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Shengxi Huang, Xi Ling, Liangbo Liang, Jing Kong, Humberto Terrones, Vincent Meunier,  and Mildred S. Dresselhaus

DOI: 10.1021/nl5014597

Two-dimensional molybdenum disulfide (MoS2) is a promising material for optoelectronic devices due to its strong photoluminescence emission. In this work, the photoluminescence of twisted bilayer MoS2 is investigated, revealing a tunability of the interlayer coupling of bilayer MoS2. It is found that the photoluminescence intensity ratio of the trion and exciton reaches its maximum value for the twisted angle 0° or 60°, while for the twisted angle 30° or 90° the situation is the opposite. This is mainly attributed to the change of the trion binding energy. The first-principles density functional theory analysis further confirms the change of the interlayer coupling with the twisted angle, which interprets our experimental results.

Related Links:

Probing the Interlayer Coupling of Twisted Bilayer MoS2 Using Photoluminescence Spectroscopy (NanoLetters)

Toward optical chips (MIT News)

Professor Mildred Dresselhaus

MGM Group

Professor Jing Kong

Nano-Materials and Electronics Group