Interacting Fermi Gases in Disordered One-Dimensional Lattices

Details Interacting Fermi Gases in Disordered One-Dimensional Lattices Interacting Fermi Gases in Disordered One-Dimensional Lattices

2006-03-06

arxiv.org/abs/cond-mat/0603118v1

Phys. Rev. B 73, 161103(R) (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 4 figures, submitted

Scientific paper

10.1103/PhysRevB.73.161103

Interacting two-component Fermi gases loaded in a one-dimensional (1D) lattice and subject to harmonic trapping exhibit intriguing compound phases in which fluid regions coexist with local Mott-insulator and/or band-insulator regions. Motivated by experiments on cold atoms inside disordered optical lattices, we present a theoretical study of the effects of a random potential on these ground-state phases. Within a density-functional scheme we show that disorder has two main effects: (i) it destroys the local insulating regions if it is sufficiently strong compared with the on-site atom-atom repulsion, and (ii) it induces an anomaly in the compressibility at low density from quenching of percolation.

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