Dissipationless flow in a Bose-Fermi mixture

• DOI: 10.48550/arxiv.2304.07663
• Publication Date: 2023-01-01
• Authors: Zoe Z. Yan; Yiqi Ni; Alexander Chuang; Pavel E. Dolgirev; Kushal Seetharam; Eugene Demler; Carsten Robens; Martin W. Zwierlein
• Keywords: Condensed Matter - Strongly Correlated Electrons; Quantum Physics; Strongly Correlated Electrons (cond-mat.str-el); Quantum Gases (cond-mat.quant-gas); Atomic Physics (physics.atom-ph); 500; FOS: Physical sciences; Quantum simulation; Ultracold gases; Condensed Matter - Quantum Gases; Quantum Physics (quant-ph); 7. Clean energy; 530; Physics - Atomic Physics

Interacting mixtures of bosons and fermions are ubiquitous in nature. They form the backbone standard model physics, provide a framework for understanding quantum materials such as unconventional superconductors two-dimensional electronic systems, technological importance $^3$He/$^4$He dilution refrigerators. Bose-Fermi predicted to exhibit an intricate phase diagram featuring coexisting liquids, supersolids, composite fermions, coupled superfluids, transitions between. However, their thermodynamics collective behavior challenge our understanding, particular strong boson-fermion interactions. Clean realizations fully controllable systems scarce. Ultracold atomic gases offer ideal platform experimentally investigate mixtures, species concentration interaction strengths can be freely tuned. Here, we study oscillations spin-polarized Fermi gas immersed Bose-Einstein condensate (BEC) function strength temperature. Remarkably, interspecies interactions fermionic excitations evolve perfectly mimic bosonic superfluid modes, fermion flow becomes dissipationless. With increasing number thermal Bose gas, fermions' dynamics crossover from collisionless hydrodynamic regime, reminiscent emergence hydrodynamics electron fluids. Our findings open door towards non-equilibrium strongly interacting mixtures.