Diffusion in the Mean for a Periodic Schrödinger Equation Perturbed by a Fluctuating Potential
Diffusion in the Mean for a Periodic Schrödinger Equation Perturbed by a Fluctuating Potential
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受波动势扰动的周期性薛定谔方程的均值扩散
DOI:
10.1007/s00220-020-03692-6
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发表时间:
2020
影响因子:
2.4
通讯作者:
Zhang, Shiwen
中科院分区:
文献类型:
--
作者:
Schenker, Jeffrey;Tilocco, F. Zak;Zhang, Shiwen
We consider the evolution of a quantum particle hopping on a cubic lattice in any dimension and subject to a potential consisting of a periodic part and a random part that fluctuates stochastically in time. If the random potential evolves according to a stationary Markov process, we obtain diffusive scaling for moments of the position displacement, with a diffusion constant that grows as the inverse square of the disorder strength at weak coupling. More generally, we show that a central limit theorem holds such that the square amplitude of the wave packet converges, after diffusive rescaling, to a solution of a heat equation.
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DOI:
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发表时间:
1985
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