Quantum Oscillations of Photocurrents in HgTe Quantum Wells with Dirac and Parabolic Dispersions

Abstract

We report on the observation of magneto-oscillations of terahertz radiation induced photocurrent in HgTe/HgCdTe quantum wells (QWs) of different widths, which are characterized by a Dirac-like, inverted and normal parabolic band structure. The photocurrent data are accompanied by measurements of photoresistance (photoconductivity), radiation transmission, as well as magneto-transport. We develop a microscopic model of a cyclotron-resonance assisted photogalvanic effect, which describes main experimental findings. We demonstrate that the quantum oscillations of the photocurrent are caused by the crossing of Fermi level by Landau levels resulting in the oscillations of spin polarization and electron mobilities in spin subbands. Theory explains a photocurrent direction reversal with the variation of magnetic field observed in experiment. We describe the photoconductivity oscillations related with the thermal suppression of the Shubnikov-de Haas effect.

arXiv comment16 pages, 13 figures

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Cited by in corpus (16)

• Photon Drag Effect in (Bi${}_{1-x}$Sb${}_x$)${}_2$Te${}_3$ Three Dimensional Topological Insulators
• Cyclotron Resonance Assisted Photocurrents in Surface States of a 3D Topological Insulator Based on a Strained High Mobility HgTe Film
• Universal Faraday rotation in HgTe wells with critical thickness
• Terahertz electric field driven electric currents and ratchet effects in graphene
• Probing topological transitions in HgTe/CdTe quantum wells by magneto-optical measurements
• Observation of terahertz-induced magnetooscillations in graphene
• Band structure of a HgTe-based three-dimensional topological insulator
• Giant ratchet magneto-photocurrent in graphene lateral superlattices
• Band Structure of Two-dimensional Dirac Semimetal from Cyclotron Resonance
• Sign-alternating photoconductivity and magnetoresistance oscillations induced by terahertz radiation in HgTe quantum wells
• Terahertz properties of Dirac fermions in HgTe films with optical doping
• THz Photodetector using sideband-modulated transport through surface states of a 3D Topological Insulator
• Transformation of an energy spectrum and wave functions in the crossover from two- to three-dimensional topological insulator in HgTe quantum wells: long and thorny way
• Magnetophotogalvanic Effects Driven by Terahertz Radiation in CdHgTe Crystals with Kane Fermions
• All-optical band structure reconstruction and onset of Landau quantization of Dirac fermions
• Quadrupolar photovoltaic effect in the terahertz range in a two-dimensional spin-3/2 hole system