Electron-electron scattering between closely spaced two-dimensional electron gases
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Electron-electron scattering between closely spaced two-dimensional electron gases. / Hill, N. P.R.; Nicholls, J. T.; Linfield, E. H.; Pepper, M.; Ritchie, D. A.; Hu, Ben Yu Kuang; Flensberg, Karsten.
In: Physica B: Condensed Matter, Vol. 249-251, 17.06.1998, p. 868-872.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Electron-electron scattering between closely spaced two-dimensional electron gases
AU - Hill, N. P.R.
AU - Nicholls, J. T.
AU - Linfield, E. H.
AU - Pepper, M.
AU - Ritchie, D. A.
AU - Hu, Ben Yu Kuang
AU - Flensberg, Karsten
PY - 1998/6/17
Y1 - 1998/6/17
N2 - Electron-electron interactions between two closely spaced electron gases can be directly measured by the drag voltage induced in one layer when a current is driven through the other. We have used such drag measurements of GaAs/AlGaAs double quantum wells to probe both the electronic excitations within each layer and the interlayer Coulomb interaction. Two contrasting regimes have been explored. First, at high temperatures we measure an enhanced drag due to the "antiscreening" of the coupled plasmon modes - a result which is in good agreement with theoretical predictions. Moreover, we show the importance of many-body corrections to the plasmon modes, enabling us to test a local-field description of the correlations. Second, drag measurements in the quantum Hall regime show more pronounced structure than the Shubnikov-de Haas oscillations; the drag is more sensitive to spin splitting at high filling factors and enhances the features seen at low filling factors. We show that the localised states away from the Landau level centre influence the drag.
AB - Electron-electron interactions between two closely spaced electron gases can be directly measured by the drag voltage induced in one layer when a current is driven through the other. We have used such drag measurements of GaAs/AlGaAs double quantum wells to probe both the electronic excitations within each layer and the interlayer Coulomb interaction. Two contrasting regimes have been explored. First, at high temperatures we measure an enhanced drag due to the "antiscreening" of the coupled plasmon modes - a result which is in good agreement with theoretical predictions. Moreover, we show the importance of many-body corrections to the plasmon modes, enabling us to test a local-field description of the correlations. Second, drag measurements in the quantum Hall regime show more pronounced structure than the Shubnikov-de Haas oscillations; the drag is more sensitive to spin splitting at high filling factors and enhances the features seen at low filling factors. We show that the localised states away from the Landau level centre influence the drag.
KW - Frictional drag
UR - http://www.scopus.com/inward/record.url?scp=0032089578&partnerID=8YFLogxK
U2 - 10.1016/S0921-4526(98)00338-X
DO - 10.1016/S0921-4526(98)00338-X
M3 - Journal article
AN - SCOPUS:0032089578
VL - 249-251
SP - 868
EP - 872
JO - Physica B: Physics of Condensed Matter & C: Atomic, Molecular and Plasma Physics, Optics
JF - Physica B: Physics of Condensed Matter & C: Atomic, Molecular and Plasma Physics, Optics
SN - 0921-4526
ER -
ID: 199597565