Evidence for virtual-phonon exchange in semiconductor heterostructures

Gramila, T. J.; Eisenstein, J. P.; MacDonald, Allan H.; Pfeiffer, L. N.; West, K. W.

doi:10.1103/physrevb.47.12957

Cited by 165 publications

(165 citation statements)

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“…[11][12][13][14][15][16][17] However, the phonon-mediated drag provides a dominant mechanism only in samples with large interlayer spacing where the absolute value of the measured drag rate is much smaller than that observed in these experiments. Moreover, the phonon mechanism is not supported by the measured density-ratio dependence of drag, which shows no peak at matched carrier densities in two layers, typical for that processes.…”

Section: Introductionmentioning

confidence: 46%

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: 46%

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

et al. 2007

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“…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 ).…”

mentioning

confidence: 95%

“…In the previous drag experiments [3,4] on electronelectron double-layer systems the density parameter was of the order of r s , 1 -2; justifying the use of the RPA for theoretical modeling. The recent experiments of Kellogg et al [10] on the other hand, are in the range of r s , 2 -4 which are somewhat outside the area of applicability of RPA.…”

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confidence: 99%

“…Starting with the pioneering work of Gramila et al [3] there has been a number of experimental investigations of the drag effect probing the various regimes of the parameter space of layer densities, temperature, and separation distance between the quantum wells [4]. The experiments of Hill et al [5] showed the evidence of plasmon enhancement to the drag resistivity at temperatures close to the Fermi temperature.…”

mentioning

confidence: 99%

“…Another useful information we draw from these plots is that the density dependence of r D is essentially similar for dynamic RPA, STLS, and the present model. They all roughly follow the n 24 rule, in contrast to the prediction of n 23 of the simple model [3,6].…”

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confidence: 99%

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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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Long‐Range Non‐Coulombic Electron–Electron Interactions between LaAlO₃/SrTiO₃ Nanowires

Tang

Tylan‐Tyler

Lee

et al. 2019

Adv Materials Inter

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The LaAlO3/SrTiO3 system exhibits unusual magnetic and superconducting behavior arising from electron–electron interactions whose physical origin is not well understood. Quantum transport techniques, especially those involving mesoscopic geometries, can offer insight into these interactions. Here evidence for long‐range electron–electron interactions in LaAlO3/SrTiO3 nanowires, measured through the phenomenon of frictional drag, is reported, in which current passing through one nanowire induces a voltage across a nearby electrically isolated nanowire. Frictional drag mediated by the Coulomb interaction is predicted to decay exponentially with interwire separation, but with the LaAlO3/SrTiO3 nanowire system it is found to be nearly independent of separation. Frictional drag experiments performed with three parallel wires demonstrate long‐range frictional coupling even in the presence of an electrically grounded central wire. Collectively, these results provide evidence for a new long‐range non‐Coulombic electron–electron interaction unlike anything previously reported for semiconducting systems.

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Evidence for virtual-phonon exchange in semiconductor heterostructures

Cited by 165 publications

References 17 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

Long‐Range Non‐Coulombic Electron–Electron Interactions between LaAlO₃/SrTiO₃ Nanowires

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Evidence for virtual-phonon exchange in semiconductor heterostructures

Cited by 165 publications

References 17 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

Long‐Range Non‐Coulombic Electron–Electron Interactions between LaAlO3/SrTiO3 Nanowires

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Product

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Long‐Range Non‐Coulombic Electron–Electron Interactions between LaAlO₃/SrTiO₃ Nanowires