Article
Physics, Multidisciplinary
M. Faridfar, Ahmadi Fouladi, J. Vahedi
Summary: We investigated the dynamics of one-dimensional spin models with uniform force, observing delocalization-localization transitions induced by a linear potential. The study focused on the dynamical quantum phase transition (DQPT) during sudden global quenches across a quantum critical point. XX and XXZ spin chains were considered, with analysis and numerical results provided for the XX model, which was mapped to free fermion particles. Nonanalyticities in dynamical free energy were found to characterize the localization-delocalization transitions. Interaction effects were explored using the time-dependent DMRG technique for the XXZ spin chains. Results showed the occurrence of DQPTs depending on the anisotropic parameter increment. The relation between DQPTs and correlation measures such as equilibrium order parameters and entanglement entropy production remains unclear. Further analysis connected DQPTs to average local magnetization, entanglement entropy production, and the Schmidt gap. ©2023 Elsevier B.V. All rights reserved.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Wang Yang, Alberto Nocera, Paul Herringer, Robert Raussendorf, Ian Affleck
Summary: This work analyzes the nonsymmorphic symmetry-group structures of various generalized Kitaev spin chains and ladders with bond alternations. The study provides insights into the symmetry-breaking patterns of magnetically ordered phases and the dimerization order parameters in the bond-alternating Kitaev-Gamma spin chains. The findings are valuable for understanding magnetic phases in related models and guiding further investigations on the symmetry classifications of mean field solutions.
Article
Materials Science, Multidisciplinary
Ming-Chiang Chung, Guang-Yu Huang, Ian P. McCulloch, Yuan-Hong Tsai
Summary: Using machine learning, the study investigates quantum phase transitions of magnetism systems and successfully maps out accurate phase diagrams and boundaries. The use of relevant correlation functions helps distinguish different phases and the analysis of silhouette values indicates a strong positive correlation near phase transition points.
Article
Physics, Multidisciplinary
T. Kalsi, A. Romito, H. Schomerus
Summary: This study investigates the measurement-induced entanglement transition in quantum circuits built upon Dyson's three circular ensembles. By contrasting different ensembles, the study reveals the interplay between the local entanglement generation by the gates and the entanglement reduction by the measurements.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Materials Science, Multidisciplinary
Christopher M. Langlett, Shenglong Xu
Summary: This work introduces a family of spin-1/2 many-body Hamiltonians based on the Fredkin spin chain, featuring a fragmented Hilbert space and quantum many-body scars. Exact middle spectrum eigenstates are constructed to demonstrate logarithmic or area-law entanglement entropy within each fractured subsector. The interplay between fragmentation and scarring results in rich tunable nonergodic dynamics.
Article
Physics, Multidisciplinary
Shaoying Yin, Jie Song, Shutian Liu, Yueyuan Wang, Lin Li, Wenjun Sun
Summary: The basis-independent coherence of spin-pairs and its distribution in spin chains with three-site interaction are investigated. The results demonstrate that the coherence characterizes the first-order quantum phase transition induced by the anisotropy parameter and the second-order quantum phase transition induced by the magnetic field and three-site interaction. Additionally, the study reveals the trade-off relations between collective and localized coherence through the triangle inequality and the regulation of the magnetic field.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2022)
Article
Materials Science, Multidisciplinary
G. Catarina, J. Fernandez-Rossier
Summary: This study provides numerical evidence that the Haldane phase for antiferromagnetic spin-1 chains can be realized using a Hubbard model at half filling. The noninteracting limit of the proposed model is found to describe a one-dimensional topological insulator, and it is conjectured to be adiabatically connected to the Haldane phase.
Article
Optics
G. Mouloudakis, T. Ilias, P. Lambropoulos
Summary: In this work, a recursive method for calculating the wave function of an XX spin chain is presented. The method is based on the time-dependent Schrodinger's equations and allows for closed-form solutions of the transformed amplitudes. The results demonstrate the system's dynamics and state-transfer properties for various parameter combinations, with detailed comparisons of Lorentzian and Ohmic reservoirs.
Article
Materials Science, Multidisciplinary
Stefano Scopa, Pasquale Calabrese, Alvise Bastianello
Summary: The confinement of elementary excitations in non-equilibrium quench dynamics induces the suppression and oscillation of entanglement entropy. In this study, we investigate this phenomenon in the weak quench limit and provide analytical predictions based on a Gaussian approximation of the many-body state. Our results accurately capture the numerical data and can be simplified to a semiclassical quasiparticle picture in the regime of weak confinement. We apply our methods to two prototypical models and find consistent results.
