Article
Materials Science, Multidisciplinary
Jose M. P. Carmelo, Tilen Cadez, Pedro D. Sacramento
Summary: The study focuses on the interaction between charge and spin degrees of freedom in one-dimensional Mott-Hubbard insulators, particularly looking at the one-particle spectral functions in the presence of finite magnetic fields to reveal basic physical information about spin-charge correlations.
Article
Physics, Multidisciplinary
Frank Goehmann, Raphael Kleinemuehl, Alexander Weisse
Summary: The descriptive review of the fermionic basis approach to the theory of correlation functions of the XXZ quantum spin chain focuses on explicit formulae for short-range correlation functions that can be implemented on a computer. Within this approach, a class of stationary reduced density matrices, compatible with the integrable structure of the model, assumes a factorized form. Expectation values of local operators and two-point functions can be represented as multivariate polynomials in only two functions rho and omega and their derivatives with coefficients rational in the deformation parameter q.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2021)
Article
Physics, Multidisciplinary
Shah Saad Alam, Timothy Skaras, Li Yang, Han Pu
Summary: Dynamical fermionization phenomenon in Tonks-Girardeau gases shows that the momentum density profile approaches that of an ideal Fermi gas after being released from harmonic confinement. By extending the study to a one-dimensional spinor gas of arbitrary spin in a strongly interacting regime, it is analytically proven that the total momentum distribution resembles that of a spinless ideal Fermi gas and each spin component maintains the shape of the initial real space density profile.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
E. Cuestas, C. Cormick
Summary: This study investigates the conditions under which particles made of two fermions can be treated as elementary bosons, presenting the coboson formalism as a powerful tool. It indicates that the proposed ansatz for the ground state of N pairs may fail in one-dimensional systems, but offers insights on how to recover the correct ground state using the coboson theory.
Article
Mechanics
Jacopo De Nardis, Benjamin Doyon, Marko Medenjak, Milosz Panfil
Summary: This article reviews recent advances in exact results for dynamical correlation functions and related transport coefficients in interacting integrable models at large scales. The discussion includes topics such as Drude weights, conductivity and diffusion constants, as well as linear and nonlinear response in equilibrium and non-equilibrium states. The authors consider the problems from the perspectives of the general hydrodynamic theory of many-body systems and form-factor expansions in integrable models, showing how they provide a comprehensive and consistent set of exact methods for extracting large scale behaviors. Various applications in integrable spin chains and field theories are also discussed.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2022)
Article
Physics, Multidisciplinary
Wen Li, Mert Okyay, Rafael Nepomechie
Summary: A probabilistic algorithm has been found for preparing Bethe eigenstates of the spin-1/2 Heisenberg spin chain on a quantum computer, but the success probability decreases exponentially with the chain length. Although it is feasible to compute antiferromagnetic ground-state spin-spin correlation functions for short chains, it is not possible for chains of moderate length.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Optics
Ovidiu Patu
Summary: The study demonstrates that the momentum distribution of a gas released from a trap asymptotically approaches that of a noninteracting Fermi gas in the initial trap, a phenomenon known as dynamical fermionization. This behavior has been experimentally confirmed in certain cases. Additionally, removal of axial confinement in a strongly interacting Bose-Fermi mixture also leads to dynamical fermionization, with the momentum distribution of each component resembling its density profile at the initial time. The dynamics of both fermionic and bosonic momentum distributions exhibit characteristics similar to single component bosons under a sudden change in trap frequency.
Article
Materials Science, Multidisciplinary
D. V. Kurlov, M. S. Bahovadinov, S. I. Matveenko, A. K. Fedorov, V. Gritsev, B. L. Altshuler, G. V. Shlyapnikov
Summary: We study the one-dimensional Hubbard model for two-component fermions with infinitely strong on-site repulsion in the presence of disorder. The nature of the emerging phases is drastically changed by the type of disorder. Spin-independent disorder can be treated as a single-particle problem with Anderson localization, while spin-dependent disorder leads to a many-body localization-delocalization transition. We find an explicit analytic expression for the matrix elements of the random magnetic field and support the existence of the many-body localization-delocalization transition in this system.
