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arXiv quant-ph/0409114quant-ph
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二维Bloch振荡的Lie代数方法

Two-dimensional Bloch oscillations: A Lie-algebraic approach

S. Mossmann, A. Schulze, D. Witthaut, H. J. Korsch

摘要:

一个李代数方法成功地用于描述一维Bloch振荡的紧束缚近似扩展到二维。这种扩展具有相同的代数结构的一维情况下,而动力学表现出更丰富的行为。Bloch振荡的代数算子的期望值和宽度的解析表达式进行了讨论。它示出了在何种条件下的振荡生存在两个维度和质量的中心的波包示出了Lissajous样的运动。与一维情况相反,波包表现出依赖于场的方向和无场系统的色散关系的系统色散。

英文摘要:

A Lie-algebraic approach successfully used to describe one-dimensional Bloch oscillations in a tight-binding approximation is extended to two dimensions. This extension has the same algebraic structure as the one-dimensional case while the dynamics shows a much richer behaviour. The Bloch oscillations are discussed using analytical expressions for expectation values and widths of the operators of the algebra. It is shown under which conditions the oscillations survive in two dimensions and the centre of mass of a wave packet shows a Lissajous like motion. In contrast to the one-dimensional case, a wavepacket shows systematic dispersion that depends on the direction of the field and the dispersion relation of the field free system.

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