Effective mass suppression in a ferromagnetic two-dimensional electron liquid

Asgari, Reza; Gokmen, Tayfun; Tanatar, B.; Padmanabhan, Medini; Shayegan, M.

doi:10.1103/physrevb.79.235324

Cited by 18 publications

(29 citation statements)

References 37 publications

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“…25͒ and was very recently reproduced theoretically. 31,32 For all other combinations of spin and valley occupations, m ‫ء‬ increases with increasing r s . This is the trend observed in other 2DESs where either two valleys or spins are occupied.…”

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confidence: 94%

Contrast between spin and valley degrees of freedom

2010

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We measure the renormalized effective mass (m*) of interacting two-dimensional electrons confined to an AlAs quantum well while we control their distribution between two spin and two valley subbands. We observe a marked contrast between the spin and valley degrees of freedom: When electrons occupy two spin subbands, m* strongly depends on the valley occupation, but not vice versa. Combining our m* data with the measured spin and valley susceptibilities, we find that the renormalized effective Lande g-factor strongly depends on valley occupation, but the renormalized conduction-band deformation potential is nearly independent of the spin occupation.Comment: 4+ pages, 2 figure

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confidence: 94%

Contrast between spin and valley degrees of freedom

2010

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“…[24][25][26][27] This suppression was reproduced in subsequent, numerical theoretical work. 28,29 In this work we present measurements of m * in a dilute 2D hole system (2DHS) confined to a (311)A GaAs quantum well. We determine m * through analysis of the temperature dependence of the Shubnikov-de Haas (SdH) oscillations.…”

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confidence: 99%

Effective mass and spin susceptibility of dilute two-dimensional holes in GaAs

et al. 2011

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We report effective hole mass (m * ) measurements through analyzing the temperature dependence of Shubnikov-de Haas oscillations in dilute (density p ∼ 7 × 10 10 cm −2 , rs ∼ 6) two-dimensional (2D) hole systems confined to a 20 nm-wide, (311)A GaAs quantum well. The holes in this system occupy two nearly-degenerate spin subbands whose m * we measure to be ∼ 0.2 (in units of the free electron mass). Despite the relatively large rs in our 2D system, the measured m * is in reasonably good agreement with the results of our energy band calculations which do not take interactions into account. We then apply a sufficiently strong parallel magnetic field to fully depopulate one of the spin subbands, and measure m * for the populated subband. We find that this latter m * is close to the m * we measure in the absence of the parallel field. We also deduce the spin susceptibility of the 2D hole system from the depopulation field, and conclude that the susceptibility is enhanced by about 50% relative to the value expected from the band calculations.

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“…The values of m * from different perturbation expansions26, 28 and from QMC results12, 13, 29 differ significantly. Of the QMC methods used that of Ref.…”

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confidence: 94%

“…The GW‐SC calculations of Asgari et al, Ref. 26 have been supplemented with points read off from Figure 4 of Ref. 13, where recent QMC results are given.…”

Section: Correlation Corrections To the 2d‐effective Massmentioning

confidence: 99%

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2009

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Effective mass suppression in a ferromagnetic two-dimensional electron liquid

Cited by 18 publications

References 37 publications

Contrast between spin and valley degrees of freedom

Contrast between spin and valley degrees of freedom

Effective mass and spin susceptibility of dilute two-dimensional holes in GaAs

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