Berlin 2008 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 46: Transport in high magnetic field/quantum-Hall-effect

HL 46.4: Vortrag

Donnerstag, 28. Februar 2008, 12:30–12:45, EW 202

Topological Hall Effect studied in simple models — •Georgo Metalidis¹ and Patrick Bruno² — ¹Institut für Theoretische Festkörperphysik, Universität Karlsruhe, D-76128 Karlsruhe — ²Max-Planck-Institut für Mikrostrukturphysik, D-06120 Halle

Recently, a contribution to the Hall effect in ferromagnets has been found that is induced by the Berry phase, and does not involve a magnetic flux nor spin-orbit coupling. We have investigated this effect in a two-dimensional electron gas subject to a simple magnetic texture. Both the adiabatic regime, where the electron spin follows the magnetic texture exactly, and its nonadiabatic counterpart are studied, including the effect of disorder. In doing so, an ongoing discussion about the correct adiabaticity criterion in the diffusive limit is clarified.