Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 2: Transport: Nanoelectronics I - Quantum Dots and Wires, Point Contacts 1

TT 2.8: Vortrag

Montag, 23. März 2009, 12:15–12:30, HSZ 301

Weak localization in a two-dimensional hole gas — •Viktor Krückl, Michael Wimmer, Inanc Adagideli, and Klaus Richter — Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg

In several experiments the effect of weak localization is studied in two-dimensional hole gases but there are only few theoretical works which analyze the effects of the different hole types in a typical valence band structure. We investigate different materials modeled by the 4-band Luttinger Hamiltonian in a two-dimensional approximation. Transport properties in the diffusive regime as well as ballistic cavities are calculated in an effective tight-binding approximation by means of the Green function method. The influence of coupling between heavy holes and light holes leads to a decrease of the weak localization which is explained by the Berry curvature as well as a semiclassical description.