Pseudogap and Fermi-arc evolution in the phase-fluctuation scenario
Pseudogap and Fermi-arc evolution in the phase-fluctuation scenario
复制标题
相位涨落场景中的赝能隙和费米弧演化
DOI：
10.1103/physrevb.82.052503
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发表时间：
2010-08-27
影响因子：
3.7
通讯作者：
Wang, Z. D.
中科院分区：
文献类型：
--
作者：
Han, Qiang;Li, Tao;Wang, Z. D.
香港薄扶林道香港大学物理学系及理论与计算物理中心（日期：2010年6月1日）采用XY模型模拟了低掺杂铜氧化物中的赝能隙现象和费米弧的形成。最重要的是，每个Monte Carlo样本的谱函数都是直接有效地由Chebyshev多项式计算的，而不必对角化费米子哈密顿量，这使我们能够处理足够大的系统以获得足够的动量/能量分辨率。我们发现，在远低于KT转变温度（T）的情况下，能隙的动量依赖性与纯d波超导体的能隙的动量依赖性相同
Department of Physics and Center of Theoretical and Computational Physics,The University of Hong Kong, Pokfulam Road, Hong Kong, China(Dated: June 1, 2010)Pseudogap phenomena and the formation of Fermi arcs in underdoped cuprates are numericallystudied in the presence of phase fluctuations that are simulated by an XY model. Most importantlythe spectral function for each Monte Carlo sample is calculated directly and efficiently by theChebyshev polynomials without having to diagonalize the fermion Hamiltonian, which enables us tohandle a system large enough to achieve sufficient momentum/energy resolution. We find that themomentum dependence of the energy gap is identical to that of a pure d-wave superconductor wellbelow the KT-transition temperature (T