Our density functional theory calculations show that tiny-gap semiconductor SiGe monolayer is a quantum valley Hall insulator with a spontaneous electric polarization and, under a small biaxial strain ...
Exemplified by Molybdenum disulfide (MoS 2), two-dimensional transition metal dichalcogenides (2D-TMDCs) possess unique traits of atomic-scale thickness, flexibility and distinctive direct bandgap ...
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