Giant spin-polarized current in a Dirac fermion system at cyclotron resonance

Abstract

We report on the observation of the giant spin-polarized photocurrent in HgTe/HgCdTe quantum well (QW) of critical thickness at which a Dirac spectrum emerges. Exciting QW of 6.6 nm width by terahertz (THz) radiation and sweeping magnetic field we detected a resonant photocurrent. Remarkably, the position of the resonance can be tuned from negative (-0.4 T) to positive (up to 1.2 T) magnetic fields by means of optical gating. The photocurent data, accompanied by measurements of radiation transmission as well as Shubnikov-de Haas and quantum Hall effects, give an evidence that the enhancement of the photocurrent is caused by cyclotron resonance in a Dirac fermion system. The developed theory shows that the current is spin polarized and originates from the spin dependent scattering of charge carriers heated by the radiation.

5 pages with 5 figures + 3 pages of supplementary material with 1 figure

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Cited by in corpus (44)

• 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
• Split Dirac cones in HgTe/CdTe quantum wells due to symmetry-enforced level anticrossing at interfaces
• Magnetic field effects on edge and bulk states in topological insulators based on HgTe/CdHgTe quantum wells with strong natural interface inversion asymmetry
• Resonant photovoltaic effect in doped magnetic semiconductors
• Terahertz photogalvanics in twisted bilayer graphene close to the second magic angle
• Persistent Optical Gating of a Topological Insulator
• Universal Faraday rotation in HgTe wells with critical thickness
• Quantum Oscillations of Photocurrents in HgTe Quantum Wells with Dirac and Parabolic Dispersions
• Terahertz electric field driven electric currents and ratchet effects in graphene
• Cyclotron resonance of single valley Dirac fermions in gapless HgTe quantum well
• High-frequency nonlinear transport and photogalvanic effects in two-dimensional topological insulators
• Probing topological transitions in HgTe/CdTe quantum wells by magneto-optical measurements
• Edge photocurrent driven by THz electric field in bi-layer graphene
• Temperature-dependent magnetospectroscopy of HgTe quantum wells
• Observation of terahertz-induced magnetooscillations in graphene
• Coherent ultrafast spin-dynamics probed in three dimensional topological insulators
• Giant ratchet magneto-photocurrent in graphene lateral superlattices
• Cyclotron resonance of the magnetic ratchet effect and second harmonic generation in bilayer graphene
• Unconventional Reentrant Quantum Hall Effect in a HgTe/CdHgTe Double Quantum Well
• Terahertz properties of Dirac fermions in HgTe films with optical doping
• Band Structure of Two-dimensional Dirac Semimetal from Cyclotron Resonance
• High frequency impact ionization and nonlinearity of photocurrent induced by intense terahertz radiation in HgTe-based quantum well structures
• Sign-alternating photoconductivity and magnetoresistance oscillations induced by terahertz radiation in HgTe quantum wells
• Ratchet transport of a two-dimensional electron gas at cyclotron resonance
• Edge photocurrent in bilayer graphene due to inter-Landau-level transitions
• Enhanced circular photogalvanic effect in HgTe quantum wells in the heavily inverted regime
• Time resolution and dynamic range of field effect transistor based terahertz detectors
• Terahertz photoresistivity of a high-mobility 3D topological insulator based on a strained HgTe film
• Terahertz Magnetospectroscopy of Cyclotron Resonances from Topological Surface States in Thick Films of Cd${}_x$Hg${}_{1-x}$Te
• Cyclotron- and magnetoplasmon resonances in bilayer graphene ratchets
• THz Photodetector using sideband-modulated transport through surface states of a 3D Topological Insulator
• Cyclotron resonance induced photogalvanic effect in surface states of 200 nm thick strained HgTe films
• Observation of anomalously strong penetration of terahertz electric field through terahertz-opaque gold films into a GaAs/AlGaAs quantum well
• Thermal generation of shift electric current
• Current induced by a tilted magnetic field in phosphorene under terahertz laser radiation
• Magnetophotogalvanic Effects Driven by Terahertz Radiation in CdHgTe Crystals with Kane Fermions
• Splitting of Dirac cones in HgTe quantum wells: Effects of crystallographic orientation, interface-, bulk-, and structure-inversion asymmetry
• Universal transparency and fine band structure near the Dirac point in HgTe quantum wells
• Circular polarization immunity of the cyclotron resonance photoconductivity in two-dimensional electron systems
• Impact ionization induced by terahertz radiation in HgTe quantum wells of critical thickness
• Unconventional quantum Hall effect in Floquet topological insulators
• All-optical band structure reconstruction and onset of Landau quantization of Dirac fermions
• HgTe quantum wells for QHE metrology under soft cryomagnetic conditions: permanent magnets and liquid ${}^{4}He$ temperatures