In-plane magnetoresistance studies of an extremely coupled double quantum well

Blount, M. A.; Simmons, J. A.; Lyo, S. K.

doi:10.1103/physrevb.57.14882

Cited by 8 publications

(5 citation statements)

References 7 publications

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“…1(C) and (D)). A kink in the B || -magnetoresistance has been previously associated with the splitting of Fermi contour [9]. Here, we observe two kinks, suggesting a spin-dependent splitting of Fermi contours.…”

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confidence: 75%

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Splitting of the Fermi Contour of Quasi-2D Electrons in Parallel Magnetic Fields

et al. 2015

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In a quasi two-dimensional electron system with non-zero layer thickness, a parallel magnetic field can couple to the out-of-plane electron motion and lead to a severe distortion and eventual splitting of the Fermi contour. Here we directly and quantitatively probe this evolution through commensurability and Shubnikov-de Haas measurements on electrons confined to a 40-nm-wide GaAs (001) quantum well. We are able to observe the Fermi contour splitting phenomenon, in good agreement with the results of semi-classical calculations. Experimentally we also observe intriguing features, suggesting magnetic-breakdown-type behavior when the Fermi contour splits.

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confidence: 75%

“…Several transport studies on 2DESs, confined to coupled double- [4][5][6][7][8][9] and triple-QW systems [10] have previously explored the Fermi contour splitting. In these studies, features such as kinks in the B || -induced magnetoresistance and inter-layer tunneling were associated with the splitting.…”

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confidence: 99%

Splitting of the Fermi Contour of Quasi-2D Electrons in Parallel Magnetic Fields

et al. 2015

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“…The B dependence of the diffusive conductance obtained for small ប x is similar to that observed recently for two-dimensional double QW's except for the superimposed quantum oscillations and the dip. 8,10,18,19 The oscillations and the dip are the unique signatures of the discrete sublevels.…”

Section: Discussionmentioning

confidence: 99%

Multisublevel magnetoquantum conductance in single and coupled double quantum wires

Lyo

Huang

2001

Phys. Rev. B

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We study the ballistic and diffusive magnetoquantum transport using a typical quantum point contact geometry for single and tunnel-coupled double wires that are wide ͑Շ1 m͒ in one perpendicular direction with densely populated sublevels and extremely confined in the other perpendicular ͑i.e., growth͒ direction. A general analytic solution to the Boltzmann equation is presented for multisublevel elastic scattering at low temperatures. The solution is employed to study interesting magnetic-field dependent behavior of the conductance such as a large enhancement and quantum oscillations of the conductance for various structures and field orientations. These phenomena originate from the following field-induced properties: magnetic confinement, displacement of the initial-and final-state wave functions for scattering, variation of the Fermi velocities, mass enhancement, depopulation of the sublevels and anticrossing ͑in double quantum wires͒. The magnetoconductance is strikingly different in long diffusive ͑or rough, dirty͒ wires from the quantized conductance in short ballistic ͑or clean͒ wires. Numerical results obtained for the rectangular confinement potentials in the growth direction are satisfactorily interpreted in terms of the analytic solutions based on harmonic confinement potentials. Some of the predicted features of the field-dependent diffusive and quantized conductances are consistent with recent data from GaAs/Al x Ga 1Ϫx As double quantum wires.

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“…7 The magnetoresistance oscillatory phenomenon has attracted the most attention among these magneticfield-induced modifications in the bilayer 2DEG system. [1][2][3][4][5][6] There are many reports both on experimental and theoretical aspects in the last decade. For example, Simmons et al 1 and Lyo 2 have found the conductance modulation in DQW due to in-plane magnetic-field-induced anticrossing, and within the approximation of the k-independent electron-impurity scattering potential, the experimental results were theoretically analyzed.…”

Section: Introductionmentioning

confidence: 99%

Transport properties of a bilayer two-dimensional electron gas under an in-plane magnetic field: Monte Carlo simulations

Guo

Cao

2007

Phys. Rev. B

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Using an ensemble Monte Carlo method, we have theoretically investigated the transport properties of a GaAs/ ͑Al, Ga͒As double quantum well bilayer two-dimensional electron gas under an in-plane magnetic field. Intrasubband and intersubband electron-phonon interactions through polar optical and acoustic phonons are included in the simulation. The effects of the magnetic-field-induced distortions of energy dispersion on the scattering rate are fully taken into account. Our results show that the emergence of magnetic-field-induced negative effective mass does not affect appreciably the electron drift velocity ͑v d ͒ as a function of electric field ͑E͒, and no dv d / dE Ͻ 0 region appears on the v d -E curve. The oscillation of v d with magnetic fields is found, which is qualitatively in accordance with experimental results.

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In-plane magnetoresistance studies of an extremely coupled double quantum well

Cited by 8 publications

References 7 publications

Splitting of the Fermi Contour of Quasi-2D Electrons in Parallel Magnetic Fields

Splitting of the Fermi Contour of Quasi-2D Electrons in Parallel Magnetic Fields

Multisublevel magnetoquantum conductance in single and coupled double quantum wires

Transport properties of a bilayer two-dimensional electron gas under an in-plane magnetic field: Monte Carlo simulations

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