Renormalization group approach to spinor Bose-Fermi mixtures in a shallow optical lattice

Modak, S. ; Tsai, S-W. ; Sengupta, K. (2011) Renormalization group approach to spinor Bose-Fermi mixtures in a shallow optical lattice Physical Review B: Condensed Matter and Materials Physics, 84 (13). 134508_1-134508_8. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v84/i13/e134508

Related URL: http://dx.doi.org/10.1103/PhysRevB.84.134508

Abstract

We study a mixture of ultracold spin-half fermionic and spin-one bosonic atoms in a shallow optical lattice where the bosons are coupled to the fermions via both density-density and spin-spin interactions. We consider the parameter regime where the bosons are in a superfluid ground state, integrate them out, and obtain an effective action for the fermions. We carry out a renormalization group analysis of this effective fermionic action at low temperatures, show that the presence of the spinor bosons may lead to a separation of Fermi surfaces of the spin-up and spin-down fermions, and investigate the parameter range where this phenomenon occurs. We also calculate the susceptibilities corresponding to the possible superfluid instabilities of the fermions and obtain their possible broken-symmetry ground states at low temperatures and weak interactions.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:94373
Deposited On:15 Nov 2012 05:10
Last Modified:15 Nov 2012 05:10

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