PP 1386: Controlled Thermoelectric Properties of Low-Dimensional Charge Carrier Systems in Semiconductor Heterostructures (I)

The focus of this cluster project in the DFG priority programme 1386 "Nanostructured Thermoelectrics" is the thermoelectric properties of low-dimensional charge-carrier systems in high-quality semiconductor heterostructures. The project focuses on systems, in which the energy spectrum is controllable to a high extent via external parameters. They can be viewed as model systems for the engineering of nanoscale objects with tailored thermoelectric properties. Experiments will be performed on systems in quasi-one-dimensional electron wires and quantum point contacts in modulation doped III-V heterostructures which will be prepared by means of electron-beam lithography. Consequences of thermal gradients on coherent electron transport is studied for quantum rings by measurement of Aharonov-Bohm resistance oscillations. The electron temperature in the quasi-two-dimensional reservoirs is determined by noise measurements and the thermopower in quasi-one-dimensional wires is investigated.