Positive quantum magnetoresistance in tilted magnetic field

Mayer, William; Ghazaryan, Areg; Ghaemi, Pouyan; Vitkalov, Sergey; Быков, А. А.

doi:10.1103/physrevb.94.195312

Cited by 11 publications

(22 citation statements)

References 53 publications

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“…In particular modified magnetoresistance, R m xx at α=88.6 degree decreases with the perpendicular field, while the original dependence does increase at B ⊥ >0.05 T. The 28 Below we analyze quantitatively the angular evolution of the oscillating (MISO) and non-oscillating (related to QPMR) contents of the magnetoresistance. Figure 3(a) presents the non-oscillating content of the normalized magnetoresistance, R * QP MR /R D , obtained at different angles in a broad range of the perpendicular magnetic fields.…”

Section: Resultsmentioning

confidence: 99%

“…This result agrees with the one obtained in the systems with a single populated subband. 28 Figure 3(b) presents the oscillating content of the magnetoresistance, which is related to MISO. The figure shows strong decrease of MISO at high angles.…”

Section: Resultsmentioning

confidence: 99%

“…27 The later is recently investigated in tilted magnetic fields. 28 These investigations have demonstrated that the QPMR magnitude decreases significantly with application of in-plane magnetic field. The QPMR decrease is found to be strongly correlated with the reduction of SdH amplitude indicating the spin origin of the effect.…”

Section: Introductionmentioning

confidence: 99%

“…A scattering assisted spin mixing between different subbands is postulated to provide the correlation between the angular evolutions of SdH oscillations and QPMR observed in the experiment. 28 Within this model the absence of the scattering between spin subbands would lead to the absence of an angular evolution of the QPMR associated with the Zeeman effect in contrast to the angular dependence of SdH oscillations. The origin of the spin mixing requires further investigations.…”

Section: Model Of Quantum Electron Transportmentioning

confidence: 99%

“…An account of the Zeeman splitting for QPMR is proposed in Ref. [ 28 ] for 2D systems with a single subband populated. The proposed model utilizes a similarity of QPMR and MagnetoInterSubband (MISO) resistance oscillations.…”

Section: Model Of Quantum Electron Transportmentioning

confidence: 99%

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Quantum electron transport in magnetically entangled subbands

2017

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Transport properties of highly mobile 2D electrons in symmetric GaAs quantum wells with two populated subbands placed in titled magnetic fields are studied at high temperatures. Quantum positive magnetoresistance (QPMR) and magneto-intersubbands resistance oscillations (MISO) are observed in quantizing magnetic fields, B ⊥ , applied perpendicular to the 2D layer. QPMR displays contributions from electrons with considerably different quantum lifetimes, τ (1,2) q , confirming the presence of two subbands in the studied system. MISO evolution with B ⊥ agrees with the obtained quantum scattering times only if an additional reduction of the MISO magnitude is applied at small magnetic fields. This indicates the presence of a yet unknown mechanism leading to MISO damping. Application of in-plane magnetic field produces a strong decrease of both QPMR and MISO magnitude. The reduction of QPMR is explained by spin splitting of Landau levels indicating g-factor, g ≈0.4, which is considerably less than the g-factor found in GaAs quantum well with a single subband populated. In contrast to QPMR the decrease of MISO magnitude is largely related to the in-plane magnetic field induced entanglement between quantum levels in different subbands that, in addition, increases the MISO period.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Model Of Quantum Electron Transportmentioning

confidence: 99%

Section: Model Of Quantum Electron Transportmentioning

confidence: 99%

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Quantum electron transport in magnetically entangled subbands

2017

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High-temperature magneto-inter-chirality oscillations in 2D systems with strong spin–orbit coupling

Raikh

2023

Solid State Communications

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Study of narrow negative magnetoresistance effect in ultra-high mobility GaAs/AlGaAs 2DES under microwave photo-excitation

Samaraweera

Gunawardana

Nanayakkara

et al. 2020

Sci Rep

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The microwave-induced change in the narrow negative magnetoresistance effect that appears around zero magnetic field in high mobility GaAs/AlGaAs 2DES (≈10 7 cm 2 /Vs) is experimentally examined as a function of incident microwave power at a fixed bath temperature. The experimental results indicate that the narrow negative magnetoresistance effect exhibits substantially increased broadening with increasing microwave intensity. These magnetoresistance data were subjected to lineshape fits to extract possible variation of characteristic lengths with microwave intensity; the results suggest that characteristic lengths decrease by up to 50% upon increasing microwave power up to about 8 mW. We also examine the change in effective electron temperature, T e , due to the photo-excitation in the absence of a magnetic field. Combining these results suggests a correlation between electron heating and the observed change in the fit extracted characteristic lengths.

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Positive quantum magnetoresistance in tilted magnetic field

Cited by 11 publications

References 53 publications

Quantum electron transport in magnetically entangled subbands

Quantum electron transport in magnetically entangled subbands

High-temperature magneto-inter-chirality oscillations in 2D systems with strong spin–orbit coupling

Study of narrow negative magnetoresistance effect in ultra-high mobility GaAs/AlGaAs 2DES under microwave photo-excitation

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