Gate control of low-temperature spin dynamics in two-dimensional hole systems

Kugler, M.; Andlauer, Till F. M.; Korn, Tobias; Wagner, A.; Fehringer, S.; Schulz, Robert; Kubová, M.; Gerl, Christian; Schuh, Dieter; Wegscheider, Werner; Vogl, P.; Schüller, Christian

doi:10.1103/physrevb.80.035325

Cited by 38 publications

(65 citation statements)

References 24 publications

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“…This property has often and successfully been used for the analysis of spin-dependent phenomena. [34][35][36] Therefore, we studied the MPGE in a set of structures with QW widths varying from 4 to 30 nm.…”

Section: Introductionmentioning

confidence: 99%

Spin and orbital mechanisms of the magnetogyrotropic photogalvanic effects in GaAs/AlxGa1−xAs quantum well structures

et al. 2011

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We report on the study of the linear and circular magnetogyrotropic photogalvanic effect (MPGE) in GaAs/AlGaAs quantum well structures. Using the fact that in such structures the Landé factor g * depends on the quantum well (QW) width and has different signs for narrow and wide QWs, we succeeded to separate spin and orbital contributions to both MPGEs. Our experiments show that, for most QW widths, the MPGEs are mainly driven by spin-related mechanisms, which results in a photocurrent proportional to the g * factor. In structures with a vanishingly small g * factor, however, linear and circular MPGE are also detected, proving the existence of orbital mechanisms.

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Section: Introductionmentioning

confidence: 99%

Spin and orbital mechanisms of the magnetogyrotropic photogalvanic effects in GaAs/AlxGa1−xAs quantum well structures

et al. 2011

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“…This makes spin coherence very fragile, which can destroy information before it can be processed [8,9]. In this regard, a 2DHG would have an advantage, as the p-type hole valence band has a reduced hyperfine interaction with the nuclei, leading to longer spin coherence times for holes [10,11]. Furthermore, the Rashba effect (electric-field-induced spin splitting) can be made much stronger in a 2DHG than in a 2DEG [12].…”

Section: Indiamentioning

confidence: 99%

“…From the slopes of the subbands at the Fermi level, one can determine the semiclassical cyclotron masses. Assuming non-parabolic subbands, we then obtained an approximate effective mass of 0.28m e from the slope of the highest HH band by averaging over the [11] and [10] directions. However, as was shown in ref.…”

Section: Indiamentioning

confidence: 99%

Terahertz magneto-optical spectroscopy of a two-dimensional hole gas

Kamaraju

Pan

Ekenberg³

et al. 2015

Applied Physics Letters

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We have used terahertz (THz) magneto-optical spectroscopy to investigate the cyclotron resonance in high mobility two-dimensional electron and hole systems. Our experiments reveal long-lived (~20 ps) coherent oscillations in the measured signal in the presence of a perpendicular magnetic field. The cyclotron frequency extracted from the oscillations varies linearly with magnetic field for a two-dimensional electron gas (2DEG), as expected. However, we find that the complex non-parabolic valence band structure in a two-dimensional hole gas (2DHG) causes the cyclotron frequency and effective mass to vary nonlinearly with the magnetic field, as verified by multiband Landau level calculations. This is the first time that THz magnetooptical spectroscopy has been used to study 2DHG, and we expect that these results will motivate further studies of these unique 2D nanosystems. PACS number(s): 78.67. De, 76.40.+b,

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“…[1][2][3][4][5][6][7][8][9] It is well known that the 2DHG dispersion is characterized by a strong spin-orbit interaction, which can lead to spin-splitting of the bands even in the absence of an external magnetic field. This effect makes such systems very interesting for spintronic applications.…”

Section: Introductionmentioning

confidence: 99%

Voltage- and Light-Controlled Spin Properties of a Two-Dimensional Hole Gas in p-Type GaAs/AlAs Resonant Tunneling Diodes

Galeti

Gobato

Brasil

et al. 2018

Journal of Elec Materi

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We have investigated the spin properties of a two-dimensional hole gas (2DHG) formed at the contact layer of a p-type GaAs/AlAs resonant tunneling diode (RTD). We have measured the polarized-resolved photoluminescence of the RTD as a function of bias voltage, laser intensity and external magnetic field up to 15T. By tuning the voltage and the laser intensity, we are able to change the spin-splitting from the 2DHG from almost 0 meV to 5 meV and its polarization degree from À 40% to + 50% at 15T. These results are attributed to changes of the local electric field applied to the two-dimensional gas which affects the valence band and the hole Rashba spin-orbit effect.

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Gate control of low-temperature spin dynamics in two-dimensional hole systems

Cited by 38 publications

References 24 publications

Spin and orbital mechanisms of the magnetogyrotropic photogalvanic effects in GaAs/AlxGa1−xAs quantum well structures

Spin and orbital mechanisms of the magnetogyrotropic photogalvanic effects in GaAs/AlxGa1−xAs quantum well structures

Terahertz magneto-optical spectroscopy of a two-dimensional hole gas

Voltage- and Light-Controlled Spin Properties of a Two-Dimensional Hole Gas in p-Type GaAs/AlAs Resonant Tunneling Diodes

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