Équipe de Recherche en Physique de l'Information Quantique


Abstract = {We investigate the mechanism by which annealed Ni-Au-Ge metallizations establish electrical contact to the two-dimensional electron gas (2DEG) in AlGaAs/GaAs heterostructures and we assess the suitability of this contact process for defining patterned contacts in semi-conductor nanostructures. We present a picture where electrons are injected from an array of spikes which extend below the surface-metal pattern to penetrate the 2DEG and the associated quantum waves determine the contact resistance through phase-coherent interference processes at low temperatures. To probe this mesoscopic current injection process, we induce an evolution between two distinct geometries traditionally used to characterize semiconductor systems - the Corbino disc and the Hall bar. We also discuss refinements to the injection process which will facilitate the incorporation of shaped ohmic contacts into future nanostructure designs. {\copyright} 1998 Academic Press.},
Author = {Taylor, R.P. and Newbury, R. and Sachrajda, A.S. and Feng, Y. and Coleridge, P.T. and Davies, M. and McCaffrey, J.P.},
Document_Type = {Article},
Journal = {Superlattices and Microstructures},
Number = {5},
Pages = {337-345},
Source = {Scopus},
Title = {Investigation of the current injection properties of ohmic spikes in nanostructures},
Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0032303478&partnerID=40&md5=ceee955c04bada57345663198a7ffcb9},
Volume = {24},
Year = {1998},
Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0032303478&partnerID=40&md5=ceee955c04bada57345663198a7ffcb9}}