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

H O H Churchill; Ferdinand Kuemmeth; J W Harlow; A J Bestwick; E I Rashba; K Flensberg; C H Stwertka; T Taychatanapat; S K Watson; C M Marcus

doi:10.1103/PhysRevLett.102.166802

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

H O H Churchill, Ferdinand Kuemmeth, J W Harlow, A J Bestwick, E I Rashba, K Flensberg, C H Stwertka, T Taychatanapat, S K Watson, C M Marcus

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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 T2* is consistent with previous data on hyperfine coupling strength in 13C nanotubes.

Original language	English
Journal	Physical Review Letters
Volume	102
Issue number	16
Pages (from-to)	166802
Number of pages	4
ISSN	0031-9007
DOIs	https://doi.org/10.1103/PhysRevLett.102.166802
Publication status	Published - 22 Apr 2009

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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 T2* is consistent with previous data on hyperfine coupling strength in 13C nanotubes.",

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T1 - Relaxation and Dephasing in a Two-Electron 13C Nanotube Double Quantum Dot

AU - Churchill, H O H

AU - Kuemmeth, Ferdinand

AU - Harlow, J W

AU - Bestwick, A J

AU - Rashba, E I

AU - Flensberg, K

AU - Stwertka, C H

AU - Taychatanapat, T

AU - Watson, S K

AU - Marcus, C M

PY - 2009/4/22

Y1 - 2009/4/22

N2 - 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 T2* is consistent with previous data on hyperfine coupling strength in 13C nanotubes.

AB - 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 T2* is consistent with previous data on hyperfine coupling strength in 13C nanotubes.

U2 - 10.1103/PhysRevLett.102.166802

DO - 10.1103/PhysRevLett.102.166802

M3 - Journal article

SN - 0031-9007

VL - 102

SP - 166802

JO - Physical Review Letters

JF - Physical Review Letters

IS - 16

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