Phase separation and pairing regimes in the one-dimensional asymmetric Hubbard model

Journal Article · Tue Jun 01 00:00:00 EDT 2010 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.81.224512· OSTI ID:21386741

Barbiero, L ^[1]; Casadei, M ^[2]; Dalmonte, M; Ercolessi, E; Ortolani, F ^[3]; Degli Esposti Boschi, C ^[4]

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1. Dipartimento di Fisica del Politecnico, corso Duca degli Abruzzi, 24, 10129 Torino (Italy)
2. Fritz Haber Institute of the Max Planck Society, Abteilung Theorie, Faradayweg 4-6, 14195 Berlin (Germany)
3. Dipartimento di Fisica, Universita di Bologna, via Irnerio, 46, 40126 Bologna (Italy)
4. CNR, Unita CNISM di Bologna, viale Berti-Pichat, 6/2, 40127, Bologna (Italy)

We address some open questions regarding the phase diagram of the one-dimensional Hubbard model with asymmetric hopping coefficients and balanced species. In the attractive regime we present a numerical study of the passage from on-site pairing dominant correlations at small asymmetries to charge-density waves in the region with markedly different hopping coefficients. In the repulsive regime we exploit two analytical treatments in the strong- and weak-coupling regimes in order to locate the onset of phase separation at small and large asymmetries, respectively.

• OSTI ID: 21386741
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 81, Issue 22; Other Information: DOI: 10.1103/PhysRevB.81.224512; (c) 2010 The American Physical Society; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ASYMMETRY
CHARGE DENSITY
CORRELATIONS
COUPLING
HUBBARD MODEL
NUMERICAL ANALYSIS
ONE-DIMENSIONAL CALCULATIONS
PHASE DIAGRAMS
STRONG-COUPLING MODEL
WEAK-COUPLING MODEL
CRYSTAL MODELS
DIAGRAMS
INFORMATION
MATHEMATICAL MODELS
MATHEMATICS
NUCLEAR MODELS
PARTICLE MODELS