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- W2034173090 abstract "Abstract The coupling between systems of two spatially separated two-dimensional (2D) electron gases and between systems of a separated 2D electron gas and a 2D hole gas is studied as a function of magnetic field B . The small barrier (30 nm) separated coupled electron gases showed a transition from a phonon dominated interaction at B =0 to a Coulomb dominated one at quantising fields. For large barriers (190 nm) phonons have been found to be the dominant coupling mechanism both at zero and finite fields. However, for all barriers investigated we could observe novel screening effects manifested in a suppression of the coupling at half-filled Landau levels. For the coupled electron–hole gases we have investigated samples with large barriers (>190nm) so that the coupling is both in zero and finite fields dominated by phonon mediated processes. The enhanced screening effects could not be observed in those samples possibly due to the less pronounced quantisation of the hole gas." @default.
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- W2034173090 date "1997-01-01" @default.
- W2034173090 modified "2023-09-27" @default.
- W2034173090 title "Magnetic field studies of the frictional drag between coupled two-dimensional electronic systems – Coulomb versus phonon coupling" @default.
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- W2034173090 doi "https://doi.org/10.1016/s1386-9477(97)00035-0" @default.
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