Article
Physics, Multidisciplinary
Bugra Tuzemen, Tomasz Zawislak, Gabriel Wlazlowski, Piotr Magierski
Summary: We investigate the properties of spin-imbalanced ultracold Fermi gas at low temperatures over a wide range of spin polarizations. We employ microscopic calculations using mean-field and density functional theory approaches without any symmetry constraints. At low polarization values, the system is predicted to consist of multiple spin-polarized droplets. As the polarization increases, the system self-organizes into disordered structures resembling liquid crystals and can energetically compete with ordered structures like grid-like domain walls. Further increasing polarization leads to the development of regularities that can be considered as supersolid, where periodic density modulation and pairing correlations coexist. The robustness of the results has been verified against temperature effects, dimensionality, and the presence of a trapping potential. Dynamical stability has also been investigated.
NEW JOURNAL OF PHYSICS
(2023)
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, Multidisciplinary
Duncan Neill, Rebecca Preston, William G. Newton, David Tsang
Summary: Efforts have been made to measure the nuclear symmetry energy through neutron star and nuclear observables. However, these observables like radii and tidal deformability may not accurately constrain properties of nucleonic matter due to the possible presence of nonhadronic matter in the neutron star core. By performing consistent inference using both astrophysical and nuclear data, it has been found that the coincident timing of a resonant shattering flare and gravitational wave signal during binary neutron star inspiral can probe the crust-core transition region and provide constraints on the symmetry energy comparable to terrestrial nuclear experiments. Different observables, such as nuclear masses, resonant shattering flares, and measurements of neutron star radii and tidal deformabilities, can constrain different density ranges of the equation of state, complementing each other.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Jaroslaw Ryszkiewicz, Miroslaw Brewczyk, Tomasz Karpiuk
Summary: We developed a model for a binary fermionic mixture applicable at nonzero temperatures in the normal phase, and used it to study the dynamics of degenerate Fermi systems under various perturbations. The results show that the ferromagnetic phase appears at higher temperatures and stronger repulsion between the components.
Article
Physics, Multidisciplinary
Jian Feng, Wei-Wei Zhang, Liang-Wei Lin, Qi-Peng Cai, Yi-Cai Zhang, Sheng-Can Ma, Chao-Fei Liu
Summary: This paper investigates the topological superfluid phase diagram of a two-dimensional mass-imbalanced Fermi gas with Rashba spin-orbit coupling at zero temperature. The study finds a double-well structure in the thermodynamic potential due to the competition among mass imbalance, pairing interaction, and spin-orbit coupling, which affects the properties of the ground state. The phase diagrams are provided on the plane of spin-orbit coupling and chemical potential, as well as the plane of reduced mass ratio and two-body binding energy, offering a theoretical basis for better observation of topological superfluid state in experiments.
Article
Physics, Applied
Ti-Wei Xue, Zeng-Yuan Guo
Summary: In this paper, an ideal dense matter equation of state (EOS) that is symmetric to the ideal gas EOS is proposed. The ideal dense matter EOS makes no assumptions about the structure of matter and is general. By studying specific work and physical constants, it is found that the ideal dense matter EOS has the same theoretical location as the ideal gas EOS.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Engineering, Chemical
Bennett D. Marshall, J. R. Johnson
Summary: In this paper, a new model is proposed to predict the pervaporation separation of solvent mixtures using glassy polymer membranes. The model is based on the diffusion theory of Maxwell-Stefan diffusion with a concentration gradient driving. The approach combines the perturbed-chain statistical associating fluid theory (PC-SAFT) and the dry glass reference perturbation theory (DGRPT) to evaluate the solubilities of guest species in the membrane. The model demonstrates accurate predictions of pervaporation for binary solvent mixtures and has the potential for implementation in process simulators.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Physics, Fluids & Plasmas
Markus Kulossa, Philipp Marienhagen, Joachim Wagner
Summary: This study provides the second to sixth-order virial coefficients of hard hyperspherocylinders in four dimensions, and compares them with the geometric calculations based on the aspect ratio.
Article
Physics, Multidisciplinary
Yusen Yang, Qian Tao, Yuqiang Fang, Guoxiong Tang, Chao Yao, Xiaoxian Yan, Chenxi Jiang, Xiangfan Xu, Fuqiang Huang, Wenxin Ding, Yu Wang, Zhiqiang Mao, Hui Xing, Zhu-An Xu
Summary: A strange-metal state, which appears in many strongly correlated materials, has been studied to understand its nature and properties. In this study, a large Nernst response is observed in a two-dimensional superconductor 2M-WS2, suggesting a change in carrier entropy when entering the strange-metal state. This anomalous Nernst response is further confirmed in other iconic strange metals, indicating its universality and providing experimental constraints on the mechanism of strange metals.
