Tuning Dissipation and Excitations in Superfluid Fermi Gases with a Moving Impurity
arXiv:1902.04710 · doi:10.1103/PhysRevA.100.033611
Abstract
We develop a method to extract the dissipation for a heavy moving impurity immersed in superfluid Fermi gases. The drag force is derived analytically. As a reward, we are able to extract the dynamical structure factor, from which density excitations of the system is carefully examined. We show that dissipations through drag force is associated with two types of excitations, one being single-particle and the other being collective. We map out the critical velocity for dissipation across the BEC-BCS crossover, consistent with existing experiments. For a magnetic impurity, we show that the dissipation is immune to collective excitations. Our study clearly manifests that dissipation and associated excitations can be controlled by coupling superfluid Fermi gases with a moving impurity, and paves the way for further exploring intriguing realm of nonequilibrium phenomena and dissipation dynamics.
arXiv comment6 pages, 5 figures
References in corpus (52)
- Many-Body Physics with Ultracold Gases
- Feshbach Resonances in Ultracold Gases
- Artificial gauge potentials for neutral atoms
- Theory of ultracold Fermi gases
- Light-induced gauge fields for ultracold atoms
- Vortices and Superfluidity in a Strongly Interacting Fermi Gas
- Cold atoms in cavity-generated dynamical optical potentials
- Revealing the Superfluid Lambda Transition in the Universal Thermodynamics of a Unitary Fermi Gas
- Degenerate Quantum Gases with Spin-Orbit Coupling
- Exploring the Thermodynamics of a Universal Fermi Gas
- Superflow in a toroidal Bose-Einstein condensate: an atom circuit with a tunable weak link
- Evidence for a critical velocity in a Bose-Einstein condensed gas
- Observation of Attractive and Repulsive Polarons in a Bose-Einstein Condensate
- Universal Thermodynamics of Degenerate Quantum Gases in the Unitarity Limit
- Bose polarons in the strongly interacting regime
- Observation of vortex dipoles in an oblate Bose-Einstein condensate
- Ultrafast many-body interferometry of impurities coupled to a Fermi sea
- Motion of a heavy impurity through a Bose-Einstein condensate
- BCS-BEC Crossover and the Unitary Fermi Gas
- Repulsive Fermi polarons in a resonant mixture of ultracold Li atoms
- The BCS-BEC crossover: From ultra-cold Fermi gases to nuclear systems
- Suppression and enhancement of impurity scattering in a Bose-Einstein condensate
- Stationary and non-stationary fluid flow of a Bose-Einstein condensate through a penetrable barrier
- Time dependent impurity in ultracold fermions: orthogonality catastrophe and beyond
- Quantum Fluctuations in the Superfluid State of the BCS-BEC Crossover
- Superfluid behaviour of a two-dimensional Bose gas
- Collective mode of homogeneous superfluid Fermi gases in the BEC-BCS crossover
- Universal many-body response of heavy impurities coupled to a Fermi sea
- Creation of Rydberg Polarons in a Bose Gas
- Critical velocity for superfluid flow across the BEC-BCS crossover
- Bogoliubov-Cerenkov radiation in a Bose-Einstein condensate flowing against an obstacle
- From the Bogoliubov-de Gennes equations for superfluid fermions to the Gross-Pitaevskii equation for condensed bosons
- Vortices in Superfluid Fermi Gases through the BEC to BCS Crossover
- Goldstone mode and pair-breaking excitations in atomic Fermi superfluids
- Higgs mode in a strongly interacting fermionic superfluid
- The critical velocity in the BEC-BCS crossover
- Critical Velocity and Dissipation of an ultracold Bose-Fermi Counterflow
- Connecting dissipation and phase slips in a Josephson junction between fermionic superfluids
- Momentum transferred to a trapped Bose-Einstein condensate by stimulated light scattering
- Artificial gauge fields with ultracold atoms
- Critical Velocity of Superfluid Flow past Large Obstacles in Bose-Condensates
- Measurement of the Dynamical Structure Factor of a 1D Interacting Fermi Gas
- Single Impurity In Ultracold Fermi Superfluids
- Probing superfluidity of Bose-Einstein condensates via laser stirring
- Concavity of the collective excitation branch of a Fermi gas in the BEC-BCS crossover
- The Landau critical velocity for a particle in a Fermi superfluid
- Low-momentum dynamic structure factor of a strongly interacting Fermi gas at finite temperature: The Goldstone phonon and its Landau damping
- Beliaev damping of the Goldstone mode in atomic Fermi superfluids
- Drag force on a moving impurity in a spin-orbit coupled Bose-Einstein condensate
- Probing the dynamic structure factor of a neutral Fermi superfluid along the BCS-BEC crossover using atomic impurity qubits
- Effects of periodic potentials on the critical velocity of superfluid Fermi gases in the BCS-BEC crossover
- Motion of an Impurity in a Bose-Einstein Condensate with Weyl Spin-Orbit Coupling: Non-collinear Drag Force and Anisotropic Critical Velocity