Energy spectrum of Dirac electrons on the surface of a topological insulator modulated by a spiral magnetization superlattice

Journal Article · Sun May 15 00:00:00 EDT 2011 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.83.195402· OSTI ID:21544769

Feng, Zhai; Peiyan, Mu; Kai, Chang ^[1]

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1. Center for Statistical and Theoretical Condensed Matter Physics and Department of Physics, Zhejiang Normal University, Jinhua 321004 (China)

We investigate the effect of a spiral magnetization superlattice on the surface electronic states of a three-dimensional topological insulator. It is shown that the energy spectrum of this superlattice system has only two Dirac points but many semi-Dirac points. The effective Hamiltonian near those points is expressed in terms of the spiral wave vector and the modulation amplitude. Near semi-Dirac points the band is linear along the spiral direction and quadratic along the transverse direction. There are two types of semi-Dirac points, which are distinguished by the number of parabolic bands passing them.

• OSTI ID: 21544769
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 83, Issue 19; Other Information: DOI: 10.1103/PhysRevB.83.195402; (c) 2011 American Institute of Physics; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMPLITUDES
ELECTRONS
ENERGY SPECTRA
HAMILTONIANS
MAGNETIZATION
SPIRAL CONFIGURATION
SUPERLATTICES
SURFACES
THREE-DIMENSIONAL CALCULATIONS
TOPOLOGY
CONFIGURATION
ELEMENTARY PARTICLES
FERMIONS
LEPTONS
MATHEMATICAL OPERATORS
MATHEMATICS
QUANTUM OPERATORS
SPECTRA