Standard

Photogalvanic probing of helical edge channels in two-dimensional HgTe topological insulators. / Dantscher, K. M.; Kozlov, D. A.; Scherr, M. T. et al.

In: Physical Review B, Vol. 95, No. 20, 201103, 08.05.2017.

Research output: Contribution to journal › Article › peer-review

Harvard

Dantscher, KM, Kozlov, DA, Scherr, MT, Gebert, S, Bärenfänger, J, Durnev, MV, Tarasenko, SA, Bel'Kov, VV, Mikhailov, NN, Dvoretsky, SA, Kvon, ZD, Ziegler, J, Weiss, D & Ganichev, SD 2017, 'Photogalvanic probing of helical edge channels in two-dimensional HgTe topological insulators', Physical Review B, vol. 95, no. 20, 201103. https://doi.org/10.1103/PhysRevB.95.201103

APA

Dantscher, K. M., Kozlov, D. A., Scherr, M. T., Gebert, S., Bärenfänger, J., Durnev, M. V., Tarasenko, S. A., Bel'Kov, V. V., Mikhailov, N. N., Dvoretsky, S. A., Kvon, Z. D., Ziegler, J., Weiss, D., & Ganichev, S. D. (2017). Photogalvanic probing of helical edge channels in two-dimensional HgTe topological insulators. Physical Review B, 95(20), [201103]. https://doi.org/10.1103/PhysRevB.95.201103

Vancouver

Dantscher KM, Kozlov DA, Scherr MT, Gebert S, Bärenfänger J, Durnev MV et al. Photogalvanic probing of helical edge channels in two-dimensional HgTe topological insulators. Physical Review B. 2017 May 8;95(20):201103. doi: 10.1103/PhysRevB.95.201103

Author

Dantscher, K. M. ; Kozlov, D. A. ; Scherr, M. T. et al. / Photogalvanic probing of helical edge channels in two-dimensional HgTe topological insulators. In: Physical Review B. 2017 ; Vol. 95, No. 20.

BibTeX

@article{4fe1a5b65d064eadab6eb51ed349bdb2,
title = "Photogalvanic probing of helical edge channels in two-dimensional HgTe topological insulators",
abstract = "We report on the observation of a circular photogalvanic current excited by terahertz laser radiation in helical edge channels of two-dimensional (2D) HgTe topological insulators (TIs). The direction of the photocurrent reverses by switching the radiation polarization from a right-handed to a left-handed one and, for fixed photon helicity, is opposite for the opposite edges. The photocurrent is detected in a wide range of gate voltages. With decreasing the Fermi level below the conduction band bottom, the current emerges, reaches a maximum, decreases, changes its sign close to the charge neutrality point (CNP), and again rises. Conductance measured over a ≈3μm distance at CNP approaches 2e2/h, the value characteristic for ballistic transport in 2D TIs. The data reveal that the photocurrent is caused by photoionization of helical edge electrons to the conduction band. We discuss the microscopic model of this phenomenon and compare calculations with experimental data.",
keywords = "QUANTUM-WELLS, CURRENTS",
author = "Dantscher, {K. M.} and Kozlov, {D. A.} and Scherr, {M. T.} and S. Gebert and J. B{\"a}renf{\"a}nger and Durnev, {M. V.} and Tarasenko, {S. A.} and Bel'Kov, {V. V.} and Mikhailov, {N. N.} and Dvoretsky, {S. A.} and Kvon, {Z. D.} and J. Ziegler and D. Weiss and Ganichev, {S. D.}",
year = "2017",
month = may,
day = "8",
doi = "10.1103/PhysRevB.95.201103",
language = "English",
volume = "95",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "20",

}

RIS

TY - JOUR

T1 - Photogalvanic probing of helical edge channels in two-dimensional HgTe topological insulators

AU - Dantscher, K. M.

AU - Kozlov, D. A.

AU - Scherr, M. T.

AU - Gebert, S.

AU - Bärenfänger, J.

AU - Durnev, M. V.

AU - Tarasenko, S. A.

AU - Bel'Kov, V. V.

AU - Mikhailov, N. N.

AU - Dvoretsky, S. A.

AU - Kvon, Z. D.

AU - Ziegler, J.

AU - Weiss, D.

AU - Ganichev, S. D.

PY - 2017/5/8

Y1 - 2017/5/8

N2 - We report on the observation of a circular photogalvanic current excited by terahertz laser radiation in helical edge channels of two-dimensional (2D) HgTe topological insulators (TIs). The direction of the photocurrent reverses by switching the radiation polarization from a right-handed to a left-handed one and, for fixed photon helicity, is opposite for the opposite edges. The photocurrent is detected in a wide range of gate voltages. With decreasing the Fermi level below the conduction band bottom, the current emerges, reaches a maximum, decreases, changes its sign close to the charge neutrality point (CNP), and again rises. Conductance measured over a ≈3μm distance at CNP approaches 2e2/h, the value characteristic for ballistic transport in 2D TIs. The data reveal that the photocurrent is caused by photoionization of helical edge electrons to the conduction band. We discuss the microscopic model of this phenomenon and compare calculations with experimental data.

AB - We report on the observation of a circular photogalvanic current excited by terahertz laser radiation in helical edge channels of two-dimensional (2D) HgTe topological insulators (TIs). The direction of the photocurrent reverses by switching the radiation polarization from a right-handed to a left-handed one and, for fixed photon helicity, is opposite for the opposite edges. The photocurrent is detected in a wide range of gate voltages. With decreasing the Fermi level below the conduction band bottom, the current emerges, reaches a maximum, decreases, changes its sign close to the charge neutrality point (CNP), and again rises. Conductance measured over a ≈3μm distance at CNP approaches 2e2/h, the value characteristic for ballistic transport in 2D TIs. The data reveal that the photocurrent is caused by photoionization of helical edge electrons to the conduction band. We discuss the microscopic model of this phenomenon and compare calculations with experimental data.

KW - QUANTUM-WELLS

KW - CURRENTS

UR - http://www.scopus.com/inward/record.url?scp=85024391077&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.95.201103

DO - 10.1103/PhysRevB.95.201103

M3 - Article

AN - SCOPUS:85024391077

VL - 95

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 20

M1 - 201103

ER -

ID: 10092271