Article
Materials Science, Multidisciplinary
Ruipeng Li, Jonas von Milczewski, Atac Imamoglu, Rafal Oldziejewski, Richard Schmidt
Summary: We study induced pairing between two identical fermions mediated by an attractively interacting quantum impurity in two-dimensional systems. Based on a stochastic variational method (SVM), we investigate the influence of confinement and finite interaction range on the ground state of the quantum three-body problem. We find that confinement and a finite interaction range can enhance trimer stability and overcome Coulomb repulsion, opening possibilities for electron pairing beyond conventional paradigms.
Article
Optics
Cheng Peng, Ruijin Liu, Wei Zhang, Xiaoling Cui
Summary: In this study, the physics of Fermi polarons and molecules have been explored using a unified variational Ansatz, confirming the existence of a first-order transition in 3D and 2D Fermi polarons. The nature of this transition is determined by an energy competition between systems with different momenta. Additionally, different variational methods have been used to study the nature of the polaron-molecule transition in 2D systems, with consistent conclusions reached.
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
Chemistry, Multidisciplinary
Koloman Wagner, Zakhar A. Iakovlev, Jonas D. Ziegler, Marzia Cuccu, Takashi Taniguchi, Kenji Watanabe, Mikhail M. Glazov, Alexey Chernikov
Summary: This study demonstrates the diffusion of excitons in a monolayer semiconductor with a continuously tunable Fermi sea of free charge carriers. The light emission from tightly bound exciton states in electrically gated WSe2 monolayer is detected using microscopy. The measurements reveal a nonmonotonic dependence of the exciton diffusion coefficient on the charge carrier density.
Article
Optics
B. Abeln, K. Sponselee, M. Diem, N. Pintul, K. Sengstock, C. Becker
Summary: In this study, interisotope interorbital interactions between atoms in Yb-171 and Yb-173 mixture were characterized. The elastic interaction between Yb-173(e)-Yb-171(g) and Yb-173(g)-Yb-171(e) was found to be weakly attractive, with different two-body decay coefficients. By comparing different spin mixtures, the SU(2)⨂SU(6) symmetry of the elastic interactions was experimentally demonstrated. Additionally, the interorbital spin-exchange interaction in Yb-171 was measured and confirmed to be antiferromagnetic.
Article
Physics, Multidisciplinary
Y. -R Shi, Y. -R Wang, K. -Y Gao, W. Zhang
Summary: We study the dimensional crossover from anisotropically trapped three-dimensional to quasi-two-dimensional (quasi-2D) or quasi-one-dimensional (quasi-1D) configurations in the polaron problem of an impurity immersed in a Fermi sea. By calculating the ground-state energy in a wide range of interaction strength, we find that tighter confinement and lighter impurity mass prefer the polaron phase in lower dimensions. We also observe that a strictly low-dimensional system with all particles in the ground state cannot explain the polaron-molecule transition due to significant population of excited levels.
Article
Materials Science, Multidisciplinary
Joseph Kleinhenz, Igor Krivenko, Guy Cohen, Emanuel Gull
Summary: This article describes an experiment on the Kondo cloud, where the researchers examined the extent of the cloud in 1D by measuring the effect of nearby electrostatic perturbations on T-K. They also observed the Kondo state in the local density of states of the leads and made detailed predictions for future experiments.
Article
Optics
Esben Rohan Christensen, Arturo Camacho-Guardian, Georg M. Bruun
Summary: This study explores the properties of a mobile ion immersed in a quantum degenerate gas of fermionic atoms, revealing distinct characteristics of ionic Fermi polarons compared to neutral polaron. Ionic polarons exhibit multiple stable states and smooth transitions from repulsive to attractive with increasing interaction strength. Interestingly, the residue of the ionic polaron increases with Fermi density, which contrasts with the behavior of neutral polarons.
Article
Multidisciplinary Sciences
Daniele Guerci, Jie Wang, Jiawei Zang, Jennifer Cano, Andrew Millis
Summary: We theoretically investigate the interaction between magnetism and a heavy Fermi liquid in the AB-stacked transition metal dichalcogenide bilayer system MoTe2/WSe2. The interlayer electron transfer leads to a chiral Kondo exchange, resulting in a strong dependence of the Kondo temperature on carrier concentration and anomalous Hall effect due to topological hybridization gap. Our findings provide concrete experimental predictions for ongoing experiments on MoTe2/WSe2 bilayer heterostructures and offer a controlled route to observe a topological selective Mott transition.
Article
Optics
L. A. Pena Ardila
Summary: The study investigates the nonequilibrium dynamics of an impurity coupled to a Bose-Einstein condensate, comparing it with recent experimental results. Analytical expressions for the time-dependent contrast are derived for weak coupling, matching previous findings. The variational ansatz provides a quantitative description of polaron dynamics in strong coupling, especially in signaling the transition from few- to many-body correlated regime where polarons are expected to form.
Article
Materials Science, Multidisciplinary
Janik Schoenmeier-Kromer, Lode Pollet
Summary: We investigate the phase diagram of a one-dimensional Bose-Fermi-Hubbard model with scalar bosons at unit filling and S=1/2 fermions at half filling using quantum Monte Carlo simulations. The fermion-fermion interaction is set to zero. The main focus of our study is to understand the induced interactions between the fermions by the bosons, both for weak and strong interspecies coupling. We find that these induced interactions can result in competing instabilities favoring phase separation, superconducting phases, and density wave structures, often occurring on length scales of more than 100 sites. Additionally, we observe marginal bosonic superfluids with faster decay of the density matrix compared to pure bosonic systems with on-site interactions.
