Institute;
of;
Atomic;
and;
Molecular;
Physics,;
Sichuan;
University,;
Chengdu;
610065,;
China;
School;
of;
Physics;
and;
Electronic;
Engineering,;
Leshan;
Teachers;
College,;
Leshan;
614004,;
China;
School;
of;
Physical;
Science;
and;
Technology,;
Sichuan;
University,;
Chengdu;
610065,;
China;