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J. Phys. Soc. Jpn. 77 (2008) 031012 (9 pages)  |Previous Article| |Next Article|  |Table of Contents|
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SPECIAL TOPICS

Advances in Spintronics

Theory of Spin Qubits in Nanostructures

Björn Trauzettel1,2, Massoud Borhani1, Mircea Trif1, and Daniel Loss1

1Department of Physics and Astronomy, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
2Institute for Theoretical Physics and Astrophysics, University of Würzburg, D-97074 Würzburg, Germany

(Received July 31, 2007; Accepted December 17, 2007; Published March 10, 2008)

We review recent advances on the theory of spin qubits in nanostructures. We focus on four selected topics. First, we show how to form spin qubits in the new and promising material graphene. Afterwards, we discuss spin relaxation and decoherence in quantum dots. In particular, we demonstrate how charge fluctations in the surrounding environment cause spin decay via spin–orbit coupling. We then turn to a brief overview of how one can use electric dipole spin resonance (EDSR) to perform single spin rotations in quantum dots using an oscillating electric field. The final topic we cover is the spin–spin coupling via spin–orbit interaction which is an alternative to the usual spin–spin coupling via the Heisenberg exchange interaction. ©2008 The Physical Society of Japan

KEYWORDS: spin qubits, graphene, decoherence, EDSR, spin–spin coupling
URL: http://jpsj.ipap.jp/link?JPSJ/77/031012/
DOI: 10.1143/JPSJ.77.031012


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