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arXiv 1405.3589cond-mat.str-el
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二维无公度2k_F电荷或自旋密度波序开始时的非费米液体行为

Non-Fermi liquid behavior at the onset of incommensurate 2k_F charge or spin density wave order in two dimensions

Tobias Holder, Walter Metzner

摘要:

我们分析了量子临界涨落对二维金属中无公度$2k_F$电荷或自旋密度波序的单粒子激发的影响。在费米表面上的高对称位置处的单对热点的情况需要与两个热点对的情况区分开。我们在首阶微扰下计算了涨落传播子和电子自能。在热点处的单粒子衰变率的能量依赖性服从非费米液体幂律,在单个热点对的情况下指数为2/3,而在两个热点对的情况下指数为1。在后一种情况下得到的线性行为的前因子不是粒子-空穴对称的。

英文摘要:

We analyze the influence of quantum critical fluctuations on single-particle excitations at the onset of incommensurate $2k_F$ charge or spin density wave order in two-dimensional metals. The case of a single pair of hot spots at high symmetry positions on the Fermi surface needs to be distinguished from the case of two hot spot pairs. We compute the fluctuation propagator and the electronic self-energy perturbatively in leading order. The energy dependence of the single-particle decay rate at the hot spots obeys non-Fermi liquid power laws, with an exponent 2/3 in the case of a single hot spot pair, and exponent one for two hot spot pairs. The prefactors of the linear behavior obtained in the latter case are not particle-hole symmetric.

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