Zhigang Wang, Zhen-Guo Fu, Ping Zhang
The effective mass and superfluidity-normal phase transition temperature of
magnetoexcitons in topological insulator bilayers are theoretically
investigated. The intra-Landau-level Coulomb interaction is treated
perturbatively, from which the effective magnetoexciton mass is analytically
discussed. The inclusion of inter-Landau-level Coulomb interaction by more
exact numerical diagonalization of the Hamiltonian brings out important
modifications to magnetoexciton properties, which are specially charaterized by
prominent reduction in the magnetoexciton effective mass and promotion in the
superfluidity-normal phase transition temperature at a wide range of external
parameters.
View original:
http://arxiv.org/abs/1202.0361
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