Projected wave functions and high temperature superconductivity
Projected wave functions and high temperature superconductivity
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DOI：
10.1103/physrevlett.87.217002
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发表时间：
2001-11-19
影响因子：
8.6
通讯作者：
Trivedi, N
中科院分区：
文献类型：
--
作者：
Paramekanti, A;Randeria, M;Trivedi, N
我们用变分蒙特卡罗方法研究了具有与CuCuates有关的参数的Hubbard模型。对于掺杂0<；x0.35，我们得到一个超导体，它的序参数Phi(X)跟踪观测到的非单调T-c(X)。变分参数Delta(Var)(X)与光电子能谱中的(pi，0)“驼峰”和T*成比例。投影导致谱函数的不相干，并从其矩的奇异行为中得到与x相似的节点准粒子重量Z，尽管费米速度仍然有限为x->；0。钻井液重量、D-LOW和超流体密度与实验一致，D-LOW与Z相似。
We study the Hubbard model with parameters relevant to cuprates using variational Monte Carlo for projected d-wave states. For doping 0 < x 0.35 we obtain a superconductor whose order parameter Phi (x) tracks the observed nonmonotonic T-c(x). The variational parameter Delta (var)(x) scales with the (pi, 0) "hump" and T* seen in photoemission. Projection leads to incoherence in the spectral function and from the singular behavior of its moments we obtain the nodal quasiparticle weight Z similar to x though the Fermi velocity remains finite as x --> 0. The Drude weight D-low and superfluid density are consistent with experiment and D-low similar to Z.