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arXiv 0801.4327cond-mat.str-el
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二维平坦费米面的Luttinger液体不动点

Luttinger liquid fixed point for a 2D flat Fermi surface

Vieri Mastropietro

摘要:

我们考虑了一个具有平坦费米面的二维相互作用费米子系统。Luttinger和非Luttinger液体行为之间的明显冲突,发现通过不同的近似解决了显示存在一条线的非平凡的不动点,RG流,对应于Luttinger液体行为;边缘相关的运营商的存在下,可能会导致流远离固定点。该分析是非微扰的,并基于实施,在每个RG迭代,沃德恒等式获得的局部相变依赖于费米面侧,这意味着部分消失的β函数。

英文摘要:

We consider a system of 2D interacting fermions with a flat Fermi surface. The apparent conflict between Luttinger and non Luttinger liquid behavior found through different approximations is resolved by showing the existence of a line of non trivial fixed points, for the RG flow, corresponding to Luttinger liquid behavior; the presence of marginally relevant operators can cause flow away from the fixed point. The analysis is non-perturbative and based on the implementation, at each RG iteration, of Ward Identities obtained from local phase transformations depending on the Fermi surface side, implying the partial vanishing of the Beta function.

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