Ultrafast Control of Electron Dynamics in 3D Topological Insulator

S. Azar Oliaei Motlagh*, Jhih-Sheng Wu, Vadym Apalkov, Mark I. Stockman

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

We theoretically study the coherent dynamics of Dirac fermions at the surface of a 3D topological insulator (Bi2Se3) in the field of an ultrafast laser pulse. In the presence of the ultrafast pulse, which has a femtosecond time scale that is less than the characteristic electron scattering time in these materials, the electron dynamics is coherent. Because of the gapless dispersion relation, the electrons dynamics is highly irreversible, which is dramatically different from dielectrics (fused silica, quartz, and sapphire). Due to irreversibility, finite conduction band population does exist after the pulse ends. Within two-band k.p Hamiltonian, which includes cubic momentum hexagonal warping terms, the residual conduction band (RCB) population in the reciprocal space is highly anisotropic. The distribution of RCB population in the reciprocal space strongly depends on the polarization of the ultrafast laser pulse.

Original languageEnglish
Title of host publication20TH INTERNATIONAL CONFERENCE ON ELECTRON DYNAMICS IN SEMICONDUCTORS, OPTOELECTRONICS AND NANOSTRUCTURES (EDISON 20)
EditorsE Einarsson
PublisherIOP Publishing Ltd.
Number of pages4
DOIs
StatePublished - Jul 2017
Event20th International Conference on Electron Dynamics in Semiconductors, Optoelectronics and Nanostructures (EDISON) - Buffalo
Duration: 17 Jul 201721 Jul 2017

Publication series

NameJournal of Physics Conference Series
PublisherIOP PUBLISHING LTD
Volume906
ISSN (Print)1742-6588

Conference

Conference20th International Conference on Electron Dynamics in Semiconductors, Optoelectronics and Nanostructures (EDISON)
CityBuffalo
Period17/07/1721/07/17

Cite this