Abstract

The structural phase transition, electronic structures, and optical properties of MoS2 are investigated at high pressure via first-principles calculations. Among the 12 structures of MoS2 including stable and metastable structures, the 2R1-MoS2 (described by space group P3m1) and the 3Hb-MoS2 (described by space group P63/mmc) are identified as the stable structures. The results of the electronic structures show that the 2R1-MoS2 transforms from semiconductor to metal and the metallicity of the 3Hb-MoS2 increases under pressure. The optical properties of MoS2 are significantly enhanced and red-shifted in the low-energy region with increasing pressure.

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