title: Room-temperature high-frequency transport of dirac fermions in epitaxially grown Sb2Te3- and Bi2Te3-based topological insulators.
abstract: We report on the observation of photogalvanic effects in epitaxially grown Sb2Te3 and Bi2Te3 three-dimensional (3D) topological insulators (TI). We show that asymmetric scattering of Dirac fermions driven back and forth by the terahertz electric field results in a dc electric current. Because of the "symmetry filtration" the dc current is generated by the surface electrons only and provides an optoelectronic access to probe the electron transport in TI, surface domains orientation, and details of electron scattering in 3D TI even at room temperature.
authors.affiliation: Terahertz Center, University of Regensburg, 93040 Regensburg, Germany.
authors.forename: P
authors.initials: P
authors.lastname: Olbrich
authors.affiliation: Ioffe Physical-Technical Institute, 194021 St. Petersburg, Russia.
authors.forename: L E
authors.initials: LE
authors.lastname: Golub
authors.affiliation: Terahertz Center, University of Regensburg, 93040 Regensburg, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Herrmann
authors.affiliation: Terahertz Center, University of Regensburg, 93040 Regensburg, Germany.
authors.forename: S N
authors.initials: SN
authors.lastname: Danilov
authors.affiliation: Terahertz Center, University of Regensburg, 93040 Regensburg, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Plank
authors.affiliation: Ioffe Physical-Technical Institute, 194021 St. Petersburg, Russia.
authors.forename: V V
authors.initials: VV
authors.lastname: Bel'kov
authors.affiliation: Jülich Aachen Research Alliance (JARA-FIT), Leo Brandt Straße, 52425 Jülich, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Mussler
authors.affiliation: Jülich Aachen Research Alliance (JARA-FIT), Leo Brandt Straße, 52425 Jülich, Germany.
authors.forename: Ch
authors.initials: Ch
authors.lastname: Weyrich
authors.affiliation: Jülich Aachen Research Alliance (JARA-FIT), Leo Brandt Straße, 52425 Jülich, Germany.
authors.forename: C M
authors.initials: CM
authors.lastname: Schneider
authors.affiliation: Jülich Aachen Research Alliance (JARA-FIT), Leo Brandt Straße, 52425 Jülich, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Kampmeier
authors.affiliation: Jülich Aachen Research Alliance (JARA-FIT), Leo Brandt Straße, 52425 Jülich, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Grützmacher
authors.affiliation: Jülich Aachen Research Alliance (JARA-FIT), Leo Brandt Straße, 52425 Jülich, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Plucinski
authors.affiliation: Jülich Aachen Research Alliance (JARA-FIT), Leo Brandt Straße, 52425 Jülich, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Eschbach
authors.affiliation: Terahertz Center, University of Regensburg, 93040 Regensburg, Germany.
authors.forename: S D
authors.initials: SD
authors.lastname: Ganichev