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Spin-Orbit-Induced Strong Coupling of a Single Spin to a Nanomechanical Resonator

András Pályi, P. R. Struck, Mark Rudner, Karsten Flensberg, and Guido Burkard
Phys. Rev. Lett. 108, 206811 – Published 18 May 2012
Physics logo See Focus story: Electron Spin Influences Nanotube Motion
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Abstract

We theoretically investigate the deflection-induced coupling of an electron spin to vibrational motion due to spin-orbit coupling in suspended carbon nanotube quantum dots. Our estimates indicate that, with current capabilities, a quantum dot with an odd number of electrons can serve as a realization of the Jaynes-Cummings model of quantum electrodynamics in the strong-coupling regime. A quantized flexural mode of the suspended tube plays the role of the optical mode and we identify two distinct two-level subspaces, at small and large magnetic field, which can be used as qubits in this setup. The strong intrinsic spin-mechanical coupling allows for detection, as well as manipulation of the spin qubit, and may yield enhanced performance of nanotubes in sensing applications.

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  • Received 24 October 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.206811

© 2012 American Physical Society

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Electron Spin Influences Nanotube Motion

Published 18 May 2012

The oscillations of a carbon nanotube can strongly affect the spin of an electron trapped on the tube, and the tube can also be affected by the spin, according to theory.

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Authors & Affiliations

András Pályi1,2, P. R. Struck1, Mark Rudner3, Karsten Flensberg3,4, and Guido Burkard1

  • 1Department of Physics, University of Konstanz, D-78457 Konstanz, Germany
  • 2Department of Materials Physics, Eötvös University, H-1517 Budapest POB 32, Hungary
  • 3Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
  • 4Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark

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Issue

Vol. 108, Iss. 20 — 18 May 2012

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