Coherent destruction of tunneling and dark Floquet state
Coherent destruction of tunneling and dark Floquet state
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隧道效应和暗 Floquet 态的相干破坏
DOI：
10.1088/1367-2630/16/1/013007
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发表时间：
2014-01-09
影响因子：
3.3
通讯作者：
Wu, Biao
中科院分区：
文献类型：
--
作者：
Luo, Xiaobing;Li, Liping;Wu, Biao
我们研究了一个三相干耦合态系统，其中一个态相对于另外两个态周期性地移动。我们发现这个系统具有一个暗Floquet态，在中间态具有零准能量和可忽略的布居。这种黑暗的Floquet态动态地表现为抑制态间隧穿，这种现象被称为隧穿相干破坏（CDT）。由于它的起源与在双态驱动系统中发现的CDT不同，我们称之为暗CDT。在周期性驱动的高频极限处，该Floquet状态降低到公知的暗状态。我们的研究结果可以推广到更多的状态系统，并在现有技术中易于实现的实验进行验证。
We study a system of three coherently coupled states, where one state is shifted periodically against the other two. We discover that this system possesses a dark Floquet state that has zero quasi-energy and negligible population at the intermediate state. This dark Floquet state manifests itself dynamically in terms of the suppression of inter-state tunneling, a phenomenon known as coherent destruction of tunneling (CDT). Owing to its different origin from the CDT found in a two-state-driven system, we call it dark CDT. At a high-frequency limit for the periodic driving, this Floquet state reduces to the well-known dark state. Our results can be generalized to systems with more states and be verified with easily implemented experiments within the current technologies.