Mott Criticality and Pseudogap in Bose-Fermi Mixtures - Kölner UniversitätsPublikationsServer

Altman, Ehud, Demler, Eugene and Rosch, Achim ORCID: 0000-0002-6586-5721 (2012). Mott Criticality and Pseudogap in Bose-Fermi Mixtures. Phys. Rev. Lett., 109 (23). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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DOI:10.1103/PhysRevLett.109.235304

Abstract

We study the Mott transition of a mixed Bose-Fermi system of ultracold atoms in an optical lattice, where the number of (spinless) fermions and bosons adds up to one atom per lattice, n(F) + n(B) = 1. For weak interactions, a Fermi surface coexists with a Bose-Einstein condensate while for strong interaction the system is incompressible but still characterized by a Fermi surface of composite fermions. At the critical point, the spectral function of the fermions A(k, omega) exhibits a pseudogapped behavior, rising as vertical bar omega vertical bar at the Fermi momentum, while in the Mott phase it is fully gapped. Taking into account the interaction between the critical modes leads at very low temperatures either to p-wave pairing or the transition is driven weakly first order. The same mechanism should also be important in antiferromagnetic metals with a small Fermi surface. DOI: 10.1103/PhysRevLett.109.235304

Item Type:

Journal Article

Creators:

Creators	Email	ORCID	ORCID Put Code
Altman, Ehud	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Demler, Eugene	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Rosch, Achim	UNSPECIFIED	orcid.org/0000-0002-6586-5721	UNSPECIFIED