Spectroscopy of collective excitations in interacting low-dimensional many-body systems using quench dynamics.
Spectroscopy of collective excitations in interacting low-dimensional many-body systems using quench dynamics.
复制标题
使用淬灭动力学对相互作用的低维多体系统中的集体激发进行光谱分析。
DOI：
10.1103/physrevlett.99.200404
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发表时间：
2007
影响因子：
8.6
通讯作者：
A. Polkovnikov
中科院分区：
文献类型：
--
作者：
V. Gritsev;E. Demler;M. Lukin;A. Polkovnikov
研究了多体低维系统中相互作用参数的快速变化问题。结果表明，通过测量猝灭后的关联函数，可以得到系统集体激发谱的信息。这一观察是支持几个可积模型的分析，我们认为，这是有效的不可积模型以及。我们的结论进行精确的数值模拟有限系统的补充。我们建议，测量功率谱动态分裂成两个耦合的凝聚体的一维玻色-爱因斯坦凝聚体可以作为我们的预测的实验测试。
We study the problem of rapid change of the interaction parameter (quench) in a many-body low-dimensional system. It is shown that, measuring the correlation functions after the quench, the information about a spectrum of collective excitations in a system can be obtained. This observation is supported by analysis of several integrable models and we argue that it is valid for nonintegrable models as well. Our conclusions are supplemented by performing exact numerical simulations on finite systems. We propose that measuring the power spectrum in a dynamically split 1D Bose-Einsten condensate into two coupled condensates can be used as an experimental test of our predictions.