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Monte Carlo study of thermal fluctuations and Fermi-arc formation in d-wave superconductors

机译:蒙特卡罗研究d波超导体中的热涨落和费米电弧形成

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摘要

From the perspective of thermal fluctuations, we investigate the pseudogap phenomena in underdoped high-temperature curpate superconductors. We present a local update Monte Carlo procedure based on the Green's function method to sample the fluctuating pairing field. The Chebyshev polynomial method is applied to calculate the single-particle spectral function directly and efficiently. The evolution of Fermi arcs as a function of temperature is studied by examining the spectral function at Fermi energy as well as the loss of spectral weight. Our results signify the importance of the vortexlike phase fluctuations on the formation of Fermi arcs.
机译:从热涨落的角度,我们研究了掺杂不足的高温cur酸盐超导体中的伪间隙现象。我们提出了一种基于格林函数方法的局部更新蒙特卡洛程序,以对波动的配对场进行采样。应用Chebyshev多项式方法直接有效地计算单粒子光谱函数。通过检查费米能量下的光谱函数以及光谱权重的损失,研究了费米电弧随温度的变化。我们的结果表明,涡旋状相位波动对费米弧的形成很重要。

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