-Thu Le
Physics Faculty Research & Creative Works
We present a detailed theoretical investigation on strong-field ionization of polar (CO and NO) as well as nonpolar molecules (N₂, O₂, and CO₂). Our results indicate that accounting for the Stark correction in the molecular tunneling ionization theory leads to overall fairly good agreements with numerical solutions of the time-dependent Schrödinger equation. Furthermore, we show that the effect of dynamic core-electron polarization, in general, has a weak influence on the angle-dependent ionization probability. However, in the case of CO we confirm the recent finding by B. Zhang, J. Yuan, and Z. Zhao [Phys. Rev. Lett. 111, 163001 (2013)PRLTAO0031-900710.1103/PhysRevLett.111.163001] that accounting …
Electron-Impact Ionization Of H₂O At Low Projectile Energy: Internormalized Triple-Differential Cross Sections In Three-Dimensional Kinematics, Xueguang Ren, Sadek Amami, Khokon Hossen, Esam Ali, Chuangang Ning, James Colgan, Don H. Madison, Andrew Dorn
Electron-Impact Ionization Of H₂O At Low Projectile Energy: Internormalized Triple-Differential Cross Sections In Three-Dimensional Kinematics, Xueguang Ren, Sadek Amami, Khokon Hossen, Esam Ali, Chuangang Ning, James Colgan, Don H. Madison, Andrew Dorn
Physics Faculty Research & Creative Works
We report a combined experimental and theoretical study of the electron-impact ionization of water (H2O) at the relatively low incident energy of E0=81eV in which either the 1b1 or 3a1 orbitals are ionized leading to the stable H2O cation. The experimental data were measured by using a reaction microscope, which can cover nearly the entire 4π solid angle for the secondary electron emission over a range of ejection energies. We present experimental data for the scattering angles of 6⁰ and 10⁰ for the faster of the two outgoing electrons as a function …
All-Sky Search For Short Gravitational-Wave Bursts In The First Advanced Ligo Run, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
All-Sky Search For Short Gravitational-Wave Bursts In The First Advanced Ligo Run, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We present the results from an all-sky search for short-duration gravitational waves in the data of the first run of the Advanced LIGO detectors between September 2015 and January 2016. The search algorithms use minimal assumptions on the signal morphology, so they are sensitive to a wide range of sources emitting gravitational waves. The analyses target transient signals with duration ranging from milliseconds to seconds over the frequency band of 32 to 4096 Hz. The first observed gravitational-wave event, GW150914, has been detected with high confidence in this search; the other known gravitational-wave event, GW151226, falls below the search's sensitivity. …
Long-Range Interactions Of Hydrogen Atoms In Excited States. Ii. Hyperfine-Resolved 2s-2s Systems, Ulrich D. Jentschura, Vincent Debierre, Chandra Mani Adhikari, Arthur N. Matveev, Nikolai N. Kolachevsky
Long-Range Interactions Of Hydrogen Atoms In Excited States. Ii. Hyperfine-Resolved 2s-2s Systems, Ulrich D. Jentschura, Vincent Debierre, Chandra Mani Adhikari, Arthur N. Matveev, Nikolai N. Kolachevsky
Physics Faculty Research & Creative Works
The interaction of two excited hydrogen atoms in metastable states constitutes a theoretically interesting problem because of the quasidegenerate 2P1/2 levels that are removed from the 2S states only by the Lamb shift. The total Hamiltonian of the system is composed of the van der Waals Hamiltonian, the Lamb shift, and the hyperfine effects. The van der Waals shift becomes commensurate with the 2S-2P3/2 fine-structure splitting only for close approach (R < 100a0, where a0 is the Bohr radius) and one may thus restrict the discussion to the levels with n = 2 and J = 1/2 …
Monte Carlo Simulations Of The Disordered Three-Color Quantum Ashkin-Teller Chain, Ahmed K. Ibrahim, Thomas Vojta
