Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2000-08-18
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 3 figures, REVTeX. Revised version (shortened), accepted for publication in PRB
Scientific paper
10.1103/PhysRevB.63.245312
We model the 2-probe conductance of a quantum point contact (QPC), in linear response. If the QPC is highly non-adiabatic or near to scatterers in the open reservoir regions, then the usual distinction between leads and reservoirs breaks down and a technique based on scattering theory in the full two-dimensional half-plane is more appropriate. Therefore we relate conductance to the transmission cross section for incident plane waves. This is equivalent to the usual Landauer formula using a radial partial-wave basis. We derive the result that an arbitrarily small (tunneling) QPC can reach a p-wave channel conductance of 2e^2/h when coupled to a suitable reflector. If two or more resonances coincide the total conductance can even exceed this. This relates to recent mesoscopic experiments in open geometries. We also discuss reciprocity of conductance, and the possibility of its breakdown in a proposed QPC for atom waves.
Barnett Alex H.
Blaauboer Miriam
Heller Eric J.
Mody Areez
No associations
LandOfFree
Mesoscopic scattering in the half-plane: squeezing conductance through a small hole does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Mesoscopic scattering in the half-plane: squeezing conductance through a small hole, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mesoscopic scattering in the half-plane: squeezing conductance through a small hole will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-555264