Many-body correlations probed by plasmon-enhanced drag measurements in double-quantum-well structures

Noh, Hwayong; Zelakiewicz, S.; Feng, Xiang; Gramila, T. J.; Pfeiffer, L. N.; West, K. W.

doi:10.1103/physrevb.58.12621

Cited by 35 publications

(37 citation statements)

References 29 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: 89%

“…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: 89%

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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“…They have also found significant differences with the random-phase approximation (RPA) based calculations [6] and the observed results. Noh et al [7] performed similar experiments and argued that correlation induced multi-particle excitations must be included to account for the observed density dependences.…”

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confidence: 86%

“…Considering the hole-hole bilayer system [11] Hwang et al [12] used the Hubbard approximation to account for the correlation effects together with several additional arguments to explain the experimental results. The experiments of Kellogg et al [10] which were the starting point of our work have a two-fold importance: first the layers they used are separated by a distance (280 Å ) which is smaller than the ones reported in previous experiments [3,7] thus making the double-layer system more sensitive to interlayer interactions and second, one has k F d < 1 (d being the interlayer center to center separation), a regime where the 2k F electron -electron backward scattering cannot be neglected. Both inter-layer interactions and 2k F processes are expected to contribute to the drag resistivity and thus explain the discrepancies between the measured drag resistivity and the prediction given by a model [6] in which the static screening is given by a Thomas-Fermi approximation (which coincides with RPA only when q , 2k F ).…”

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confidence: 97%

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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“…The drag effect has been studied experimentally in a variety of setups in which the charge carriers in the quantum wells are electrons, holes, or one of each. [4][5][6][7][8][9] The theoretical efforts have concentrated on calculating the momentum transfer rate due to different mechanisms within many-body theory. [10][11][12][13][14][15] In this paper, we study the effects of disorder on the Coulomb drag rate in coupled quantum wells in the low temperature regime.…”

Section: Introductionmentioning

confidence: 99%

Self-consistent theory of localization and Coulomb drag effect

Tanatar

Das

2000

Phys. Rev. B

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We study the Coulomb drag rate for electrons in a double-quantum-well structure in the presence of disorder. The self-consistent theory of localization is used to obtain the frequency dependence of the generalized diffusion coefficient which influences the response functions. The interplay between screening effects and disorder at low temperature gives rise to an enhanced drag rate as the system goes from a weakly localized to a strongly localized phase with increasing disorder. The change in the interlayer momentum transfer rate may be used as a probe to investigate localization properties of coupled quantum-well systems.

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Many-body correlations probed by plasmon-enhanced drag measurements in double-quantum-well structures

Cited by 35 publications

References 29 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

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

Self-consistent theory of localization and Coulomb drag effect

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