Superconductivity and topological numbers in the Hubbard chain with bond-charge interaction

Journal Article · Wed Dec 01 00:00:00 EST 1999 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1023/A:1022556909284· OSTI ID:20015381

Aligia, A A; Hallberg, K; Batista, C D; Ortiz, G

The authors determine the quantum phase diagram of the Hubbard chain with electron-hole symmetric correlated hopping at 1/2- and 1/4-filling using geometric concepts and continuum limit field theory. The long distance behavior of various correlation functions show a very rich phase diagram with several insulating, metallic, and superconducting phases, which might be relevant to (TMTSF){sub 2}X compounds. The closing of charge and spin gaps are accurately resolved as topological transitions (jumps in {pi} of Berry phases). The metallic or insulating character of each thermodynamic phase is obtained from the ground-state expectation value of a displacement operator in reciprocal space.

• Research Organization: Comision Nacional de Energia Atomica, Bariloche (AR)
• OSTI ID: 20015381
• Journal Information: Journal of Low Temperature Physics, Vol. 117, Issue 5-6; Conference: International Conference on Physics and Chemistry of Molecular and Oxide Superconductors, Stockholm (SE), 07/28/1999--08/02/1999; Other Information: PBD: Dec 1999; ISSN 0022-2291
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ELECTRON-HOLE COUPLING
SUPERCONDUCTIVITY
HUBBARD MODEL
PHASE DIAGRAMS
TMTSF