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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.
American Physical Society
Publication date: 
15 Jun 2010

Luca Barbiero, Marco Casadei, M Dalmonte, C Degli Esposti Boschi, E Ercolessi, F Ortolani

Biblio References: 
Volume: 81 Issue: 22 Pages: 224512
Physical Review B