Institution: | Department of Physics, China University of Mining and Technology, Xuzhou 221116, China;Department of Physics, China University of Mining and Technology, Xuzhou 221116, China;Department of Physics, China University of Mining and Technology, Xuzhou 221116, China;Department of Physics, China University of Mining and Technology, Xuzhou 221116, China;Department of Physics, China University of Mining and Technology, Xuzhou 221116, China |