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Crossover of the three-dimensional topological insulator Bi 2 Se 3 to the two-dimensional limit
The gapless surface states of topological insulators could enable quantitatively different types of electronic device. A study of the topological insulating Bi2Se3 thin films finds that a gap in…
Topological Insulators: Dirac Equation in Condensed Matters
- S. Shen
- 11 January 2013
From the Contents: Introduction.- Starting from the Dirac equation.- Minimal lattice model for topological insulator.- Topological invariants.- Topological phases in one dimension.- Quantum spin Hall…
Signatures of the Adler–Bell–Jackiw chiral anomaly in a Weyl fermion semimetal
Signs of the Weyl fermion chiral anomaly in the magneto-transport of TaAs are reported and it is observed that high mobility TaAs samples become more conductive as a magnetic field is applied along the direction of the current for certain ranges of the field strength.
Massive Dirac fermions and spin physics in an ultrathin film of topological insulator
We study transport and optical properties of the surface states which lie in the bulk energy gap of a thin-film topological insulator. When the film thickness is comparable with the surface state…
Finite size effects on helical edge states in a quantum spin-Hall system.
Through analytical solutions in a model calculation for a strip of finite width, it is found that edge states on the two sides can couple together to produce a gap in the spectrum, destroying the quantum spin-Hall effect.
Negative magnetoresistance in Dirac semimetal Cd3As2
The observation of NMR in Cd3As2 microribbons in parallel magnetic fields up to 66% at 50 K and visible at room temperatures is reported, demonstrating the chiral anomaly, a long-sought high-energy-physics effect, in solid-state systems.
Impurity effect on weak antilocalization in the topological insulator Bi2Te3.
The data demonstrate that the observed WAL is robust against deposition of nonmagnetic Au impurities on the surface of the thin films, but it is quenched by the deposition of magnetic Fe impurities which destroy the π Berry phase of the topological surface states.
Topological Anderson insulator.
The role of disorder is investigated in the context of the recently discovered topological insulator, which possesses a pair of helical edge states with opposing spins moving in opposite directions and exhibits the phenomenon of quantum spin Hall effect.
Effective continuous model for surface states and thin films of three-dimensional topological insulators
Two-dimensional (2D) effective continuous models are derived for the surface states and thin films of a three-dimensional topological insulator (3DTI). Starting from an effective model for 3DTI based…
TOPOLOGICAL INSULATOR AND THE DIRAC EQUATION
We present a general description of topological insulators from the point of view of Dirac equations. The Z2 index for the Dirac equation is always zero, and thus the Dirac equation is topologically…