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arXiv 1003.1783cond-mat.supr-concond-mat.str-el
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欠掺杂铜氧化物中费米弧现象的起源:KT型超导转变的特征

On the origin of the Fermi arc phenomena in the underdoped cuprates: signature of KT-type superconducting transition

Tao Li, Qiang Han

摘要:

用蒙特卡罗模拟研究了d波超导体中热相位涨落对电子谱函数$A(k,ω)$的影响。相位自由度由具有内置d波特征的XY型模型来建模。我们发现在高于XY模型的KT转变温度时,$A(k,ω=0)$的费米面上突然出现了脊状结构。这种脊状结构与欠掺杂铜氧化物赝能隙相的费米弧具有相同的特征,是由XY模型的涡旋状相位涨落引起的.

英文摘要:

We study the effect of thermal phase fluctuation on the electron spectral function $A(k,ω)$ in a d-wave superconductor with Monte Carlo simulation. The phase degree of freedom is modeled by a XY-type model with build-in d-wave character. We find a ridge-like structure emerges abruptly on the underlying Fermi surface in $A(k,ω=0)$ above the KT-transition temperature of the XY model. Such a ridge-like structure, which shares the same characters with the Fermi arc observed in the pseudogap phase of the underdoped cuprates, is found to be caused by the vortex-like phase fluctuation of the XY model.

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