Vibrational spectrum renormalization by enforced coupling across the van der Waals gap between MoS2 and WS2 monolayers

摘要: Wen Fan,1 Xi Zhu,2 Feng Ke,3 Yabin Chen,1 Kaichen Dong,1 Jie Ji,4 Bin Chen,3 Sefaattin Tongay,5 Joel W. Ager,6 Kai Liu,7 Haibin Su,2,* and Junqiao Wu1,6,† 1Department of Materials Science Engineering, University California, Berkeley, California 94720, USA 2School Nanyang Technological University, Singapore 639798, 3Center for High Pressure Technology Advanced Research, Shanghai 201203,China 4Department Thermal Energy China, Hefei, Anhui 230027, China 5School Engineering Matter, Transport Energy, Arizona State Tempe, 85287, 6Materials Sciences Division, Lawrence Berkeley National Laboratory, 7School Tsinghua Beijing 100084, (Received 22 July 2015; revised manuscript received 26 October published 18 December 2015)