Article
Optics
Kai Yen Jee, Erich Mueller
Summary: Using kinetic theory, we modeled the dynamics of a small Bose condensed cloud of heavy particles moving through a larger degenerate Fermi gas of light particles. By varying the Bose-Fermi interaction, we observed a transition between bulk- and surface-dominated regimes. Our calculations of the dipole mode in a harmonic trap showed excellent agreement with experimental studies of Cs-Li mixtures, confirming the accuracy of our stochastic model.
Article
Optics
Khalid Hossain, Subhadeep Gupta, Michael McNeil Forbes
Summary: In this experiment, a ring geometry is used to directly detect the entrainment effect in a mixture of bosonic and fermionic superfluids. The choice of ring geometry eliminates variations in the mean-field interaction strength, enhancing the detection of entrainment-induced phase gradient.
Article
Optics
R. Guerrero-Suarez, J. J. Mendoza-Arenas, R. Franco, J. Silva-Valencia
Summary: We investigated an imbalanced mixture of two-color fermions and scalar bosons in the hard-core limit, considering repulsive and attractive interspecies and intraspecies interactions. The interplay between commensurability, repulsive interactions, and imbalance generates three insulating phases: a mixed Mott state and two spin-selective insulators characterized by specific commensurability relations. State-of-the-art cold-atom setups provide ideal platforms to implement these insulating states and verify their commensurability relations.
Article
Physics, Multidisciplinary
O. Hryhorchak, V Pastukhov
Summary: We investigate the equilibrium mean-field properties of a mixture composed of bosons and spin-polarized fermionic atoms in a system with a point-like interaction, where the dimension is between 2 and 4. In addition to the system's weak coupling limit, which involves a slightly depleted Bose condensate and an almost ideal Fermi gas, we discuss the (meta)stable phase characterized by dimers consisting of exactly one boson and one fermion. We elucidate the peculiar characteristics of the fermion-dimer and boson-dimer three-body effective interactions, and their effects on the thermodynamic stability of dilute Bose-Fermi mixtures.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
Article
Physics, Multidisciplinary
S. Bresolin, A. Roy, G. Ferrari, A. Recati, N. Pavloff
Summary: Close to the demixing transition, the degree of freedom associated with relative density fluctuations of a two-component Bose-Einstein condensate is described by a nondissipative Landau-Lifshitz equation. In the quasi-one-dimensional weakly immiscible case, this mapping surprisingly predicts that a dark-bright soliton should oscillate when subject to a constant force favoring separation of the two components. We propose a realistic experimental implementation of this phenomenon which we interpret as a spin -Josephson effect in the presence of a movable barrier.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Wen Wen, Lu Zhou, Zhenjun Zhang, Hui-jun Li
Summary: This article discusses the characteristics of the Bose-Fermi superfluid mixture and presents experimental evidence for unconventional behaviors. The orbital-free density functional theory is used to provide a theoretical explanation for these behaviors and predicts interesting phenomena for further experimental exploration.
Article
Materials Science, Multidisciplinary
Ken K. W. Ma, Kun Yang
Summary: The theory of composite fermion provides a simple and unified picture to understand a vast amount of phenomenology in the quantum Hall regime. Recently, a low-energy noncommutative field theory for bosons at Landau-level filling factor nu = 1 has been formulated, which reduces to the celebrated Halperin-Lee-Read theory in certain limits. In this work, a Bose-Fermi mixture at total filling factor nu = 1 is considered, and the number density and Fermi momentum of composite fermions can be tuned by changing the filling factor of bosons. In the dilute limit, the energy dispersion and effective mass of composite fermions can be calculated exactly, and the approximation of a commutative field theory is justified.
Article
Physics, Multidisciplinary
P. Naidon, D. S. Petrov
Summary: Repulsive Bose-Bose mixtures are known to either mix or phase separate into pure components. Here, a mixed-bubble regime is predicted, where bubbles of the mixed phase coexist with a pure phase of one of the components. This effect arises due to unequal masses or unequal intraspecies coupling constants, resulting in a competition between the mean-field term and a nonquadratic beyond-mean-field correction. Parameters of the mixed-bubble regime in all dimensions are identified and implications for current experiments are discussed.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
M. Pini, P. Pieri, R. Grimm, G. Calvanese Strinati
Summary: A detailed description of the phase diagram for a two-component unitary Fermi gas with mass and population imbalance is provided, aiming to offer quantitative benchmarks for the normal-to-superfluid phase transition in a temperature-polarization parameter space of a mass-imbalanced Fermi gas. The self-consistent t-matrix approach is adopted, known for accurately describing the thermodynamic properties of unitary Fermi gas with mass and population balance. The results serve as a guideline for ongoing experiments on heteronuclear Fermi mixtures.
Article
Physics, Multidisciplinary
Clemens Kuhlenkamp, Michael Knap, Marcel Wagner, Richard Schmidt, Atac Imamoglu
Summary: In this paper, we theoretically analyze a solid-state analog of Feshbach resonances in two-dimensional semiconductor heterostructures. By tuning the applied electric field, the scattering of excitons and electrons occupying different layers can be resonantly enhanced, leading to the formation of an interlayer Feshbach molecule. This discovery has potential implications for the realization of correlated Bose-Fermi mixtures in bilayer semiconductors.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Tran Duong Anh-Tai, Mathias Mikkelsen, Thomas Busch, Thomas Fogarty
Summary: We systematically study the emergence of quantum chaos in a minimal system of one-dimensional harmonically trapped Bose-Bose mixtures by tuning the particle-particle interactions. Using improved exact diagonalization scheme, we show that one can obtain strong signatures of chaos by increasing the inter-component interaction strength and breaking the symmetry of intra-component interactions.
