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