  Based on first-principles calculations, we studied the geometric
configuration, stability and electronic structure of the two-dimensional Janus
MoTeB2. The MoTeB2 monolayer is semimetal, and its attractive electronic
structure reveals the perfect electron-hole compensation. Moreover, the
electron-type and hole-type bands of the MoTeB2 monolayer are easily adjustable
by external stain and charge doping, such as the switch of carrier polarity by
charge doping, and the metal-semiconductor transition under tensile stain.
These properties allow the MoTeB2 monolayer to be a controllable
two-dimensional material with extraordinary large magnetoresistance in magnetic
field.
