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- W2134190588 abstract "We show that quantum diffusion has well-defined front shape. After an initial transient, the wave packet front (tails) is described by a stretched exponential P(x,t) = A(t)exp(-absolute value of [x/w](gamma)), with 1 < gamma < infinity, where w(t) is the spreading width which scales as w(t) approximately t(beta), with 0 < beta < or = 1. The two exponents satisfy the universal relation gamma = 1/(1-beta). We demonstrate these results through numerical work on one-dimensional quasiperiodic systems and the three-dimensional Anderson model of disorder. We provide an analytical derivation of these relations by using the memory function formalism of quantum dynamics. Furthermore, we present an application to experimental results for the quantum kicked rotor." @default.
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- W2134190588 date "2001-03-19" @default.
- W2134190588 modified "2023-10-18" @default.
- W2134190588 title "Shape of the Quantum Diffusion Front" @default.
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- W2134190588 doi "https://doi.org/10.1103/physrevlett.86.2485" @default.
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