Article
Physics, Multidisciplinary
Federica Cataldini, Frederik Moller, Mohammadamin Tajik, Joao Sabino, Si-Cong Ji, Igor Mazets, Thomas Schweigler, Bernhard Rauer, Joerg Schmiedmayer
Summary: The relationship between many-body interactions and dimensionality is crucial for understanding emergent quantum phenomena. This study shows that one-dimensional physics can persist into the dimensional crossover towards three-dimensions more significantly than expected. The dominant relaxation mechanism in this system is identified as the one-dimensional dephasing of collective excitations, and it remains dominant even at temperatures exceeding conventional limits of one-dimensionality. The observations suggest that one-dimensional physics is less fragile than previously thought, as it can persist even in the presence of significant perturbations.
Article
Materials Science, Multidisciplinary
A. Camacho-Guardian, M. Bastarrachea-Magnani, T. Pohl, G. M. Bruun
Summary: This study investigates collisions between dark-state polaritons in three-level systems and discovers a resonant process that enhances the interactions between polaritons substantially. It provides a promising approach for quantum nonlinear optics.
Article
Mathematics, Applied
Matias G. Delgadino, Rishabh S. Gvalani, Grigorios A. Pavliotis
Summary: The article analyses the statistical behavior of a large number of weakly interacting diffusion processes evolving under a periodic interaction potential, focusing on the combined mean field and diffusive limits. Results show that these limits do not commute if the mean field system constrained to the torus undergoes a phase transition. A typical example of such a system on the torus is the noisy Kuramoto model of mean field plane rotators.
ARCHIVE FOR RATIONAL MECHANICS AND ANALYSIS
(2021)
Article
Physics, Multidisciplinary
Ming-Cheng Liang, Zhi-Xing Lin, Yang-Yang Chen, Xi-Wen Guan, Xibo Zhang
Summary: In this study, power-law scalings of thermodynamic observables in low-dimensional interacting Bose gases at quantum criticality were found. A physical picture was proposed to explain the competition between kinetic and interaction energy scales when the repulsive interaction strength approaches zero. These results have important implications for understanding many-body phenomena induced by weak interactions in quantum gases.
FRONTIERS OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Xin-Yuan Gao, D. Blume, Yangqian Yan
Summary: This work investigates the finite-temperature loss rate of single-component Fermi gases with weak interactions, and validates the applicability of the theoretical model through experimental results.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Shun Uchino
Summary: This study uncovers the current-bias characteristics of superfluid-normal state junctions with weakly-interacting Bose gases. It is found that when a chemical potential bias is present, the characteristics can strongly exhibit asymmetry of origin. The absence of a salient feature in the fermionic counterpart is attributed to a tunneling process associated with a condensate and a bosonic Andreev reflection process. These processes are inherently nonlinear and therefore do not follow Ohm's law even at low bias. In addition, the remaining processes are found to obey Ohm's law and become dominant for transport driven by a temperature bias.
Article
Physics, Multidisciplinary
P. T. Song
Summary: This study investigates the quantum fluctuation of a weakly interacting Bose gas confined between two parallel plates at zero temperature within the two-loop approximation of the Cornwall-Jackiw-Tomboulis (CJT) effective action approach. The effects of finite size and boundary conditions on the excitation atomic density, energy density, chemical potential, and sound speed are determined, including the prediction of a first-order phase transition phenomenon.
Article
Physics, Multidisciplinary
P. T. Song
Summary: The Casimir effect in a mixture of two components weakly interacting Bose-Einstein condensates (BECs) is investigated using the two-loop approximation of the Cornwall-Jackiw-Tomboulis (CJT) effective action approach at zero temperature. The formulae for the Casimir energy and the resulting Casimir force, incorporating boundary condition (BC) and mixture effects, are derived for immiscible and miscible phases. The theoretical predictions explore the origin of BC's influence on the Casimir effect and the behavior transition of the Casimir force.
Article
Physics, Multidisciplinary
C. D. Mink, A. Pelster, J. Benary, H. Ott, M. Fleischhauer
Summary: The truncated Wigner approximation is a method for describing the dynamics of weakly interacting Bose gases. In this paper, a numerically inexpensive scheme is developed by approximating the c-number field, and its accuracy and efficiency are demonstrated by comparing predictions to experimental data.
Article
Computer Science, Artificial Intelligence
Ting Zhang, Muhammad Waqas, Yu Fang, Zhaoying Liu, Zahid Halim, Yujian Li, Sheng Chen
Summary: This paper proposes a weakly-supervised butterfly detection model based on a saliency map (WBD-SM) to enhance the accuracy of butterfly detection in the ecological environment. Experimental results show that WBD-SM achieves higher recognition accuracy than VGG16 under different division ratios.
