Merging of Dirac points in a two-dimensional crystal
作者： G. Montambaux , F. Piéchon , J.-N. Fuchs , M. O. Goerbig
DOI: 10.1103/PHYSREVB.80.153412
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摘要: We study under which general conditions a pair of Dirac points in the electronic spectrum twodimensional crystal may merge into single one. The merging signals topological transition between semimetallic phase and band insulator. derive universal Hamiltonian that describes physical properties transition, is controlled by parameter, analyze Landau-level its
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