Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2011-01-11
Phys. Rev. Lett. 107, 196803 (2011)
Physics
Condensed Matter
Disordered Systems and Neural Networks
16 pages, 14 figures; replaced with the version accepted by PRL
Scientific paper
10.1103/PhysRevLett.107.196803
Four-component massive and massless Dirac fermions in the presence of long range Coulomb interaction and chemical potential disorder exhibit striking fermionic quantum criticality. For an odd number of flavors of Dirac fermions, the sign of the Dirac mass distinguishes the topological and the trivial band insulator phases, and the gapless semi-metallic phase corresponds to the quantum critical point that separates the two. Up to a critical strength of disorder, the semi-metallic phase remains stable, and the universality class of the direct phase transition between two insulating phases is unchanged. Beyond the critical strength of disorder the semi-metallic phase undergoes a phase transition into a disorder controlled diffusive metallic phase, and there is no longer a direct phase transition between the two types of insulating phases. Our results are also applicable to even number of flavors of Dirac fermions, and the band inversion transition in various non-topological narrow gap semiconductors.
Chakravarty Sudip
Goswami Pallab
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