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Intermediate gapless phase and topological phase transition of the Kitaev model in a uniform magnetic field
We study the Kitaev model in a [001] magnetic field employing the mean-field theory in the Majorana fermion representation. The mean-field Hamiltonian of the system has the Bogoliubov--de Gennes (BdG) form of a two-dimensional superconductor. We discover a robust gapless regime in the intermediate magnetic field for both gapless and …