Thermopower of a 2D electron gas in suspended AlGaAs/GaAs heterostructures

Details Thermopower of a 2D electron gas in suspended AlGaAs/GaAs heterostructures Thermopower of a 2D electron gas in suspended AlGaAs/GaAs heterostructures

2011-11-05

arxiv.org/abs/1111.1303v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages

Scientific paper

We present thermopower measurements on a high electron mobility two-dimensional electron gas (2DEG) in a thin suspended membrane.We show that the small dimension of the membrane substantially reduces the thermal conductivity compared to bulk material so that it is possible to establish a strong thermal gradient along the 2DEG even at a distance of few micrometers. We find that the zero-field thermopower is significantly affected by the micro patterning. In contrast to 2DEGs incorporated in a bulk material, the diffusion contribution to the thermopower stays dominant up to a temperature of 7 K until the phonon-drag becomes strong and governs the run of the thermopower. We also find that the coupling between electrons and phonons in the phonon-drag regime is due to screened deformation potentials, in contrast to piezoelectric coupling found with bulk phonons.

Affiliated with

Also associated with

No associations

Rating

Thermopower of a 2D electron gas in suspended AlGaAs/GaAs heterostructures 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 Thermopower of a 2D electron gas in suspended AlGaAs/GaAs heterostructures, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermopower of a 2D electron gas in suspended AlGaAs/GaAs heterostructures will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-65362