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arXiv 1002.0772math-phmath.MP
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多电子系统中关联函数的指数衰减

Exponential decay of correlation functions in many-electron systems

Yohei Kashima

摘要:

对于超立方晶格上的一类紧束缚多电子模型,证明了非零温度下的等时关联函数随电子位置中心到空穴位置中心的距离指数衰减.如果相互作用足够小,取决于温度,则衰变边界在热力学极限中的任何空间维度中保持。证明是基于U(1)-不变性和体积无关的扰动界的有限维格拉斯曼积分制定的关联函数。

英文摘要:

For a class of tight-binding many-electron models on hyper-cubic lattices the equal-time correlation functions at non-zero temperature are proved to decay exponentially in the distance between the center of positions of the electrons and the center of positions of the holes. The decay bounds hold in any space dimension in the thermodynamic limit if the interaction is sufficiently small depending on temperature. The proof is based on the U(1)-invariance property and volume-independent perturbative bounds of the finite dimensional Grassmann integrals formulating the correlation functions.

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