Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 21: Transport: Nanoelectronics II - Spintronics and Magnetotransport - Part 2

TT 21.3: Vortrag

Dienstag, 28. März 2006, 16:45–17:00, HSZ 105

Signature of spin-related phases in transport through regular polygones — •Dario Bercioux¹, Diego Frustaglia², and Michele Governale³ — ¹Institut für Theoretische Physik, Universität Regensburg, Germany — ²NEST-INFM & Scuola Normale Superiore, Pisa, Italy — ³Institut für Theoretische Physik III, Ruhr-Universität Bochum, Germany

We address the subject of transport in one-dimensional ballistic polygon loops subject to spin-orbit interactions. The polygons are modeled in the framework of the spin quantum-network technique [1]. We identify the role played by the polygon vertices in the accumulation of spin-related phases by studying interference effects as a function of the spin-orbit interaction strength. We find that the vertices act as strong spin-scattering centers that hinder the developing of Aharovov-Casher and Berry phases. In particular, we show that the oscillation frequency of interference pattern can be doubled by modifying the shape of the loop from a square to a circle [2].

[1] D. Bercioux et al., Phys. Rev. Lett. 93, 56802 (2004).

[2] D. Bercioux, D. Frustaglia, and M. Governale, Phys. Rev. B 72, 113310 (2005).