The T=0 phase diagram for two Hubbard chains with interchain hopping t and on-site repulsion U is derived within a renormalization-group (RG) approach. We explicitly allow for renormalization of the Fermi momenta. A nonzero t drives the chains towards strong coupling, and only for large t is a Luttinger liquid recovered. By use of weak-coupling RG, a qualitative picture of the phase diagram can be obtained. Our calculations show two different strong-coupling regimes: one with nonvanishing effective interchain hopping (t0), not confining, for small U, and another with t=0, confining, for large U. Numerical diagonalizations for a small cluster support the RG results

Strong-coupling phases of two Hubbard chains with interchain hopping / Fabrizio, Michele; Parola, A; Tosatti, E.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER. - ISSN 0163-1829. - 46:5(1992), pp. 3159-3162. [10.1103/PhysRevB.46.3159]

Strong-coupling phases of two Hubbard chains with interchain hopping

Fabrizio, Michele;
1992-01-01

Abstract

The T=0 phase diagram for two Hubbard chains with interchain hopping t and on-site repulsion U is derived within a renormalization-group (RG) approach. We explicitly allow for renormalization of the Fermi momenta. A nonzero t drives the chains towards strong coupling, and only for large t is a Luttinger liquid recovered. By use of weak-coupling RG, a qualitative picture of the phase diagram can be obtained. Our calculations show two different strong-coupling regimes: one with nonvanishing effective interchain hopping (t0), not confining, for small U, and another with t=0, confining, for large U. Numerical diagonalizations for a small cluster support the RG results
1992
46
5
3159
3162
https://journals.aps.org/prb/pdf/10.1103/PhysRevB.46.3159
Fabrizio, Michele; Parola, A; Tosatti, E.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/14359
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