Relaxation and Dephasing in a Two-Electron C13 Nanotube Double Quantum Dot

H. O. H. Churchill, F. Kuemmeth, J. W. Harlow, A. J. Bestwick, E. I. Rashba, K. Flensberg, C. H. Stwertka, T. Taychatanapat, S. K. Watson, and C. M. Marcus
Phys. Rev. Lett. 102, 166802 – Published 22 April 2009

Abstract

We use charge sensing of Pauli blockade (including spin and isospin) in a two-electron C13 nanotube double quantum dot to measure relaxation and dephasing times. The relaxation time T1 first decreases with a parallel magnetic field and then goes through a minimum in a field of 1.4 T. We attribute both results to the spin-orbit-modified electronic spectrum of carbon nanotubes, which at high field enhances relaxation due to bending-mode phonons. The inhomogeneous dephasing time T2* is consistent with previous data on hyperfine coupling strength in C13 nanotubes.

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  • Received 19 November 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.166802

©2009 American Physical Society

Authors & Affiliations

H. O. H. Churchill1, F. Kuemmeth1, J. W. Harlow1, A. J. Bestwick1, E. I. Rashba1,2, K. Flensberg3, C. H. Stwertka1, T. Taychatanapat1, S. K. Watson1,*, and C. M. Marcus1,†

  • 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
  • 2Center for Nanoscale Systems, Harvard University, Cambridge, Massachusetts 02138, USA
  • 3Nano-Science Center, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark

  • *Present address: Department of Physics, Middlebury College, Middlebury, VT 05753, USA.
  • marcus@harvard.edu

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Vol. 102, Iss. 16 — 24 April 2009

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