Quantum tunneling dynamics in symmetrical driven double well system based on Husimi representation

Quantum tunneling dynamics in symmetrical driven double well system based on Husimi representation
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基于Husimi表示的对称驱动双井系统量子隧道动力学

DOI:
10.1016/j.physa.2018.05.068
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发表时间:
2018-10
期刊:
Physica A
影响因子:
--
通讯作者:
Yujun Zheng
Yujun Zheng
中科院分区:
其他
文献类型:
--
作者:
Feng Xu;Liangjun Zhai;Yujun Zheng

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本文采用基于胡思米表示的纠缠轨迹分子动力学方法,研究了对称驱动双阱系统中的量子隧穿过程。量子隧穿动力学表现出三种不同的物理机制:静止隧穿、混沌辅助隧穿和振荡隧穿。不同于其他方法,量子强调动力学过程是通过显示相空间中的纠缠轨迹来探索的。我们展示了纠缠轨迹在相空间中的混沌行为,并通过将纠缠轨迹与具有相同初始状态的经典轨迹进行比较,生动地展示了量子隧穿过程。进一步讨论了对称性破缺对势对量子动力学过程的影响,破缺势的对称性将显著降低量子隧穿概率。最后,讨论了强作用力对量子波包隧穿的抑制作用。
In present study, the quantum tunneling process in symmetrical driven double-well system is studied by using the entangled trajectory molecular dynamics method based on the Husimi representation. Quantum tunneling dynamics show three different physical mechanisms vary with the amplitude and frequency of driven force: reposeful tunneling, chaos-assisted tunneling, oscillatory tunneling. Different form other methods, quantum underline dynamics process are explored by showing entangled trajectory in the phase space. We show chaotic behavior of entangled trajectories in the phase space, and the quantum tunneling process is vividly shown by comparing entangled trajectory with the classical trajectory with the same initial state. Furthermore, we discuss the effect of symmetry breaking on the potential to the quantum dynamical process, quantum tunneling probability will be remarkably reduced by breaking potential’s symmetry. Finally, the suppression of quantum wave packet tunneling under strong force is presented.
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