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Normal state of a polarized Fermi gas at unitarity

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arxiv cond-mat/0607730 v1 pith:3TD3QMDW submitted 2006-07-27 cond-mat.other

C. Lobo , A. Recati , S. Giorgini , S. Stringari This is my paper · ORCID
classification cond-mat.other
keywords normaldownfermiatomscalculateminorityphasepredict
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We study the Fermi gas at unitarity and at T=0 by assuming that, at high polarizations, it is a normal Fermi liquid composed of weakly interacting quasiparticles associated with the minority spin atoms. With a quantum Monte Carlo approach we calculate their effective mass and binding energy, as well as the full equation of state of the normal phase as a function of the concentration x=n_\down/n_\up of minority atoms. We predict a first order phase transition from normal to superfluid at x_c=0.44 corresponding, in the presence of harmonic trapping, to a critical polarization P_c=(N_\up-N_\down)/ (N_\up+N_\down)=77%. We calculate the radii and the density profiles in the trap and predict that the frequency of the spin dipole mode will be increased by a factor of 1.23 due to interactions.

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  1. Rabi Oscillations of Strongly Driven Bose Polarons

    cond-mat.quant-gas 2025-04 conditional novelty 6.0 of 10

    A trial-wavefunction calculation predicts anomalous Rabi oscillations and a steady-state magnetization for strongly driven Bose polarons when attractive and repulsive polaron branches coexist.

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