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Published on: October 13, 2017
Relaxation and dephasing in a two-electron 13C nanotube double quantum dot
H O H Churchill1, F Kuemmeth, J W Harlow
1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Abstract:
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 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 T{2} is consistent with previous data on hyperfine coupling strength in 13C nanotubes.
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