Terahertz detection of magnetic field-driven topological phase transition in HgTe-based transistors

Journal Article · Mon Oct 12 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4932943· OSTI ID:22482241

Kadykov, A. M. ^[1]; Consejo, C.; Ruffenach, S.; Marcinkiewicz, M.; Desrat, W.; Dyakonova, N.; Knap, W. ^[1]; Viti, L.; Vitiello, M. S. ^[2]; Krishtopenko, S. S.; Morozov, S. V.; Gavrilenko, V. I. ^[3]; Mikhailov, N. N.; Dvoretsky, S. A. ^[4]

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1. Laboratoire Charles Coulomb (L2C), UMR CNRS 5221, Universite Montpellier, 34095 Montpellier (France)
2. NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, I-56127 Pisa (Italy)
3. Institute for Physics of Microstructures, Russian Academy of Sciences, GSP-105, Nizhny Novgorod 603950 (Russian Federation)
4. Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrent'eva 13, Novosibirsk 630090 (Russian Federation)

We report on terahertz photoconductivity under magnetic field up to 16 T of field effect transistor based on HgTe quantum well (QW) with an inverted band structure. We observe pronounced cyclotron resonance and Shubnikov-de Haas-like oscillations, indicating a high mobility electron gas in the transistor channel. We discover that nonlinearity of the transistor channel allows for observation of characteristic features in photoconductivity at critical magnetic field corresponding to the phase transition between topological quantum spin Hall and trivial quantum Hall states in HgTe QW. Our results pave the way towards terahertz topological field effect transistors.

• OSTI ID: 22482241
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 15 Vol. 107; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CYCLOTRON RESONANCE
DETECTION
ELECTRON GAS
FIELD EFFECT TRANSISTORS
MAGNETIC FIELDS
MERCURY TELLURIDES
MOBILITY
NONLINEAR PROBLEMS
OSCILLATIONS
PHASE TRANSFORMATIONS
PHOTOCONDUCTIVITY
QUANTUM WELLS
SPIN
TOPOLOGY