Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 43: TR: Nanoelectronics II - Spintronics and Magnetotransport 2 (jointly with HL and MA)

TT 43.3: Vortrag

Mittwoch, 16. März 2011, 19:30–19:45, HSZ 03

Rectification effects in spin chains — •Kevin van Hoogdalem and Daniel Loss — Klingelbergstrasse 82, CH-4056 Basel, Switzerland

We study spin transport in non-itinerant one-dimensional quantum systems. Inspired by possible applications in spintronics, we consider rectification effects in both ferromagnetic (FM) and antiferromagnetic (AF) spin chains. We find that the crucial ingredients in designing a system that displays a non-zero rectification current are an anisotropy in the exchange interaction of the spin chain combined with an offset magnetic field. For both FM and AF systems we can exploit the gap in the excitation spectrum that is created by a bulk anisotropy to obtain a measureble rectification effect at realistic magnetic fields. For AF systems we also find we can achieve a similar effect by considering a specific sort of impurity, obtained by altering two neighboring bonds in the Heisenberg Hamiltonian.