Article
Multidisciplinary Sciences
Ruwan Senaratne, Danyel Cavazos-Cavazos, Sheng Wang, Feng He, Ya-Ting Chang, Aashish Kafle, Han Pu, Xi-Wen Guan, Randall G. Hulet
Summary: Confining ultracold atoms to periodic potentials is a powerful method for simulating complex many-body systems. In this study, we confined fermions to one dimension to realize the Tomonaga-Luttinger liquid model and observed a velocity shift of spin and charge excitations in opposite directions, indicating the existence of spin-charge separation.
Article
Physics, Multidisciplinary
Mateus C. P. dos Santos, Wesley B. Cardoso
Summary: In this paper, a degenerate Fermi gas strongly confined in the transverse direction by a singular potential is studied. A one-dimensional effective equation is derived from a three-dimensional mean-field model using a variational approximation, which accurately describes the behavior of the particle distribution in the longitudinal direction. Systematic simulations confirm the reliability of the effective equation in describing the axial behavior of the tube-shaped Fermi gas in both attractive and repulsive regimes. Additionally, the 1D effective equation is found to be the best approximation for describing the periodic oscillations of the wave function in a dynamically changing potential.
Article
Chemistry, Physical
Tiago de Sousa Araujo Cassiano, Pedro Henrique de Oliveira Neto, Geraldo Magela Silva
Summary: This paper proposes a simplified model to simulate charge transport in cove-type heterojunctions by considering nanoribbons as one-dimensional polymers. The results indicate that the electron-phonon constant and sites' masses can vary depending on the nanoribbon structure. This approach provides a clearer picture to investigate the effects of junction formation on charge transport.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Thomas G. Kiely, Erich J. Mueller
Summary: The study focused on superfluidity in the one-dimensional Bose-Hubbard model, determining superfluid density by calculating energy cost in the thermodynamic limit, observing power-law decay of correlation functions, and the relationship between entanglement entropy and bond dimension. Comparison of two algorithms optimization algorithms was conducted, explaining the efficiency difference between VUMPS and iDMRG, and discussing the potential realization in cold-atom experiments.
Editorial Material
Multidisciplinary Sciences
Austen Lamacraft
News Item
Physics, Multidisciplinary
Austen Lamacraft
Article
Optics
Austen Lamacraft
Article
Optics
Manas Kulkarni, Austen Lamacraft
Article
Optics
Austen Lamacraft
Article
Materials Science, Multidisciplinary
Tom Price, Austen Lamacraft
Article
Physics, Multidisciplinary
M. Schecter, A. Kamenev, D. M. Gangardt, A. Lamacraft
PHYSICAL REVIEW LETTERS
(2012)
Article
Physics, Multidisciplinary
Pieter W. Claeys, Austen Lamacraft
Summary: Dual-unitary quantum circuits can be used to construct lattice models for calculating dynamical correlations of local observables. The study presents analytical methods for constructing dual-unitary circuits with different levels of ergodicity/non-ergodicity and provides results on thermalization to infinite-temperature Gibbs state and generalized Gibbs ensemble, showing the addition of tunable perturbations can lead to prethermalization plateaux for local observables without breaking dual unitarity.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Francisco Vargas, Pierre Thodoroff, Austen Lamacraft, Neil Lawrence
Summary: The Schrodinger bridge problem involves the most likely stochastic evolution between two probability distributions and has important applications in machine learning. We propose a numerical method to estimate SBPs and demonstrate its practical usage in experiments.
Article
Physics, Multidisciplinary
Pieter W. Claeys, Austen Lamacraft, Jonah Herzog-Arbeitman
Summary: Recent studies have found that the dynamics of spin in the spin-1/2 Heisenberg chain at finite temperature exhibits superdiffusion. This study examines spin transport in a spin-1/2 chain with fluctuating exchange couplings and finds that regular diffusion persists at long times with an enhanced diffusion constant.
PHYSICAL REVIEW LETTERS
(2022)
Correction
Physics, Multidisciplinary
Francisco Vargas, Pierre Thodoroff, Austen Lamacraft, Neil Lawrence
Article
Quantum Science & Technology
Pieter W. Claeys, Austen Lamacraft
Summary: This study investigates the emergence of a new kind of random matrix behavior in unitary dynamics following a quantum quench. It provides an alternative construction that can be extended to general chaotic dual-unitary circuits, highlighting the role of dual-unitarity and showing the exact solvability and random matrix behavior of these models. The study also demonstrates how complex Hadamard matrices and unitary error bases lead to solvable measurement schemes.
Article
Physics, Multidisciplinary
Pieter W. Claeys, Austen Lamacraft
Summary: In specific open systems with collective dissipation, the Liouvillian can be mapped to a non-Hermitian Hamiltonian. This study considers such a system and presents the exact Bethe ansatz solution. As the strength of the coupling to the environment increases, the system's spectrum in a fixed symmetry sector transitions from a broken pseudo-Hermitian phase with complex conjugate eigenvalues to a pseudo-Hermitian phase with real eigenvalues, passing through a series of exceptional points and associated dissipative quantum phase transitions.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Physics, Multidisciplinary
Pieter W. Claeys, Austen Lamacraft
PHYSICAL REVIEW RESEARCH
(2020)
Article
Materials Science, Multidisciplinary
Austen Lamacraft