Article
Optics
Ling-Zhi Tang, Shu-Na Liu, Guo-Qing Zhang, Dan-Wei Zhang
Summary: In this study, we investigate the topology and localization of one-dimensional Hermitian and non-Hermitian Su-Schrieffer-Heeger chains with quasiperiodic hopping modulations. We obtain phase diagrams in the Hermitian case and show the presence of topological extended, intermediate, and localized phases due to the coexistence of independent topological and localization phase transitions driven by the quasiperiodic disorder. We also study the non-Hermitian effects on the TAIs and demonstrate the preservation of three types of TAIs under non-Hermitian perturbations.
Article
Mechanics
Yoshihiro Nishiyama
Summary: The study investigated the two-dimensional easy-plane SU(3) magnet under the influence of a transverse field using the exact-diagonalization method, aiming to reconcile discrepancies in large-N theory predictions. By extending the internal symmetry to easy-plane SU(3) with an anisotropy parameter eta, the study found that the introduction of eta could explain the singularity phenomenon observed in transverse-field-driven order-disorder phase transitions within certain limits.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2021)
Article
Mechanics
Yoshihiro Nishiyama
Summary: The two-dimensional spin-S = 1XY model was numerically investigated as a realization of the (2 vertical bar 1)D superfluid-Mott-insulator transition. By applying an external field of a unit flux quantum, the excess energy cost in the superfluid phase was evaluated, revealing a notable plateau near the critical point.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2022)
Article
Materials Science, Multidisciplinary
Xiaofan Zhou, Jian-Song Pan, Suotang Jia
Summary: We investigated the many-body topological physics of interacting fermions in an extended Su-Schrieffer-Heeger (SSH) model using the density-matrix renormalization-group numerical method. The interaction-driven phase transition from the topological insulator phase to the charge density wave (CDW) phase was identified by analyzing various properties. The global phase diagram was mapped, showing nontrivial topological insulator, trivial insulator, and CDW phases. The phase transitions between the CDW phase and topologically trivial or nontrivial phases were found to be continuous, contrary to the first-order phase transitions in the interacting SSH model. The phase diagram of the interacting spinful SSH4 model with attractive or repulsive on-site spin interaction was also presented.
Article
Physics, Multidisciplinary
Marissa D'Onofrio, Yuanheng Xie, A. J. Rasmusson, Evangeline Wolanski, Jiafeng Cui, Philip Richerme
Summary: Researchers experimentally studied two-dimensional (2D) Coulomb crystals in the radial-2D phase of a linear Paul trap, finding that the structural phase boundaries of such crystals can be well described by the pseudopotential approximation and the micromotion-induced heating is confined to the radial plane. They also verified that the transverse motional modes remain decoupled and cold in this geometric configuration, confirming the radial-2D ion crystals as a robust experimental platform for various theoretical proposals in quantum simulation and computation.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Li-Na Luan, Mei-Yu Zhang, Lin-Cheng Wang
Summary: This article investigates the Floquet dynamical quantum phase transitions (DQPTs) in transverse XY spin chains under the modulation of d-function periodic kickings. The system is analytically solved, and by considering the eigenstate and the ground state as the initial state of the Floquet dynamics, the multiple Floquet DQPTs emerged in the micromotion with different kicking moments are studied. The rate function of return amplitude, the Pancharatnam geometric phase, and the dynamical topological order parameter are calculated, which consistently verify the emergence of Floquet DQPTs in the system.
Article
Multidisciplinary Sciences
Pimonpan Sompet, Sarah Hirthe, Dominik Bourgund, Thomas Chalopin, Julian Bibo, Joannis Koepsell, Petar Bojovic, Ruben Verresen, Frank Pollmann, Guillaume Salomon, Christian Gross, Timon A. Hilker, Immanuel Bloch
Summary: Topology has revolutionized our understanding of quantum phases in many-body systems. In this study, a finite-temperature version of a topological Haldane phase is achieved using a quantum simulator based on ultracold atoms. The characteristics of the system, both at the edges and in the bulk, are directly revealed through measurements and correlation functions. The robustness of the phase to charge fluctuations far from the regime of the Heisenberg model is investigated by varying the Hubbard interaction strength.
