Temperature effect of the bound magnetopolaron on the bandgap in monolayer graphene.

Abstract Temperature effect of the bound magnetopolaron on the bandgap are discussed in monolayer graphene (MG). The Lee-Low-Pine unitary variational method and linear-combination operator are used to derive the average number of acoustic phonons of ground state and the energy gap of MG. We used quantum statistical theory to study the temperature effect of the bound magnetopolaron on the bandgap in MG. The relationships of the mean number of the acoustic phonons versus the temperature, cut-off wave number (CW), the magnetic field strength are simulated, and the energy gap (EG) of the bound magnetopolaron has a linear relationship with the temperature, the CW, the magnetic field strength, and the Coulomb bound parameter. Highlights • Temperature effect of mean phonon number in monolayer graphene (MG) is studied. • The energy gap (EG) of MG depends on the magnetic field and temperature. • The EG can be tunable by controlling of Coulomb bound potential. • The MG become a topological insulator under the magnetic field and temperature. • Temperature effect supplies theory for self-heating effect of the devices. [ABSTRACT FROM AUTHOR]