Article
Physics, Multidisciplinary
Constantine Shkedrov, Meny Menashes, Gal Ness, Anastasiya Vainbaum, Ehud Altman, Yoav Sagi
Summary: Ultracold atomic gas is a useful tool for studying many-body physics. Floquet engineering, a recent addition to the experimental toolbox, creates effective potentials through periodic modulation of the Hamiltonian. However, external modulations can lead to energy absorption and heating in many-body systems. This study shows that Floquet engineering can be applied to a strongly interacting fermionic gas without inducing excessive heating. The results provide insight into the behavior of driven many-body systems and have potential implications for exploring exotic phases of strongly interacting fermions.
Article
Physics, Multidisciplinary
Ipsita Mandal
Summary: The quantum Boltzmann equation (QBE) for non-Fermi liquid systems is derived using generalized Landau-interaction parameters obtained through the nonequilibrium Green's function technique. This study provides a general framework for investigating collective excitations in non-Fermi liquid systems.
Article
Physics, Multidisciplinary
Heron Caldas, S. Rufo, M. A. R. Griffith
Summary: The effects of impurities on the induced interactions corrections are detrimental for the transition temperature and tricritical point in both balanced and imbalanced Fermi gases. Impurities strongly suppress particle-hole fluctuations for large impurity parameter. The Chandrasekhar-Clogston limit of an imbalanced Fermi gas with induced interactions has been determined for both pure and impure regimes at unitarity.
ANNALEN DER PHYSIK
(2022)
Article
Astronomy & Astrophysics
Francesca Calore, Pierluca Carenza, Christopher Eckner, Tobias Fischer, Maurizio Giannotti, Joerg Jaeckel, Kei Kotake, Takami Kuroda, Alessandro Mirizzi, Francesco Sivo
Summary: Axion-like particles (ALPs) can be abundantly produced in core-collapse supernovae (SNe), creating a diffuse flux peaked at energies of about 25 MeV. By improving the modeling of the ALPs flux, this study reveals the spatial morphology of the signal can follow the shape of the Galactic magnetic field. Utilizing 12 years of Fermi-LAT data, the analysis provides an upper limit for the coupling strength of ALPs to photons, while also assessing the uncertainty caused by systematic deviations from the benchmark scenario.
Article
Astronomy & Astrophysics
Marton Lajer, Robert M. Konik, Robert D. Pisarski, Alexei M. Tsvelik
Summary: This article analyzes the behavior of quarks coupled to a SU(N-c) gauge theory and explores the scenarios under strong coupling and nonzero density. The findings suggest that, under certain conditions, the dominant excitations near the Fermi surface are gapless bosonic modes rather than baryons.
Article
Multidisciplinary Sciences
Jiawei Wang, Jiebin Niu, Bin Shao, Guanhua Yang, Congyan Lu, Mengmeng Li, Zheng Zhou, Xichen Chuai, Jiezhi Chen, Nianduan Lu, Bing Huang, Yeliang Wang, Ling Li, Ming Liu
Summary: In this study, the nonlinear charge transport in conducting polymers was investigated by varying the crystalline degrees of samples. A heterogeneous-resistive-network model based on the link between Fermi liquids and Luttinger liquids was proposed to explain the nonlinear transport behaviors. The model was supported by precise electrical and microstructural characterizations, providing new insights into microstructure-correlated charge transport in organic solids.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Y. Hou, J. E. Drut
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Multidisciplinary
Adam Richie-Halford, Joaquin E. Drut, Aurel Bulgac
PHYSICAL REVIEW LETTERS
(2020)
Review
Physics, Multidisciplinary
C. E. Berger, L. Rammelmueller, A. C. Loheac, F. Ehmann, J. Braun, J. E. Drut
Summary: This paper reviews the theory and applications of complex stochastic quantization in the quantum many-body problem, covering various methods to address the sign problem. It discusses the mathematical foundations, provides pedagogical examples, and summarizes the challenges and practical solutions in the complex case. Additionally, recent applications of complex Langevin to quantum field theory are reviewed, with a focus on the nonrelativistic case.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2021)
Article
Physics, Condensed Matter
Aleks J. Czejdo, Joaquin E. Drut, Yaqi Hou, Kaitlyn J. Morrell
Summary: This article presents an automated algebraic method for calculating high-order virial coefficients, providing insights into the thermodynamics of quantum many-body systems in dilute regimes.