Monte Carlo Simulations Of The Disordered Three-Color Quantum Ashkin-Teller Chain, Ahmed K. Ibrahim, Thomas Vojta
Physics Faculty Research & Creative Works
We investigate the zero-temperature quantum phase transitions of the disordered three-color quantum Ashkin-Teller spin chain by means of large-scale Monte Carlo simulations. We find that the first-order phase transitions of the clean system are rounded by the quenched disorder. For weak intercolor coupling, the resulting emergent quantum critical point between the paramagnetic phase and the magnetically ordered Baxter phase is of infinite-randomness type and belongs to the universality class of the random transverse-field Ising model, as predicted by recent strong-disorder renormalization group calculations. We also find evidence for unconventional critical behavior in the case of strong intercolor coupling, even though …
Mode Coupling Of Interaction Quenched Ultracold Few-Boson Ensembles In Periodically Driven Lattices, Simeon I. Mistakidis, P. Schmelcher
Mode Coupling Of Interaction Quenched Ultracold Few-Boson Ensembles In Periodically Driven Lattices, Simeon I. Mistakidis, P. Schmelcher
Physics Faculty Research & Creative Works
The Out-Of-Equilibrium Dynamics Of Interaction Quenched Finite Ultracold Bosonic Ensembles In Periodically Driven One-Dimensional Optical Lattices Is Investigated. It Is Shown That Periodic Driving Enforces The Bosons In The Outer Wells Of The Finite Lattice To Exhibit Out-Of-Phase Dipolelike Modes, While In The Central Well The Atomic Cloud Experiences A Local Breathing Mode. The Dynamical Behavior Is Investigated With Varying Driving Frequencies, Revealing Resonantlike Behavior Of The Intrawell Dynamics. An Interaction Quench In The Periodically Driven Lattice Gives Rise To Admixtures Of Different Excitations In The Outer Wells, Enhanced Breathing In The Center, And Amplification Of The Tunneling Dynamics. We …
Dark-Bright Soliton Interactions Beyond The Integrable Limit, Garyfallia C. Katsimiga, J. Stockhofe, P. G. Kevrekidis, P. Schmelcher
Dark-Bright Soliton Interactions Beyond The Integrable Limit, Garyfallia C. Katsimiga, J. Stockhofe, P. G. Kevrekidis, P. Schmelcher
Physics Faculty Research & Creative Works
In this work we present a systematic theoretical analysis regarding dark-bright solitons and their interactions, motivated by recent advances in atomic two-component repulsively interacting Bose-Einstein condensates. In particular, we study analytically via a two-soliton ansatz adopted within a variational formulation the interaction between two dark-bright solitons in a homogeneous environment beyond the integrable regime, by considering general inter- and intra-atomic interaction coefficients. We retrieve the possibility of a fixed point in the case where the bright solitons are out of phase. As the intercomponent interaction is increased, we also identify an exponential instability of the two-soliton state, associated with a …
Quench-Induced Resonant Tunneling Mechanisms Of Bosons In An Optical Lattice With Harmonic Confinement, G. M. Koutentakis, Simeon I. Mistakidis, P. Schmelcher
Quench-Induced Resonant Tunneling Mechanisms Of Bosons In An Optical Lattice With Harmonic Confinement, G. M. Koutentakis, Simeon I. Mistakidis, P. Schmelcher
Physics Faculty Research & Creative Works
The Nonequilibrium Dynamics Of Small Boson Ensembles In A One-Dimensional Optical Lattice Is Explored Upon A Sudden Quench Of An Additional Harmonic Trap From Strong To Weak Confinement. We Find That The Competition Between The Initial Localization And The Repulsive Interaction Leads To A Resonant Response Of The System For Intermediate Quench Amplitudes, Corresponding To Avoided Crossings In The Many-Body Eigenspectrum With Varying Final Trap Frequency. In Particular, We Show That These Avoided Crossings Can Be Utilized To Prepare The System In A Desired State. The Dynamical Response Is Shown To Depend On Both The Interaction Strength As Well As …