Quantum Monte Carlo Study on Impurity Pinning in One-Dimensional Interacting Electron Systems-Competition between Charge Density and Superconducting Fluctuations-

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Effects of random impurities on one-dimensional interacting electron systems arestudied by use of the quantum Monte Carlo method and the phase variable represen-tation of charge density and superconducting fluctuations. The impurities pin thephase variable of charge density fluctuation, whereas the quantum fluctuation aroundthe pinned state reduces the pinning effect yielding increase of the superconductingfluctuation since the charge density and the superconducting fluctuations are corn-plementary to each other. Such interplay between randomness and interactions isshown explicitly by calculating spatial dependence of quantum fluctuations,metastable states and correlation functions for superconductivity. Quantumcharacter of metastable states is discussed. It is found that superconducting state ismore sensitive to impurities than charge density wave state when the interaction be-tween electrons is weak.
社団法人日本物理学会の論文
1986-09-15