Regensburg 2010 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

HL: Fachverband Halbleiterphysik

HL 61: Poster II: Materials, Interfaces and Heterostructures

HL 61.37: Poster

Thursday, March 25, 2010, 18:00–20:00, Poster D1

Thermoelectric measurements on suspended 2DES — •Matthias Schmidt, Andrea Stemmann, and Wolfgang Hansen — Institut für Angewandte Physik, Universität Hamburg, Germany

Low-temperature magnetothermoelectric properties of free-standing two-dimensional electron systems are studied. A suspended lamella containing a 2DES is prepared from GaAs/AlGaAs heterostructures grown by molecular beam epitaxy. Electron-beam lithography is used to structure a micro Hall bar, evaporated AuGe contact leads, micro-scaled thermometers and a Joule heater on top of the thin, free-standing lamella. The lamella is attached to cold reservoirs. A thermal gradient along the lamella is generated by a heating current in the central region. We present first measurements on the heat conductivity, the thermal gradient and the magnetothermopower along the free-standing lamella.