Correlation Effects on the Coupled Plasmon Modes of a Double Quantum Well

Hill, N.P.R.; Nicholls, J.E.; Linfield, Edmund H.; Pepper, M.; Ritchie, D. A.; Jones, G. A. C.; Hu, Ben Yu‐Kuang; Flensberg, Karsten

doi:10.1103/physrevlett.78.2204

Cited by 102 publications

(117 citation statements)

References 21 publications

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“…While the theoretical prediction by Flensberg and Hu 22 of a strong enhancement of drag by plasmons has been experimentally verified 19 in high-density electron samples, important differences have been reported 20 from the results obtained within the random phase approximation ͑RPA͒.…”

Section: Introductionmentioning

confidence: 95%

“…The carrier interaction effects on drag have been addressed previously in several experimental [18][19][20] and theoretical [21][22][23] papers. While the theoretical prediction by Flensberg and Hu 22 of a strong enhancement of drag by plasmons has been experimentally verified 19 in high-density electron samples, important differences have been reported 20 from the results obtained within the random phase approximation ͑RPA͒.…”

Section: Introductionmentioning

confidence: 99%

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Exchange and correlation effects on plasmon dispersions and Coulomb drag in low-density electron bilayers

et al. 2007

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We investigate the effect of exchange and correlation ͑XC͒ on the plasmon spectrum and the Coulomb drag between spatially separated low-density two-dimensional electron layers. We adopt a different approach, which employs dynamic XC kernels in the calculation of the bilayer plasmon spectra and of the plasmon-mediated drag, and static many-body local field factors in the calculation of the particle-hole contribution to the drag. The spectrum of bilayer plasmons and the drag resistivity are calculated in a broad range of temperatures taking into account both intra-and interlayer correlation effects. We observe that both plasmon modes are strongly affected by XC corrections. After the inclusion of the complex dynamic XC kernels, a decrease of the electron density induces shifts of the plasmon branches in opposite directions. This is in stark contrast with the tendency observed within random phase approximation that both optical and acoustical plasmons move away from the boundary of the particle-hole continuum with a decrease in the electron density. We find that the introduction of XC corrections results in a significant enhancement of the transresistivity and qualitative changes in its temperature dependence. In particular, the large high-temperature plasmon peak that is present in the random phase approximation is found to disappear when the XC corrections are included. Our numerical results at low temperatures are in good agreement with the results of recent experiments by Kellogg et al. ͓Solid State Commun. 123, 515 ͑2002͔͒.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Exchange and correlation effects on plasmon dispersions and Coulomb drag in low-density electron bilayers

et al. 2007

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“…These remarkable structures allow the experimentalist to probe directly the interlayer interactions by doing a ''simple'' transport measurement, i.e., turning on a current in one layer, and measuring the voltage built up in the second. [3][4][5][6][7][8][9] These experiments provide a unique opportunity for a transport measurement to study effects of interparticle interaction.…”

Section: Introductionmentioning

confidence: 99%

Optical-phonon-induced frictional drag in coupled two-dimensional electron gases

1998

Phys. Rev. B

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The role of optical phonons in frictional drag between two adjacent but electrically isolated two-dimensional electron gases is investigated. Since the optical phonons in III-V materials have a considerably larger coupling to electrons than acoustic phonons ͑which are the dominant drag mechanism at low T and large separations͒, it might be expected that the optical phonons will contribute a large effect at high temperatures. The two key differences between optical-and acoustic-phonon-mediated drag are ͑i͒ the optical-phonon-mediated interlayer interaction is short-ranged due to the negligible group velocity at the Brillouin zone center, and ͑ii͒ the typical momentum transfer for an optical-phonon-mediated scattering is relatively large. These considerations make optical-phonon-mediated drag difficult to see in single-subband GaAs systems, but it may be possible to see the effect in double-subband GaAs systems or single-subband quantum wells in a material with a lower effective mass and lower optical-phonon energy, such as InSb. ͓S0163-1829͑98͒05219-9͔

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“…The experiments of Hill et al [5] showed the evidence of plasmon enhancement to the drag resistivity at temperatures close to the Fermi temperature. They have also found significant differences with the random-phase approximation (RPA) based calculations [6] and the observed results.…”

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confidence: 95%

“…Ś wierkowski et al [9] applied the STLS formalism to double-layer electron -electron and electron-hole systems to demonstrate that the correlation effects enhance the drag resistivity by an order of magnitude compared to the RPA results. These calculations were compared with the experimental data of Gramila et al [5] which were at relatively high density, viz. n ¼ 1:5 £ 10 11 cm 22 .…”

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confidence: 99%

Many-body effects in the Coulomb drag between low density electron layers

Yurtsever

Moldoveanu

Tanatar

2003

Solid State Communications

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Recent Coulomb drag experiments in low-density double-layer electron systems have the power of distinguishing various many-body formulations of the effective interactions. In this work we theoretically study the correlation effects on the drag resistivity in these systems within various models. The effective inter-layer interactions are best described by the generalization to the double-layer case of the Kukkonen -Overhauser approach which differs significantly from the self-consistent field approach of Singwi et al. [Phys. Rev. 176 (1968) 589]. Following the formulation of Vignale and Singwi [Phys. Rev. B 32 (1985) 2156] we derive an expression for the effective inter-layer interaction which embodies the many-body correlations through the local-field corrections. The drag resistivity is calculated within this approach together with the Hubbard approximation for the intra-layer local-field factor and a simple model for the inter-layer correlations. Comparison with the recent measurements of Kellogg et al. [Solid State Commun. 123 (2002) 515] yields very good agreement. Our results are also contrasted with the corresponding drag resistivities given by the Singwi et al. theory, the dynamic random-phase approximation and the Hubbard approximation. The significant differences found between these theories emphasize the strong sensitivity of the drag resistivity to the effective inter-layer interactions. q

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Correlation Effects on the Coupled Plasmon Modes of a Double Quantum Well

Cited by 102 publications

References 21 publications

Exchange and correlation effects on plasmon dispersions and Coulomb drag in low-density electron bilayers

Exchange and correlation effects on plasmon dispersions and Coulomb drag in low-density electron bilayers

Optical-phonon-induced frictional drag in coupled two-dimensional electron gases

Many-body effects in the Coulomb drag between low density electron layers

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