end of the preparation of the present work, we noted a recent paper by Mao et al.  [@mao] for the same model. We should say that the approach used there is the adiabatic approximation of the present work, i.e., the zeroth-order approximation.

Acknowledgements
================

This work was supported by National Natural Science Foundation of China (Grants No.11547305, and No.11474256), Chongqing Research Program of Basic Research and Frontier Technology (Grant No.cstc2015jcyjA00043), and Research Fund for the Central Universities (Grant No.106112016CDJXY300005).

$^{*}$ Email:yuyuzh@cqu.edu.cn

$^{\dagger}$ Email:qhchen@zju.edu.cn

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