Volume 36, Number 9, December III 1996
|Page(s)||695 - 700|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Electron correlation and charge transfer instability in bilayered two-dimensional electron gas
Scuola Normale Superiore - Piazza dei Cavalieri,
I-56126 Pisa, Italy
2 Istituto Nazionale di Fisica della Materia,
3 Dipartimento di Fisica Teorica, Università di Trieste Strada Costiera 11, I-34014 Trieste, Italia
Accepted: 5 November 1996
We prove that the predicted charge transfer state in symmetric bilayers of two-dimensional electron gases is always unstable at zero bias voltage, due to interlayer interactions and/or tunneling. This is most easily seen by resorting to a pseudospin formalism and considering coherent states obtained from the charge transfer state through rotations of the pseudospins. Evidently, the charge transfer state is stabilized by a sufficiently strong gate voltage, as found in recent experiments. We show that a simple model, in which the layers are strictly two-dimensional, is able to account quantitatively for such experimental findings, when correlation is properly included.
PACS: 71.45.Gm – Exchange, correlation, dielectric and magnetic functions, plasmons / 73.40.Kp – III-V semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions
© EDP Sciences, 1996
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