Interference nature of quantum breather oscillation

Interference nature of quantum breather oscillation
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量子呼吸振荡的干涉性质

DOI:
10.1088/1751-8113/47/16/165102
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发表时间:
2014
期刊:
Journal of Physics A: Mathematical and Theoretical
影响因子:
--
通讯作者:
F. Großmann
F. Großmann
中科院分区:
--
文献类型:
--
作者:
C. Zagoya;L. S. Schulman;F. Großmann

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在一个耦合的非线性振子系统中,呼吸(或本地模式)的解决方案研究完全量子力学,以及由传播子和经典维格纳动力学的半经典初值表示。我们证明了初始呼吸态是几乎简并本征态的叠加。从这个简单的观察,它遵循呼吸必须衰减和复苏(即振荡与能量局域化的延长时间)。数值结果显示为两个自由度的系统。半经典实时结果在很大程度上再现了全量子结果,而基于类似轨迹集的经典维格纳动力学则没有,这一事实表明呼吸振荡可以被视为一种干涉现象。
In a system of coupled nonlinear oscillators, the breather (or local mode) solution is studied fully quantum mechanically, as well as by a semiclassical initial value representation of the propagator and classical Wigner dynamics. We show that the initial breather state is a superposition of almost degenerate eigenstates. From this simple observation it follows that the breather must decay and revive (ie, oscillate with energy localization for extended times). Numerical results are shown for a two degree of freedom system. The fact that the semiclassical real-time result reproduces the full quantum one to a large degree, whereas the classical Wigner dynamics based on a similar set of trajectories does not, indicates that the breather oscillation can be viewed as an interference phenomenon.
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