Relaxation and dephasing in a two-electron 13C nanotube double quantum dot.
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.
Churchill
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HO
Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Kuemmeth
F
F
Harlow
J W
JW
Bestwick
A J
AJ
Rashba
E I
EI
Flensberg
K
K
Stwertka
C H
CH
Taychatanapat
T
T
Watson
S K
SK
Marcus
C M
CM