Two-component fermi gas on internal-state-dependent optical lattices

We study the phase diagram of a one-dimensional, two-component (i.e., pseudo-"spin"-(1/2)) ultracold atomic Fermi gas. The two atom species can have different hopping or mass. A very rich phase diagram for equal densities of the species is found, containing Mott insulators and superfluids....

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Bibliographic Details
Published in:Physical review letters 2005-11, Vol.95 (22), p.226402.1-226401.4, Article 226402
Main Authors: CAZALILLA, M. A, HO, A. F, GIAMARCHI, T
Format: Article
Language:English
Subjects:
ATOMS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Condensed matter: electronic structure, electrical, magnetic, and optical properties
DENSITY
Electron states
Exact sciences and technology
FERMI GAS
MASS
ONE-DIMENSIONAL CALCULATIONS
PHASE DIAGRAMS
Physics
SPIN
STRUCTURE FACTORS
SUPERFLUIDITY
Theories and models of many electron systems
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Summary:We study the phase diagram of a one-dimensional, two-component (i.e., pseudo-"spin"-(1/2)) ultracold atomic Fermi gas. The two atom species can have different hopping or mass. A very rich phase diagram for equal densities of the species is found, containing Mott insulators and superfluids. We also discuss coupling such 1D systems and the experimental signatures of the phases. In particular, we compute the spin-structure factor at small momentum, which should reveal a spin gap.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.95.226402