Article
Physics, Multidisciplinary
Yong Zheng
Summary: The study investigates the one-dimensional Bose-Hubbard model in the large-U limit by reducing and mapping the Hamiltonian to a simpler form. Exact eigenstates and eigenvalues have been obtained in subspaces with fixed numbers of single- and double-occupancies, excluding multiple-occupancies, and the thermodynamic properties of the system have been calculated. Furthermore, the development of a new perturbation treatment for the model based on these eigenstates and eigenvalues has also been discussed.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Optics
Maciej Lebek, Andrzej Syrwid, Piotr T. Grochowski, Kazimierz Rzazewski
Summary: We analyze the dynamics of one-dimensional quantum gases with strongly attractive contact interactions and find that attractive forces can effectively act as strongly repulsive ones. Our findings extend the theoretical results on the super-Tonks-Girardeau gas and have implications for the domain stability in a two-component Fermi gas. We also discuss the effects of finite-range interactions and analyze the universality of the presented results. Moreover, our conclusions support the existence of metastable quantum droplets in the regime of strongly attractive contact and attractive dipolar interactions.
Article
Astronomy & Astrophysics
Michael C. Abbott, Ines Aniceto
Summary: This paper presents the first known integrable relativistic field theories that include interacting massive and massless sectors, highlighting the importance of understanding the massless sector for the spectrum of the massive sector. The authors show that terms in the spectrum polynomial in the spatial volume require the full Thermodynamic Bethe Ansatz integral equations, rather than just Liischer-like corrections. The implications of these results for AdS/CFT are noted as motivation for the study, although only field-theory results are presented here.
Article
Materials Science, Multidisciplinary
Jia-Jia Luo, Han Pu, Xi -Wen Guan
Summary: In this study, a rigorous understanding of the one-dimensional repulsive Fermi-Hubbard model is provided based on the solutions to the thermodynamic Bethe ansatz equations. The fractional excitations, universal properties, and asymptotic of correlation functions in various phases are calculated and analyzed. The interaction-driven phase transition and its relationship with the contact susceptibilities and variations of density, magnetization, and entropy are also investigated. Furthermore, a quantum cooling scheme based on the interaction-driven refrigeration cycle is proposed as an application of these concepts, which are applicable to higher-dimensional systems.
Article
Physics, Particles & Fields
Yunfeng Jiang, Jun-Bao Wu, Peihe Yang
Summary: This paper initiates the study of correlation functions between a single trace operator and a circular supersymmetric Wilson loop in ABJM theory. The paper explores the different types of supersymmetric Wilson loops in ABJM theory and shows that some of them correspond to tree-level integrable boundary states while others do not. For the integrable ones, the paper proves their integrability and obtains analytic formula for the overlaps. Examples of non-vanishing overlaps violating selection rules are also given.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Shojiro Kimura, Hiroaki Onishi, Akira Okutani, Mitsuru Akaki, Yasuo Narumi, Masayuki Hagiwara, Kouichi Okunishi, Koichi Kindo, Zhangzhen He, Tomoyasu Taniyama, Mitsuru Itoh
Summary: In this study, the selection rules of optical transitions in BaCo2V2O8 were clarified using high-field electron spin resonance measurement. It was found that unconventional magnetic excitation can couple with both magnetic and electric fields in the field-induced quantum critical state. This coupling mechanism is attributed to the periodic spin interactions and magnetoelectric coupling in BaCo2V2O8.
