Study on electronic structure and optical properties of monolayer hexagonal boron phosphide quantum dots
The electronic structure and optical properties of monolayer hexagonal boron phosphide quantum dots with zigzag shape are studied by using tight binding method under planar electric and vertical magnetic fields.The results show that the energy gap of monolayer hexagonal boron phosphide quantum dots,as direct bandgap semiconductors,does not change with the size in the absence of electric or magnetic field.Under the control of the plane electric field,the energy gap gradually decreases with the increase of the electric field until it disap-pears.The direction of the plane electric field almost has no effect on the monolayer hexagonal boron phosphide quantum dots,and the strength of electric field required for the disappearance of the energy gap gradually decrea-ses with the increase of the quantum dot size.Under the control of vertical magnetic field,the energy levels forms the Landau levels,while the Landau level at the edge of the energy gap is approximately a flat band,which does not change with the change of magnetic flux,and the density of states is mainly distributed at this Landau level.In addition,light absorption under vertical magnetic field is mainly caused by the transition between Landau levels.
Monolayer hexagonal boron phosphideQuantum dotsTight binding methodElectronic structure and optical propertiesElectric and magnetic fields
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