Low-velocity anisotropic Dirac fermions on the side surface of topological insulators

Chang Youn Moon, Jinhee Han, Hyungjun Lee, Hyoung Joon Choi

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

We report anisotropic Dirac-cone surface bands on a side-surface geometry of the topological insulator Bi2Se3 revealed by first-principles density-functional calculations. We find that the electron velocity in the side-surface Dirac cone is anisotropically reduced from that in the (111)-surface Dirac cone, and the velocity is not in parallel with the wave vector k except for k in high-symmetry directions. The size of the electron spin depends on the direction of k due to anisotropic variation of the noncollinearity of the electron state. The anisotropy of electronic structures follows the corresponding anisotropy of the surface atomic structure. Low-energy effective Hamiltonian is proposed for side-surface Dirac fermions, and its implications are presented including refractive transport phenomena occurring at the edges of topological insulators where different surfaces meet.

Original languageEnglish
Article number195425
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number19
DOIs
Publication statusPublished - 2011 Nov 7

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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