Relaxation and Dephasing in a Two-electron 13C Nanotube Double Quantum Dot

Details Relaxation and Dephasing in a Two-electron 13C Nanotube Double Quantum Dot Relaxation and Dephasing in a Two-electron 13C Nanotube Double Quantum Dot

2008-11-19

arxiv.org/abs/0811.3239v1

Phys. Rev. Lett. 102, 166802 (2009).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

related papers at http://marcuslab.harvard.edu

Scientific paper

We use charge sensing of Pauli blockade (including spin and isospin) in a two-electron 13C nanotube double quantum dot to measure relaxation and dephasing times. The relaxation time, T1, first decreases with parallel magnetic field 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 suppresses hyperfine mediated relaxation and enhances relaxation due to soft phonons. The inhomogeneous dephasing time, T2*, is consistent with previous data on hyperfine coupling strength in 13C nanotubes.

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