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 language | English |
|---|---|
| Article number | 195425 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 84 |
| Issue number | 19 |
| DOIs | |
| Publication status | Published - 2011 Nov 7 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
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Low-velocity anisotropic Dirac fermions on the side surface of topological insulators. / Moon, Chang Youn; Han, Jinhee; Lee, Hyungjun; Choi, Hyoung Joon.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 84, No. 19, 195425, 07.11.2011.Research output: Contribution to journal › Article
TY - JOUR
T1 - Low-velocity anisotropic Dirac fermions on the side surface of topological insulators
AU - Moon, Chang Youn
AU - Han, Jinhee
AU - Lee, Hyungjun
AU - Choi, Hyoung Joon
PY - 2011/11/7
Y1 - 2011/11/7
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.84.195425
DO - 10.1103/PhysRevB.84.195425
M3 - Article
AN - SCOPUS:82655174071
VL - 84
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 19
M1 - 195425
ER -