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

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Casadei,  Marco
Theory, Fritz Haber Institute, Max Planck Society;

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Citation

Barbiero, L., Casadei, M., Dalmonte, M., Boschi, C. D. E., Ercolessi, E., & Ortolani, F. (2010). Phase separation and pairing regimes in the one-dimensional asymmetric Hubbard model. Physical review / B, 81: 224512. doi:10.1103/PhysRevB.81.224512.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-29EE-7
Abstract
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