<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>g</mml:mi></mml:math>-factor modification in a bulk InGaAs epilayer by an in-plane electric field

Luengo-Kovac, Marta; Macmahon, Michael; Huang, Simon; Goldman, R. S.; Sih, Vanessa

doi:10.1103/physrevb.91.201110

Cited by 10 publications

(8 citation statements)

References 21 publications

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“…Note that, for both channel directions, this modification is symmetric on the field polarity (velocity direction). A similar behavior was measured in InGaAs epilayers 25 . However, the high mobility in our system lets us produce a stronger variation of 0.02 when increasing the drift velocity from zero to 10 µm/ns in considerably smaller electric fields.…”

Section: Experimental Measurementssupporting

confidence: 80%

Experimental analysis of the spin-orbit coupling dependence on the drift velocity of a spin packet

Kawahala,

Moraes,

Gusev

et al. 2020

Preprint

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Spin transport was studied in a two-dimensional electron gas hosted in a wide GaAs quantum well occupying two subbands. Using space and time Kerr rotation microscopy to image drifting spin packets under an in-plane accelerating electric field, optical injection and detection of spin polarization were achieved in a pump-probe configuration. The experimental data exhibited high spin mobility and long spin lifetimes allowing to obtain the spin-orbit fields as a function of the spin velocities. Surprisingly, above moderate electric fields of 0.4 V/cm with velocities higher than 2 µm/ns, we observed a dependence of both bulk and structure-related spin-orbit interactions on the velocity magnitude. A remarkable feature is the increase of the cubic Dresselhaus term to approximately half of the linear coupling when the velocity is raised to 10 µm/ns. In contrast, the Rashba coupling for both subbands decreases to about half of its value in the same range. These results yield new information for the application of drift models in spin-orbit fields and about limitations for the operation of spin transistors.

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Section: Experimental Measurementssupporting

confidence: 80%

Experimental analysis of the spin-orbit coupling dependence on the drift velocity of a spin packet

Kawahala,

Moraes,

Gusev

et al. 2020

Preprint

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“…The modification of the g factor by an in-plane electric field was reported recently. For bulk InGaAs epilayers, 53 they measured ∆g = 0.0053 and found that g increases with the drift velocity. For [110] oriented QWs, 54 the electrical variation of the g tensor was also found to depend on the external magnetic field and to increase with the current.…”

Section: Transverse Spin Transportmentioning

confidence: 99%

Macroscopic transverse drift of long current-induced spin coherence in two-dimensional electron gases

et al. 2016

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We imaged the transport of current-induced spin coherence in a two-dimensional electron gas confined in a triple quantum well. Nonlocal Kerr rotation measurements, based on the optical resonant amplification of the electrically-induced polarization, revealed a large spatial variation of the electron g factor and the efficient generation of a current-controlled spin-orbit field in a macroscopic Hall bar device. We observed coherence times in the nanoseconds range transported beyond half-millimeter distances in a direction transverse to the applied electric field. The measured long spin transport length can be explained by two material properties: large mean free path for charge diffusion in clean systems and enhanced spin-orbit coefficients in the triple well. arXiv:1605.06854v3 [cond-mat.mes-hall]

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“…Our data agrees with those reports as the g-factor decreases for electrons that drifted far from the current path. Nevertheless, we reached a variation of ∆g = 0.02 which could indicate a larger change on the drift velocity because ∆g ∝ V 2 d [199]. We noted that, at the longest transverse distance from the current path (y= 0.4 mm), we recovered the g-factor value measured at V d = 0 in Fig.…”

Section: Longitudinal Spin Transportsupporting

confidence: 57%

“…The modification of the g-factor by an in-plane electric field was reported recently. For bulk InGaAs epilayers [199], they measured ∆g = 0.0053 and found that g increases with the drift velocity.…”

Section: Longitudinal Spin Transportmentioning

confidence: 99%

Optical control and detection of spin coherence in multilayer systems.

Ullah¹

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Por fim, estudamos a deriva transversal macroscópica da longa coerência de spin induzida por corrente, através de medidas de Rotação de Kerr não-locais, baseadas na amplificação ressonanteótica da polarização eletricamente induzida. Observamos uma variação espacial significante do fator g e do tempo de vida da coerência, na escala de nanosegundos, deslocada distâncias de meio milímetro na direção transversa ao campo magnético aplicado. vii Contents Contents viii List of Figures xiii

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g-factor modification in a bulk InGaAs epilayer by an in-plane electric field

Cited by 10 publications

References 21 publications

Experimental analysis of the spin-orbit coupling dependence on the drift velocity of a spin packet

Experimental analysis of the spin-orbit coupling dependence on the drift velocity of a spin packet

Macroscopic transverse drift of long current-induced spin coherence in two-dimensional electron gases

Optical control and detection of spin coherence in multilayer systems.

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