PATTERN RECOGNITION
(2023)
Article
Physics, Multidisciplinary
D. M. Gitman, D. A. Ivanov, A. F. de Souza
Summary: Examining the causal propagator for Dirac particles interacting with electromagnetic fields and matter fields leads to a path integral representation allowing effective calculation of the propagator and quantum currents. The interpretation of the action as a pseudoclassical action for Dirac particles is justified by the Dirac equation appearing as a quantum equation of motion in the constructed quantum mechanics. Pseudoclassical equations of motion in the nonrelativistic limit offer a nontrivial generalization of Pauli quantum mechanics with an external electromagnetic field.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Physics, Mathematical
Simone Rademacher, Robert Seiringer
Summary: This paper investigates the many-body dynamics of an initially factorized bosonic wave function in the mean-field regime. Large deviation estimates for the fluctuations around the condensate are proven. An upper bound is derived, extending a recent result to more general interactions. Furthermore, a new lower bound is derived, which agrees with the upper bound in leading order.
JOURNAL OF STATISTICAL PHYSICS
(2022)
Article
Physics, Multidisciplinary
Yuxuan Zhang, Naren Manjunath, Gautam Nambiar, Maissam Barkeshli
Summary: In the presence of crystalline symmetries, this study investigates a particular invariant, the discrete shift 6', in the square lattice Hofstadter model. The results show that 6' is related to quantized contributions to fractional charge and angular momentum. The study also proposes an empirical formula for 6' and shows that bands with the same Chern number may have different values of 6'.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Kyung Seok Woo, Jaehyun Kim, Janguk Han, Woohyun Kim, Yoon Ho Jang, Cheol Seong Hwang
Summary: As the field of big data continues to expand, a computing scheme that can solve complex tasks is necessary. Probabilistic computing, which uses probabilistic bits to efficiently handle problems, is proposed in this study. The theoretical background of the computing system is introduced, and a network of probabilistic bits is formed using a memristor-based threshold switching behavior. The memristor-based probabilistic computing enables all 16 Boolean logic operations, showing potential for complex operations.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Sandro Donadi, Luca Ferialdi, Angelo Bassi
Summary: Noninterferometric experiments have successfully constrained models of spontaneous wave function collapse, which violate the quantum superposition principle for large systems. These experiments demonstrate that the dynamics driven by noise not only collapses the wave function, but also generates diffusive motion with characteristic signatures that can be tested. It is shown that under reasonable assumptions, any collapse dynamics in space is diffusive, regardless of the specific model that implements the collapse.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Saien Xie, Brendan D. Faeth, Yanhao Tang, Lizhong Li, Eli Gerber, Christopher T. Parzyck, Debanjan Chowdhury, Ya-Hui Zhang, Christopher Jozwiak, Aaron Bostwick, Eli Rotenberg, Eun-Ah Kim, Jie Shan, Kin Fai Mak, Kyle M. Shen
Summary: By studying WS2/WSe2 moire superlattices and graphene/WS2/WSe2 trilayer heterostructures, we discovered that the hybridization of moire bands in WS2/WSe2 exhibits an unusually large momentum dependence, and the same WS2/WSe2 superlattice can imprint an unexpectedly large moire potential on a separate layer of graphene.
Review
Physics, Multidisciplinary
Debanjan Chowdhury, Antoine Georges, Olivier Parcollet, Subir Sachdev
Summary: This review focuses on the Sachdev-Ye-Kitaev (SYK) model and its relevance to nonFermi liquids in condensed matter physics. The study explores the phase diagrams of models with local electronic correlations, which display SYK physics. It also investigates the connection between the SYK model and theories of sharp Fermi surfaces without quasiparticles. Furthermore, the review provides an overview of the links between the SYK model and quantum gravity.
REVIEWS OF MODERN PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Johannes S. Hofmann, Debanjan Chowdhury, Steven A. Kivelson, Erez Berg
Summary: This article discusses the limits of the superconducting transition temperature (T-c) based on various heuristic upper bounds. It shows that these bounds, although physically motivated and useful in many cases, do not serve as a fundamental limit for T-c.
