N-chain Hubbard model in weak coupling
N-chain Hubbard model in weak coupling
复制标题
弱耦合的 N 链 Hubbard 模型
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
M. Fisher
中科院分区：
文献类型：
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作者：
Hsiu;L. Balents;M. Fisher
我们提出了一个系统的弱耦合重整化群~RG！技术研究的N耦合一维相互作用的电子系统的集合，重点是N腿哈伯德梯子的例子。对于N52，3，我们恢复了以前的结果，并发现这些模型的相空间的更广泛的区域是不稳定的配对，通常近似d波对称。我们展示了如何这些不稳定性可以理解的一个相当传统的“间隙”功能D在离散费米表面，并描述如何计算这个功能。空间转换为N！并且许多这样的梯子弱耦合在一起。@S0163-1829~97！00836-9#
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 N52,3, 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 D at the discretized Fermi surface, and describe how this function is calculated. The dimensional crossovers as N!‘ and as many such ladders are weakly coupled together are also discussed. @S0163-1829~97!00836-9#