Article
Astronomy & Astrophysics
Jens Braun, Benedikt Schallmo
Summary: This study estimates the phase structure at zero temperature of dense isospin-asymmetric matter with two quark flavors using constraints from the microscopic theory of the strong interaction. It finds indications of a first-order phase transition from a color-superconducting phase to an ungapped quark-matter phase as the density increases, with this transition absent in isospin-symmetric matter. The study also provides an estimate for the speed of sound in neutron-star matter, which exceeds the asymptotic value associated with noninteracting quark gas and increases toward lower densities.
Article
Astronomy & Astrophysics
Adrian Koenigstein, Martin J. Steil, Nicolas Wink, Eduardo Grossi, Jens Braun
Summary: By reformulating the renormalization group flow equations as nonlinear heat equations, this study demonstrates the implications of dissipative character and irreversibility in RG flows. The existence of a C-/A-function is proposed to be linked to the dissipative character of RG flows and entropy production. The asymmetry in RG time and the interpretation of infrared actions as equilibrium solutions are discussed. Numerical entropy production is directly linked to irreversibility and the analysis of partial differential equations (PDEs).
Article
Astronomy & Astrophysics
Adrian Koenigstein, Martin J. Steil, Nicolas Wink, Eduardo Grossi, Jens Braun, Michael Buballa, Dirk H. Rischke
Summary: The functional renormalization group (FRG) approach is a powerful tool used in various fields to study different systems. This study introduces a novel method to solve flow equations using the analogy between RG equations and fluid dynamics. By applying this analogy to zero-dimensional quantum-field theoretical models, insights into RG flows and their interpretation, as well as the irreversibility of RG flows, can be gained. Additionally, numerical techniques developed in fluid dynamics can be applied to solve RG equations, allowing for the treatment of nonanalytic behavior in the RG flow.
Article
Optics
Felipe Attanasio, Lukas Rammelmueller, Joaquin E. Drut, Jens Braun
Summary: We nonperturbatively study the pairing behavior in high-temperature polarized two-component Fermi gases and analyze the pair-momentum distribution and shot-noise correlations. The results suggest that the dominant pairing patterns above the superfluid transition also govern the formation of condensates in the low-temperature regime.
Article
Astronomy & Astrophysics
Jens Braun, Benedikt Schallmo
Summary: We study the emergence of color superconductivity in high density strong-interaction theory, analyzing the behavior and scaling properties of diquark states and couplings. Our results suggest the existence of a maximum speed of sound at supranuclear densities.
Article
Astronomy & Astrophysics
Jens Braun, Timon Doernfeld, Benedikt Schallmo, Sebastian Toepfel
Summary: The study of dense relativistic matter is complicated and important in understanding its phase structure and thermodynamics. The introduction of regulator functions and discussion of regularization schemes are key components in the research process.
Article
Physics, Multidisciplinary
Y. Hou, K. J. Morrell, A. J. Czejdo, J. E. Drut
Summary: By extending the automated algebra approach to harmonically trapped systems, this study calculated the fourth- and fifth-order virial coefficients of universal spin-1/2 fermions in the unitary limit, showing favorable comparisons with previous Monte Carlo calculations and estimates in the untrapped limit. Additionally, estimates for contributions from subspaces with varying polarization were provided, and the results were used to calculate the compressibility and spin susceptibility using resummation techniques.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Optics
Lukas Rammelmueller, Yaqi Hou, Joaquin E. Drut, Jens Braun
Summary: We theoretically study the pairing behavior of the unitary Fermi gas in the normal phase, with analysis based on spin susceptibility response to an external magnetic field. Our findings are discussed in context of the phase diagram of the spin-polarized unitary Fermi gas.
Article
Physics, Multidisciplinary
Bing-Nan Lu, Ning Li, Serdar Elhatisari, Dean Lee, Joaquin E. Drut, Timo A. Laehde, Evgeny Epelbaum, Ulf-G Meissner
PHYSICAL REVIEW LETTERS
(2020)
Article
Optics
C. E. Berger, K. J. Morrell, J. E. Drut
Article
Optics
J. R. McKenney, A. Jose, J. E. Drut
