Temperature dependence of the ``0.7'' 2(e^2)/h quasi plateau in strongly confined quantum point contacts

Details Temperature dependence of the ``0.7'' 2(e^2)/h quasi plateau in strongly confined quantum point contacts Temperature dependence of the ``0.7'' 2(e^2)/h quasi plateau in strongly confined quantum point contacts

1998-07-20

arxiv.org/abs/cond-mat/9807277v1

Physica B 249-251, 180 (1998)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

RevTex (4 pages) including 2 postscript figures. To appear in Physica B, 1998

Scientific paper

10.1016/S0921-4526(98)00094-5

We present new results of the ``0.7'' 2(e^2)/h structure or quasi plateau in some of the most strongly confined point contacts so far reported. This strong confinement is obtained by a combination of shallow etching and metal gate deposition on modulation doped GaAs/GaAlAs heterostructures. The resulting subband separations are up to 20 meV, and as a consequence the quantized conductance can be followed at temperatures up to 30 K, an order of magnitude higher than in conventional split gate devices. We observe pronounced quasi plateaus at several of the lowest conductance steps all the way from their formation around 1 K to 30 K, where the entire conductance quantization is smeared out thermally. We study the deviation of the conductance from ideal integer quantization as a function of temperature, and we find an activated behavior, exp(-T_a/T), with a density dependent activation temperature T_a of the order of 2 K. We analyze our results in terms of a simple theoretical model involving scattering against plasmons in the constriction.

Affiliated with

Also associated with

No associations

Rating

Temperature dependence of the ``0.7'' 2(e^2)/h quasi plateau in strongly confined quantum point contacts 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 Temperature dependence of the ``0.7'' 2(e^2)/h quasi plateau in strongly confined quantum point contacts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Temperature dependence of the ``0.7'' 2(e^2)/h quasi plateau in strongly confined quantum point contacts will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-593082