Strong nonlinear terahertz response induced by Dirac surface states in Bi2Se3 topological insulator.

ABSTRACT: Electrons with a linear energy/momentum dispersion are called massless Dirac electrons and represent the low-energy excitations in exotic materials such as graphene and topological insulators. Dirac electrons are characterized by notable properties such as a high mobility, a tunable density and, in topological insulators, a protection against backscattering through the spin-momentum locking mechanism. All those properties make graphene and topological insulators appealing for plasmonics applications. However, Dirac electrons are expected to present also a strong nonlinear optical behaviour. This should mirror in phenomena such as electromagnetic-induced transparency and harmonic generation. Here we demonstrate that in Bi2Se3 topological insulator, an electromagnetic-induced transparency is

SUBMITTER: Giorgianni F 

PROVIDER: S-EPMC4853424 | biostudies-literature | 2016 Apr

REPOSITORIES: biostudies-literature