Article
Astronomy & Astrophysics
Jiachen Jiang, Douglas J. K. Buisson, Thomas Dauser, Andrew C. Fabian, Felix Furst, Luigi C. Gallo, Fiona A. Harrison, Michael L. Parker, James F. Steiner, John A. Tomsick, Santiago Ubach, Dominic J. Walton
Summary: In this study, the NuSTAR and Swift spectra of the black hole candidate MAXI J1813-095 in a failed-transition outburst in 2018 were analyzed. The analysis revealed evidence of reflected emission from the inner region of the accretion disc and provided insights into the inner radius of the disc. The spectral variability of MAXI J1813-095 was found to be dominated by the variable photon index of the Comptonization emission.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Multidisciplinary Sciences
Hui-Ke Jin, W. M. H. Natori, F. Pollmann, J. Knolle
Summary: Recently, the authors have obtained exact results for the spin 3/2 model, and have found gapped and gapless quantum spin liquids. They have used an SO(6) Majorana representation of spin 3/2 to find an exact representation of the conserved plaquette fluxes, similar to the S=1/2 case. Their parton mean-field theory description is in quantitative agreement with numerical simulations and is further confirmed by the addition of a [001] single ion anisotropy. In the presence of a weak [111] anisotropy, they discuss an emergent chiral quantum spin liquid within a perturbation theory.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Particles & Fields
David Rogerson, Frank Pollmann, Ananda Roy
Summary: Defects in two-dimensional conformal field theories (CFTs) exhibit different characteristics in terms of entanglement properties. This work focuses on the entanglement entropy (EE) and entanglement negativity (EN) of subsystems in the Ising CFT with energy and duality defects. Interestingly, the EE for the duality defect is fundamentally different from the energy defect due to the existence of zero energy modes. The logarithmic scaling of the EN is found to have a continuously-varying effective central charge, which is different from that obtained from the EE. Defects also leave their fingerprints in the subleading term of the scaling of the EN.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Riley M. T. Connors, Javier A. Garcia, John Tomsick, Guglielmo Mastroserio, Victoria Grinberg, James F. Steiner, Jiachen Jiang, Andrew C. Fabian, Michael L. Parker, Fiona Harrison, Jeremy Hare, Labani Mallick, Hadar Lazar
Summary: The degree to which the thin accretion disks of black hole X-ray binaries are truncated during hard spectral states remains a contentious open question in black hole astrophysics. We reexamine the observed black hole X-ray binary XTE J1752-223 and show that reflection modeling requires that the disk be within about 5 R (ISCO) during the hard spectral state.
ASTROPHYSICAL JOURNAL
(2022)
Article
Engineering, Chemical
Oluwaseyi Ogunsola, Jazil Bin Shahid, Paul Michael
Summary: The effect of fluid properties on hydraulic cylinder rod seal stick-slip friction was investigated. The study findings provide a foundation for the development of fluids that can enhance the control and safety of hydraulic equipment.
CHEMICAL ENGINEERING & TECHNOLOGY
(2023)
Article
Astronomy & Astrophysics
Jiachen Jiang, Luigi C. Gallo, Dirk Grupe, Michael L. Parker
Summary: The study presents a spectral analysis of XMM-Newton observations of UGC 11763, indicating three spectral models that can explain the X-ray variability of the galaxy. Future high-resolution X-ray missions will help to further test these models on UGC 11763.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
S. Komossa, A. Kraus, D. Grupe, M. L. Parker, A. Gonzalez, L. C. Gallo, M. A. Gurwell, S. Laine, S. Yao, S. Chandra, L. Dey, J. L. Gomez, K. Hada, D. Haggard, A. R. Hollett, H. Jermak, S. Jorstad, T. P. Krichbaum, S. Markoff, C. McCall, J. Neilsen, M. Nowak
Summary: We are conducting the most extensive and longest multiyear, multiwavelength monitoring project on OJ 287. The MOMO project covers a wide range of wavelengths and aims to understand disk-jet physics and test the binary black hole scenario of OJ 287.
