N-chain Hubbard model in weak coupling | |
Article | |
关键词: VALENCE-BOND STATE; T-J LADDERS; RENORMALIZATION-GROUP; PHASE-DIAGRAM; LUTTINGER LIQUIDS; HEISENBERG-CHAINS; 2-LEG LADDERS; SPIN GAP; SUPERCONDUCTIVITY; FERMIONS; | |
DOI : 10.1103/PhysRevB.56.6569 | |
来源: SCIE |
【 摘 要 】
We present a systematic weak-coupling renormalization group (RG) technique for studying a collection of N coupled one-dimensional interacting electron systems, focusing on the example of N-leg Hubbard ladders. For N=2,3, we recover previous results, and find that also more generally broad regions of the phase space of these models are unstable to pairing, usually with approximate d-wave symmetry. We show how these instabilities can be understood in terms of a fairly conventional ''gap'' function Delta at the discretized Fermi surface, and describe how this function is calculated. The dimensional crossovers as N-->infinity and as many such ladders are weakly coupled together are also discussed.
【 授权许可】
Free