TY - JOUR
T1 - Quantum Dynamics in Double-Well System with Polychromatic Perturbation Using Entangled Trajectory Molecular Dynamics Method
AU - Xu , Feng
AU - Zhang , Lei
AU - Zheng , Yujun
JO - Journal of Atomic and Molecular Sciences
VL - 4
SP - 163
EP - 171
PY - 2016
DA - 2016/07
SN - 7
DO - http://doi.org/10.4208/jams.050916.080216a
UR - https://global-sci.org/intro/article_detail/jams/8145.html
KW - Entangled trajectory molecular dynamics method, Coherent destruction of tunneling, Classical chaos.
AB - <p style="text-align: justify;">We investigate quantum dynamics in a double-well system subject to time-dependent
perturbation with some incommensurate frequencies using entangled trajectory
molecular dynamics method. We first compare time evolution of energy of the
driven system with two mode perturbation under classical dynamics with one under
quantum dynamics, it is found that quantum dynamics obeys Ehrenfest&#39;s theorem and
it shows our results obtain from entangled trajectory molecular dynamics method are
correct and accurate. Quantum coherence suppresses trajectory which initial energy
is higher than barrier to get over it, this process is named coherent destruction of tunneling
(CDT). We show this interesting phenomenon through showing entangled trajectory
and corresponding classical trajectory in phase space and discuss their energy
fluctuation with time. Furthermore, we discuss quantum dynamics with different frequency
mode perturbation from the perspective of autocorrelation evolution, classical
chaos brings remarkable influence on quantum-mechanical phenomena.</p>