Article
Physics, Multidisciplinary
G. Pascual, G. Spada, S. Pilati, S. Giorgini, J. Boronat
Summary: We study repulsive two-component Bose mixtures with equal populations and confined in a finite-size box through path-integral Monte Carlo simulations. Different behaviors are observed at different temperatures for different values of the s-wave scattering length of the interspecies potential.
PHYSICAL REVIEW RESEARCH
(2023)
Editorial Material
Chemistry, Physical
David A. Ruiz-Tijerina
Summary: Two studies investigate strongly correlated states of Bose-Fermi excitonic complexes in two different solid-state platforms, paving the way for tabletop quantum simulators.
Article
Physics, Multidisciplinary
G. Bougas, S. Mistakidis, P. Giannakeas, P. Schmelcher
Summary: The few-body correlations emerging in two-dimensional harmonically trapped mixtures were comprehensively investigated, revealing the formation of atom-dimer and trap states, in addition to trimers. The Tan's contacts of these eigenstates were studied, showing enhanced correlations in trimer states compared to other eigenstates. An upper bound was found in the two-body contact of atom-dimer and trap states, while no such bound existed in the three-body contact.
NEW JOURNAL OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
Tomohiro Tanaka, Yusuke Nishida
Summary: The study shows that one-dimensional Bose and Fermi gases exhibit weak-strong duality under contact interactions, extending beyond thermodynamics to the frequency-dependent complex bulk viscosity.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
S. Pilati, P. Pieri
SCIENTIFIC REPORTS
(2019)
Article
Physics, Multidisciplinary
M. Pini, P. Pieri, M. Jaeger, J. Hecker Denschlag, G. Calvanese Strinati
NEW JOURNAL OF PHYSICS
(2020)
Article
Materials Science, Multidisciplinary
M. Pini, P. Pieri, G. Calvanese Strinati
Summary: This study analyzes the evolution of an attractive polarized two-component Fermi gas at zero temperature as its polarization is gradually decreased from full polarization to a critical polarization where superfluidity occurs. The critical polarization and the associated superfluid instability are determined using a fully self-consistent t-matrix approach at zero temperature, constructing the polarization-vs-coupling phase diagram throughout the BCS-BEC crossover. The superfluid instability can lead to either a Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) phase or a standard polarized BCS phase depending on the interparticle interaction strength between the two components. The behavior of the quasiparticle parameters in the normal Fermi gas varies significantly between the two cases.
Article
Materials Science, Multidisciplinary
L. Pisani, P. Pieri, G. Calvanese Strinati
Summary: In this study, a systematic investigation is conducted on the two-particle reduced density matrix of a superfluid fermionic system undergoing the BCS-BEC crossover. The spatial dependence evolution of the reduced density matrix is obtained from a power law at low temperature to an exponential dependence at high temperature in the superfluid phase when the interparticle coupling spans the BCS-BEC crossover.
Article
Physics, Multidisciplinary
Michele Pini, Pierbiagio Pieri, Giancarlo Calvanese Strinati
Summary: In this study, the pair susceptibility of an attractive spin-polarized Fermi gas in the normal phase was calculated as a function of pair momentum. It was found that close to unitarity, there is a strong enhancement of FFLO pairing fluctuations, which could be observed experimentally as a pronounced peak in the pair-momentum distribution. The calculations were based on a self-consistent t-matrix approach and have been validated against experimental data for several thermodynamic quantities in the unitary balanced Fermi gas system.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Physics, Condensed Matter
Hiroyuki Tajima, Pierbiagio Pieri, Andrea Perali
Summary: This study investigates the single-particle excitation properties in the normal state of a two-band superconductor or superfluid, focusing on iron-based multiband superconductors and multicomponent fermionic superfluids. It shows how the pseudogap state in the shallow band is concealed by the deep band contribution throughout the two-band BCS-BEC crossover, potentially explaining the missing pseudogap in recent scanning tunneling microscopy experiments in FeSe superconductors.
Article
Optics
M. Pini, P. Pieri, R. Grimm, G. Calvanese Strinati
Summary: A detailed description of the phase diagram for a two-component unitary Fermi gas with mass and population imbalance is provided, aiming to offer quantitative benchmarks for the normal-to-superfluid phase transition in a temperature-polarization parameter space of a mass-imbalanced Fermi gas. The self-consistent t-matrix approach is adopted, known for accurately describing the thermodynamic properties of unitary Fermi gas with mass and population balance. The results serve as a guideline for ongoing experiments on heteronuclear Fermi mixtures.
Article
Materials Science, Multidisciplinary
Hiroyuki Tajima, Yuriy Yerin, Pierbiagio Pieri, Andrea Perali
Article
Physics, Fluids & Plasmas
S. Pilati, P. Pieri
Article
Physics, Fluids & Plasmas
S. Pilati, E. M. Inack, P. Pieri
Article
Materials Science, Multidisciplinary
Yuriy Yerin, Hiroyuki Tajima, Pierbiagio Pieri, Andrea Perali
Article
Materials Science, Multidisciplinary
Hiroyuki Tajima, Yuriy Yerin, Andrea Perali, Pierbiagio Pieri
Article
Materials Science, Multidisciplinary
S. Simonucci, P. Pieri, G. Calvanese Strinati
Article
Materials Science, Multidisciplinary
M. Pini, P. Pieri, G. Calvanese Strinati
Article
Physics, Condensed Matter
Hiroyuki Tajima, Andrea Perali, Pierbiagio Pieri