A G Rojo 1999 J. Phys.: Condens. Matter 11 R31 doi:10.1088/0953-8984/11/5/004
A G Rojo
Show affiliationsThe advances in the techniques used for fabrication and lithography of semiconductors have made it possible to study bi-layer systems made of two electronic layers separated by distances of several hundred ångströms. In this situation the electrons in layer 1 are distinguishable from those in layer 2, and can communicate through the direct inter-layer Coulomb interaction. In particular, if a current is applied to one of the layers, the electrons in the second will be dragged, giving rise to a transresistance ρD. In this article we review recent theoretical and experimental developments in the understanding of this effect. At very low temperatures it turns out that phonons dominate the transresistance. The direct Coulomb interaction and plasmon excitations are important at temperatures T >0.1TF, with TF the Fermi temperature. If a magnetic field is applied, the transresistance is increased, in a very interesting interplay between ρD and Landau quantization. The non-dissipative drag is also reviewed.
71.45.Gm Exchange, correlation, dielectric and magnetic response functions, plasmons
Issue 5 (8 February 1999)
Received 1 May 1998, in final form 11 November 1998
A G Rojo 1999 J. Phys.: Condens. Matter 11 R31
Geoffrey W. Marcy et al 1998 ApJ 505 L147
C. Alcock et al. 1997 ApJ 486 697