Dresden 2009 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 19: Theory of electronic structure
HL 19.2: Vortrag
Dienstag, 24. März 2009, 12:45–13:00, BEY 81
Pseudospin Resonance in two Coaxial Tubes — •Benedikt Scharf1, Jaroslav Fabian2, and Alex Matos-Abiague3 — 1Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Deutschland — 2Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Deutschland — 3Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Deutschland
In a 2DEG confined to two coaxial tubes the 'tube degree of freedom' can be described in terms of pseudospin-1/2 dynamics. The presence of tunneling between the two tubes leads to a collective oscillation known as pseudospin resonance. We employ perturbation theory to examine the dependence of the dispersion of this mode on a coaxial magnetic field for the case of small intertube distances. Coulomb interactions lead to a shift in the resonance frequency. The presence of the coaxial magnetic field gives rise to pronounced peaks in the shift of the resonance frequency. For large magnetic fields this shift vanishes due to the effects of Zeeman splitting.