Spin-orbit interaction and anomalous spin relaxation in carbon nanotube quantum dots

Denis V. Bulaev, Björn Trauzettel, and Daniel Loss
Phys. Rev. B 77, 235301 – Published 3 June 2008

Abstract

We study spin relaxation and decoherence in nanotube quantum dots caused by electron-lattice and spin-orbit interaction and predict striking effects induced by magnetic fields B. For particular values of B, destructive interference occurs resulting in ultralong spin relaxation times T1 exceeding tens of seconds. For small phonon frequencies ω, we find a 1/ω spin-phonon noise spectrum—a dissipation channel for spins in quantum dots—which can reduce T1 by many orders of magnitude. We show that nanotubes exhibit zero-field level splitting caused by spin-orbit interaction. This enables an all-electrical and phase-coherent control of spin.

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  • Received 21 January 2008

DOI:https://doi.org/10.1103/PhysRevB.77.235301

©2008 American Physical Society

Authors & Affiliations

Denis V. Bulaev1, Björn Trauzettel1,2, and Daniel Loss1

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

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Issue

Vol. 77, Iss. 23 — 15 June 2008

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