Article
Materials Science, Multidisciplinary
Parameshwar R. Pasnoori, Junhyun Lee, J. H. Pixley, Natan Andrei, Patrick Azaria
Summary: In this work, the spin-1/2 Heisenberg chain with boundary magnetic fields is studied using a combination of Bethe ansatz and density matrix renormalization group (DMRG) techniques. Different ground states and high-energy bound states are observed depending on the orientation and strength of the boundary magnetic fields. The number of towers in the Hilbert space also changes, indicating a boundary eigenstate phase transition (BEPT). The magnetization profile shows a qualitative change across the critical field. However, it is unclear if the observed phenomena correspond to a genuine phase transition in the ground state.
Article
Physics, Condensed Matter
Masanori Kohno
PHYSICA B-CONDENSED MATTER
(2018)
Review
Physics, Multidisciplinary
Masanori Kohno
REPORTS ON PROGRESS IN PHYSICS
(2018)
Article
Nanoscience & Nanotechnology
Masanori Kohno
Article
Physics, Multidisciplinary
Kimihiko Fukushima, Kazumitsu Sakai
PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS
(2019)
Article
Mathematics, Applied
Kohei Motegi, Kazumitsu Sakai, Satoshi Watanabe
JOURNAL OF GEOMETRY AND PHYSICS
(2020)
Article
Quantum Science & Technology
Ryo Asaka, Kazumitsu Sakai, Ryoko Yahagi
QUANTUM INFORMATION PROCESSING
(2020)
Article
Physics, Multidisciplinary
Kimihiko Fukushima, Kazumitsu Sakai
Summary: This study employs a deep CNN trained on spin configurations of the 2D Ising model to detect the phase transition of the 2D q-state Potts model with high accuracy. The CNN outputs temperatures based on internal energy in the high-temperature region and on magnetization and possibly internal energy in the low-temperature region. Near the transition point, the CNN may use more general factors to detect the transition point effectively.
PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS
(2021)
Article
Quantum Science & Technology
Ryo Asaka, Kazumitsu Sakai, Ryoko Yahagi
Summary: The novel concept of quantum random access memory (qRAM) uses a quantum walk and a bucket brigade scheme to efficiently access memory cells and fill them with desired information in the form of quantum superposition states. The design does not require quantum devices at binary tree nodes, allowing for reduced coherence maintenance costs and fully parallelized operations, accessing data with simpler structures.
QUANTUM SCIENCE AND TECHNOLOGY
(2021)
Article
Optics
Ryo Asaka, Kazumitsu Sakai, Ryoko Yahagi
Summary: This study implements a quantum random access memory (QRAM) using a multiparticle continuous-time quantum walk with two internal states. Data is dual-rail encoded and stored in quantum walkers that traverse perfect binary trees to access memory cells. The QRAM utilizes a roundabout gate as a router to move the walkers based on their internal states. The implementation is more efficient than conventional bucket-brigade QRAM and does not require time-dependent control.
Article
Optics
Ryo Asaka, Kazumitsu Sakai, Ryoko Yahagi
Summary: In this paper, we propose a model of universal quantum computation using a multiparticle continuous-time quantum walk. Information is converted using a dual-rail encoding, and a roundabout gate is developed to move the quantum walker between paths. The computation is done by passing quantum walkers through designed paths, without the need for time-dependent control.
Article
Materials Science, Multidisciplinary
Masanori Kohno
Article
Materials Science, Multidisciplinary
Masashi Hase, Vladimir Yu Pomjakushin, Lukas Keller, Uwe Stuhr, Andreas Donni, Masanori Kohno, Akihiro Tanaka
Proceedings Paper
Quantum Science & Technology
Kohei Motegi, Kazumitsu Sakai
32ND INTERNATIONAL COLLOQUIUM ON GROUP THEORETICAL METHODS IN PHYSICS (GROUP32)
(2019)
Article
Materials Science, Multidisciplinary
Masanori Kohno
Article
Materials Science, Multidisciplinary
Ryui Kaneko, Yoshihiko Nonomura, Masanori Kohno
