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Tan, Yan‐Wen; Zhu, J.; Störmer, H. L.; Pfeiffer, L. N.; Baldwin, K. W.; West, K. W.

doi:10.1103/physrevlett.94.016405

Cited by 108 publications

(120 citation statements)

References 23 publications

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“…This is surprising. Previous studies on 2D electron systems confined to Si-MOSFETs, 15 to GaAs, 21,22 or to narrow (width < 5 nm) AlAs quantum wells 27 have reported an enhancement of m * by about 50% over the band value for a comparable value of r s (∼ 6). The reason for the lack of m * enhancement in 2D holes is not obvious but is possibly related to the holes' band structure and effective spin j = 3/2, as discussed in Ref.…”

Section: Discussion Of Effective Mass Datamentioning

confidence: 99%

“…In the highly interacting, dilute regime (r s > ∼ 3), χ * and m * are typically enhanced compared to the band values and increase with increasing r s , as confirmed both theoretically [1][2][3][4][5][6][7][8] and experimentally. [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] Besides r s , the spin and/or valley degrees of freedom also play an important role in the re-normalization of m * and χ * since they modify the exchange interaction. 5,6,17,[24][25][26][27] In particular, it was recently demonstrated that when a 2D electron system is fully spin and valley polarized, m * is suppressed compared to its band value.…”

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confidence: 99%

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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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Section: Discussion Of Effective Mass Datamentioning

confidence: 99%

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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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“…Shubnikov-de Haas oscillations are sensitive to the quasiparticle mass 20,[35][36][37] , but to our knowledge no clear signatures of the anisotropic bands Fermi surfaces have been reported in SrTiO 3 twodimensional electron gases 47 . When the mass is large, Landau-level spacing is small.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…We have successfully compared both Eqs. (37) and (38) against the full G 0 W -RPA numerical calculations, and when these expressions are substituted into Eqs. (26) and (27) we confirm that FSSM in the single-band anisotropic 2DEG saturates at large r s .…”

Section: B Fssm At Low Electron Densitymentioning

confidence: 99%

“…(6) yields the many-body contribution to the energy of the quasiparticle state. The quasiparticle energy can be measured by taking angle-resolved photoemission spectra 17,18 , and more indirectly by performing magneto-transport measurements [35][36][37] . The G 0 W approach, which we apply below, provides a successful 15,17,26,[38][39][40] approximation for the quasiparticle self-energy in electronic systems in which long-range Coulomb interactions play an essential role.…”

Section: The Quasiparticle Self-energy Inmentioning

confidence: 99%

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Quasiparticle mass enhancement and Fermi surface shape modification in oxide two-dimensional electron gases

Tolsma¹,

Principi²,

Asgari³

et al. 2016

Phys. Rev. B

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We propose a model intended to qualitatively capture the electron-electron interaction physics of two-dimensional electron gases formed near transition-metal oxide heterojunctions containing t2g electrons with a density much smaller than one electron per metal atom. Two-dimensional electron systems of this type can be described perturbatively using a GW approximation which predicts that Coulomb interactions enhance quasiparticle effective masses more strongly than in simple twodimensional electron gases, and that they reshape the Fermi surface, reducing its anisotropy.

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The classical‐map hyper‐netted‐chain (CHNC) method and associated novel density‐functional techniques for warm dense matter

Dharma‐wardana

2011

Int J of Quantum Chemistry

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ABSTRACT:The advent of short-pulse lasers, nanotechnology, as well as shock-wave techniques have created new states of matter (e.g., warm dense matter) that call for new theoretical tools. Ion correlations, electron correlations, as well as bound states, continuum states, partial degeneracies and quasi-equilibrium systems need to be addressed. Bogoliubov's ideas of timescales can be used to discuss the quasi-thermodynamics of nonequilibrium systems. A rigorous approach to the associated many-body problem turns out to be the computation of the underlying pair-distribution functions g ee , g ei , and g ii , that directly yield nonlocal exchange-correlation potentials, free energies etc., valid within the timescales of each evolving system. An accurate classical map of the strongly-quantum uniform electron-gas problem given by Dharma-wardana and Perrot is reviewed. This replaces the quantum electrons at T = 0 by an equivalent classical fluid at a finite temperature T q , and having the same correlation energy. The classical map is used with classical molecular dynamics (CMMD) or hyper-netted-chain integral equations (CHNC) to determine the pair-distribution functions (PDFs), and hence their thermodynamic and linear transport properties. The CHNC is very efficient for calculating the PDFs of uniform systems, while CMMD is more adapted to nonuniform systems. Applications to 2D and 3D quantum fluids, Si metal-oxide-field-effect transistors, Al plasmas, shock-compressed deuterium, two-temperature plasmas, pseudopotentials, as well as calculations for parabolic quantum dots are reviewed.

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Measurements of the Density-Dependent Many-Body Electron Mass in Two DimensionalGaAs/AlGa
Yan‐Wen Tan
¹
,
J. Zhu
²
,
H. L. Störmer
³

et al.

Cited by 108 publications

References 23 publications

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

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

Quasiparticle mass enhancement and Fermi surface shape modification in oxide two-dimensional electron gases

The classical‐map hyper‐netted‐chain (CHNC) method and associated novel density‐functional techniques for warm dense matter

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Measurements of the Density-Dependent Many-Body Electron Mass in Two DimensionalGaAs/AlGaYan‐Wen Tan1, J. Zhu2, H. L. Störmer3 et al.

Cited by 108 publications

References 23 publications

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

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

Quasiparticle mass enhancement and Fermi surface shape modification in oxide two-dimensional electron gases

The classical‐map hyper‐netted‐chain (CHNC) method and associated novel density‐functional techniques for warm dense matter

Contact Info

Product

Resources

About

Measurements of the Density-Dependent Many-Body Electron Mass in Two DimensionalGaAs/AlGa
Yan‐Wen Tan
¹
,
J. Zhu
²
,
H. L. Störmer
³

et al.