NPJ QUANTUM MATERIALS
(2022)
Article
Physics, Multidisciplinary
Yi-Ming Wu, P. A. Nosov, Aavishkar A. Patel, S. Raghu
Summary: We describe and solve models with robust PDW phases, finding that the requirements for long-range PDW order are nonmonotonic repulsive BCS couplings in space and their strength exceeding a threshold value.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Sunghoon Kim, Adhip Agarwala, Debanjan Chowdhury
Summary: It is found that many topological characteristics of free fermions survive even in an amorphous setting. This study extends these findings by incorporating the effect of strong repulsive interactions on topology and other correlation induced phenomena. The results show the existence of strongly interacting amorphous analogs of crystalline Mott insulating phases with nontrivial chiral neutral edge modes, as well as a fractionalized Anderson insulating phase.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Sunghoon Kim, T. Senthil, Debanjan Chowdhury
Summary: Recent experiments in moire ' transition metal dichalcogenide materials have observed a continuous bandwidth-tuned transition from a metal to a paramagnetic Mott insulator at a fixed filling of one electron per moire ' unit cell. However, the electrical transport measurements show puzzling features that contradict theoretical expectations. In this Letter, the effects of long-wavelength inhomogeneities are considered, and the results are compared with previous clean limit models, highlighting the differences from a simple percolation-based picture.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Johannes S. Hofmann, Erez Berg, Debanjan Chowdhury
Summary: In this study, we use quantum Monte Carlo simulations to investigate the behavior of an electronic model with topologically trivial flat bands. We find that by manipulating the electron filling and the spatial extent of the localized flat-band Wannier wave functions, different intertwined order parameters can emerge, including a phase with coexisting charge density wave order and superconductivity, known as a supersolid. Despite the complexity of the problem, we are able to identify a limit associated with the Wannier functions and derive an effective low-energy Hamiltonian that accurately describes our numerical results. Our findings also provide evidence for the violation of a presumed lower bound on the zero-temperature superfluid stiffness in geometrically nontrivial flat bands.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Dan Mao, Debanjan Chowdhury
Summary: Superconductivity is the macroscopic manifestation of quantum phenomena where electrons form pairs and exhibit long-range phase coherence. Understanding the mechanisms underlying the limit of superconducting transition temperature, Tc, has been a long-standing challenge. In this study, we propose a theoretical framework to compute the electromagnetic response for generic model Hamiltonians without using mean-field approximation, which determines the maximum phase stiffness and Tc. Our computations reveal that the phase stiffness is contributed by integrating out remote bands and density-density interactions projected on isolated narrow bands.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Multidisciplinary Sciences
Aavishkar A. Patel, Haoyu Guo, Ilya Esterlis, Subir Sachdev
Summary: This study considers the coupling of two-dimensional metals with quantum critical scalars and finds that these metals exhibit strange metal behavior at low temperatures, characterized by a linear resistivity and a specific heat that follows a T ln(1/T) relationship. The study also provides an explanation for the theoretical bound on the transport scattering time.
Article
Multidisciplinary Sciences
Stephen J. Thornton, Danilo B. Liarte, Peter Abbamonte, James P. Sethna, Debanjan Chowdhury
Summary: Recent experiments have discovered unusual features in the dynamical charge response of strange metals, such as momentum-independent continuum of excitations and unconventional plasmon decay. In this study, the authors propose a phenomenological theory based on the analogy to classical fluids near a jamming-like transition. By comparing with experimental measurements, they find that this theory can reproduce many of the qualitative features observed in strange metals.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Adam J. McRoberts, J. F. Mendez-Valderrama, Roderich Moessner, Debanjan Chowdhury
Summary: We study the scattering of electrons off the spin fluctuations of a geometrically frustrated antiferromagnet at intermediate temperatures. The fluctuating local moments lead to an angular anisotropy of the scattering rate along the Fermi surface, which disappears with increasing temperature. At intermediate and high temperatures, the electronic properties can be described using a local approximation for the dynamical spin response, contrasting with the behavior of electrons scattering off classical phonons.
Article
Materials Science, Multidisciplinary
Xuepeng Wang, Debanjan Chowdhury
Summary: Recent spectroscopic measurements have discovered evidence of anomalous frequency and momentum-dependent charge-density fluctuations in strongly correlated metals that exhibit non-Fermi-liquid-like properties. These measurements suggest that the decay of the plasmon mode into a featureless particle-hole continuum in cuprate superconductors is distinct from the expectations of conventional Fermi liquid theory. Theoretical analysis of solvable lattice models of non-Fermi liquids with a critical Fermi surface provides insights into the nature of low-energy collective modes and particle-hole continua.
Article
Materials Science, Multidisciplinary
Haoyu Guo, Aavishkar A. Patel, Ilya Esterlis, Subir Sachdev
Summary: This study describes the coupling of Fermi surface with a scalar field using a 1/N expansion, computes the conductivity of the system in two spatial dimensions for a critical scalar, and finds a Drude contribution as well as the vanishing coefficient of the proposed 1/omega(2/3) contribution to the optical conductivity at frequency omega for a convex Fermi surface. The study also investigates the influence of impurity scattering on the fermions and observes that while the self-energy resembles a marginal Fermi liquid, the resistivity and optical conductivity behave like a Fermi liquid.
Article
Physics, Fluids & Plasmas
Danilo B. Liarte, Stephen J. Thornton, Eric Schwen, Itai Cohen, Debanjan Chowdhury, James P. Sethna
Summary: In this study, the researchers investigated the singular dynamical response of interacting liquids transitioning to a disordered solid, deriving scaling forms and extracting critical exponents, invariant scaling combinations, and analytical formulas for universal scaling functions near these transitions using effective-medium theory. Their scaling forms describe the behavior in space and time near the onsets of rigidity, including diverging length scales and timescales at the transitions for rigid and floppy phases and the crossover region.
Article
Materials Science, Multidisciplinary
Erik E. Aldape, Tessa Cookmeyer, Aavishkar A. Patel, Ehud Altman
Summary: The article introduces an effective theory for describing quantum critical points in heavy-fermion systems, capturing a strongly coupled metallic QCP within a controlled large-N limit. The theory demonstrates robust Fermi-liquid transport phenomenology and Planckian transport lifetime in the parameter regime of strong damping of emergent bosonic excitations.
