Dissipationless flow in a Bose-Fermi mixture
- URL: http://arxiv.org/abs/2304.07663v1
- Date: Sun, 16 Apr 2023 00:58:05 GMT
- Title: Dissipationless flow in a Bose-Fermi mixture
- Authors: Zoe Z. Yan, Yiqi Ni, Alexander Chuang, Pavel E. Dolgirev, Kushal
Seetharam, Eugene Demler, Carsten Robens, Martin Zwierlein
- Abstract summary: We study the collective oscillations of a spin-polarized Fermi gas immersed in a Bose-Einstein condensate.
Our findings open the door towards understanding non-equilibrium dynamics of strongly interacting Bose-Fermi mixtures.
- Score: 50.591267188664666
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Interacting mixtures of bosons and fermions are ubiquitous in nature. They
form the backbone of the standard model of physics, provide a framework for
understanding quantum materials such as unconventional superconductors and
two-dimensional electronic systems, and are of technological importance in
$^3$He/$^4$He dilution refrigerators. Bose-Fermi mixtures are predicted to
exhibit an intricate phase diagram featuring coexisting liquids, supersolids,
composite fermions, coupled superfluids, and quantum phase transitions in
between. However, their coupled thermodynamics and collective behavior
challenge our understanding, in particular for strong boson-fermion
interactions. Clean realizations of fully controllable systems are scarce.
Ultracold atomic gases offer an ideal platform to experimentally investigate
Bose-Fermi mixtures, as the species concentration and interaction strengths can
be freely tuned. Here, we study the collective oscillations of a spin-polarized
Fermi gas immersed in a Bose-Einstein condensate (BEC) as a function of the
boson-fermion interaction strength and temperature. Remarkably, for strong
interspecies interactions the fermionic collective excitations evolve to
perfectly mimic the bosonic superfluid collective modes, and fermion flow
becomes dissipationless. With increasing number of thermal excitations in the
Bose gas, the fermions' dynamics exhibit a crossover from the collisionless to
the hydrodynamic regime, reminiscent of the emergence of hydrodynamics in
two-dimensional electron fluids. Our findings open the door towards
understanding non-equilibrium dynamics of strongly interacting Bose-Fermi
mixtures.
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