ASTRONOMISCHE NACHRICHTEN
(2023)
Article
Astronomy & Astrophysics
W. Kollatschny, D. Grupe, M. L. Parker, M. W. Ochmann, N. Schartel, E. Romero-Colmenero, H. Winkler, S. Komossa, P. Famula, M. A. Probst, M. Santos-Lleo
Summary: IRAS 23226-3843, a changing-look AGN, experienced a strong X-ray and UV flux outburst in 2019. During the outburst, it showed significant variations in the X-ray and optical continuum, as well as changes in the H α emission-line profiles. One year later, its optical spectral type changed to become a Seyfert type 2 object.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
S. Komossa, A. Kraus, D. Grupe, A. G. Gonzalez, M. A. Gurwell, L. C. Gallo, F. K. Liu, I. Myserlis, T. P. Krichbaum, S. Laine, U. Bach, J. L. Gomez, M. L. Parker, S. Yao, M. Berton
Summary: Based on our Swift monitoring program, OJ 287 is well-monitored in the X-ray-UV-optical regime. We report the results of our radio monitoring of OJ 287 between 2015 and 2022, including Fermi gamma-ray observations. We analyze the radio flux and spectral variability, discuss its connection with multiwavelength emission, and study the extraordinary 2016/2017 outburst.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Erin Kara, Aaron J. Barth, Edward M. Cackett, Jonathan Gelbord, John Montano, Yan-Rong Li, Lisabeth Santana, Keith Horne, William N. Alston, Douglas Buisson, Doron Chelouche, Pu Du, Andrew C. Fabian, Carina Fian, Luigi Gallo, Michael R. Goad, Dirk Grupe, Diego H. Gonzalez Buitrago, Juan V. Hernandez Santisteban, Shai Kaspi, Chen Hu, S. Komossa, Gerard A. Kriss, Collin Lewin, Tiffany Lewis, Michael Loewenstein, Anne Lohfink, Megan Masterson, Ian M. McHardy, Missagh Mehdipour, Jake Miller, Christos Panagiotou, Michael L. Parker, Ciro Pinto, Ron Remillard, Christopher Reynolds, Daniele Rogantini, Jian-Min Wang, Jingyi Wang, Dan Wilkins
Summary: We present the first results from a 100-day observing campaign of the Seyfert 1 galaxy Mrk 335 using three instruments. Despite a low X-ray flux state, we observed UV-optical lags as expected. Interestingly, both low- and high-flux states revealed longer UV-optical lags than expected. The optical rise preceded a sharp rise in X-rays, suggesting a departure from previous reprocessing models.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Marina Orio, Keith Gendreau, Morgan Giese, Gerardo Juan M. Luna, Jozef Magdolen, Tod E. Strohmayer, Andy E. Zhang, Diego Altamirano, Andrej Dobrotka, Teruaki Enoto, Elizabeth C. Ferrara, Richard Ignace, Sebastian Heinz, Craig Markwardt, Joy S. Nichols, Michael L. Parker, Dheeraj R. Pasham, Songpeng Pei, Pragati Pradhan, Ron Remillard, James F. Steiner, Francesco Tombesi
Summary: The 2021 outburst of the symbiotic recurrent nova RS Oph was monitored using the Neutron Star Interior Composition Explorer Mission (NICER). The study provides a detailed view of the outburst development, revealing that the X-ray flux preceding the supersoft X-ray phase peaked almost 5 days after the optical maximum and originated from shocked ejecta. The study also finds that a quasi-periodic oscillation with varying amplitudes was consistently observed during the supersoft X-ray source (SSS) phase.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Francesco Knechtli, Tomasz Korzec, Michael Peardon, Juan Andres Urrea-Nino
Summary: This paper introduces and optimizes more general operators in the space of smooth fields, enhancing the performance of the method when tested on systems of heavy quark-antiquark pairs.
Article
Engineering, Mechanical
Jill Bramer, Eric Sattler, Paul Michael
Summary: The US Army uses MIL-PRF-2104 SAE 10 hydraulic fluid in its construction and material handling equipment, but it has not been optimized for hydraulic system efficiency. Two energy efficient hydraulic fluids were compared to MIL-PRF-2104 SAE 10, and the study concluded that using higher efficiency fluids can reduce fuel consumption and save costs.
Meeting Abstract
Psychology, Clinical
Cassandra Smith, Michael Daniel, Paul Michael
ARCHIVES OF CLINICAL NEUROPSYCHOLOGY
(2022)