TY - JOUR
T1 - Strongly Interacting Bose-Fermi Mixtures
T2 - Mediated Interaction, Phase Diagram, and Sound Propagation
AU - Shen, Xin
AU - Davidson, Nir
AU - Bruun, Georg M.
AU - Sun, Mingyuan
AU - Wu, Zhigang
N1 - Publisher Copyright: © 2024 American Physical Society.
PY - 2024/1/19
Y1 - 2024/1/19
N2 - Motivated by recent surprising experimental findings, we develop a strong-coupling theory for Bose-Fermi mixtures capable of treating resonant interspecies interactions while satisfying the compressibility sum rule. We show that the mixture can be stable at large interaction strengths close to resonance, in agreement with the experiment, but at odds with the widely used perturbation theory. We also calculate the sound velocity of the Bose gas in the Cs133-Li6 mixture, again finding good agreement with the experimental observations both at weak and strong interactions. A central ingredient of our theory is the generalization of a fermion mediated interaction to strong Bose-Fermi scatterings and to finite frequencies. This further leads to a predicted hybridization of the sound modes of the Bose and Fermi gases, which can be directly observed using Bragg spectroscopy.
AB - Motivated by recent surprising experimental findings, we develop a strong-coupling theory for Bose-Fermi mixtures capable of treating resonant interspecies interactions while satisfying the compressibility sum rule. We show that the mixture can be stable at large interaction strengths close to resonance, in agreement with the experiment, but at odds with the widely used perturbation theory. We also calculate the sound velocity of the Bose gas in the Cs133-Li6 mixture, again finding good agreement with the experimental observations both at weak and strong interactions. A central ingredient of our theory is the generalization of a fermion mediated interaction to strong Bose-Fermi scatterings and to finite frequencies. This further leads to a predicted hybridization of the sound modes of the Bose and Fermi gases, which can be directly observed using Bragg spectroscopy.
UR - http://www.scopus.com/inward/record.url?scp=85182727937&partnerID=8YFLogxK
U2 - https://doi.org/10.1103/PhysRevLett.132.033401
DO - https://doi.org/10.1103/PhysRevLett.132.033401
M3 - مقالة
SN - 0031-9007
VL - 132
JO - Physical review letters
JF - Physical review letters
IS - 3
M1 - 033401
ER -