1. State Key Laboratory of Physical Chemistry of Solid Surfaces; Collaborative Innovation Center of Chemistry for Energy Materials (iChEM); the MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, and Department of Chemistry; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
2. Department of Physics; Xiamen University; Xiamen 361005 China
3. School of Aerospace Engineering; Xiamen University; Xiamen 361005 China
4. Department of Electronic Science; Xiamen University; Xiamen 361005 China
5. Institute of Physics and Center of Interface Science; Carl von Ossietzky University; Oldenburg 26129 Germany