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Article Dans Une Revue The European Physical Journal B: Condensed Matter and Complex Systems Année : 2001

Competition of disorder and interchain hopping in a two-chain Hubbard model

Résumé

We study the interplay of Anderson localization and interaction in a two chain Hubbard ladder allowing for arbitrary ratio of disorder strength to interchain coupling. We obtain three different types of spin gapped localized phases depending on the strength of disorder: a pinned $4k_F$ Charge Density Wave (CDW) for weak disorder, a pinned $2k_F$ CDW$^\\pi$ for intermediate disorder and two independently pinned single chain $2k_F$ CDW for strong disorder. Confinement of electrons can be obtained as a result of strong disorder or strong attraction. We give the full phase diagram as a function of disorder, interaction strength and interchain hopping. We also study the influence of interchain hopping on localization length and show that localization is enhanced by a small interchain hopping but suppressed by a large interchain hopping.

Dates et versions

hal-00007693 , version 1 (26-07-2005)

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Yoshikazu Suzumura, Edmond Orignac. Competition of disorder and interchain hopping in a two-chain Hubbard model. The European Physical Journal B: Condensed Matter and Complex Systems, 2001, 23, pp.57. ⟨hal-00007693⟩
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