Electrical Control of Spin Relaxation in a Quantum Dot

2007/07/11 by Sami Amasha, S. Amasha, K. MacLean +9 · 242 citations
Engineering · Physics and Astronomy · #Advancements in Semiconductor Devices and Circuit Design #Condensed matter physics #Physics #Quantum and electron transport phenomena #Quantum dot #Quantum mechanics #Relaxation (psychology) #Semiconductor Quantum Structures and Devices #Spin (aerodynamics) #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevlett.100.046803

published in Physical Review Letters 100(4), 046803 (American Physical Society) · 4 pages, 3 figures

arxiv created 2007/07/11 · openalex publication_date 2008/01/30 · arxiv updated 2010/09/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We demonstrate electrical control of the spin relaxation time T1 between Zeeman-split spin states of a single electron in a lateral quantum dot. We find that relaxation is mediated by the spin-orbit interaction, and by manipulating the orbital states of the dot using gate voltages we vary the relaxation rate W identical withT1(-1) by over an order of magnitude. The dependence of W on orbital confinement agrees with theoretical predictions, and from these data we extract the spin-orbit length. We also measure the dependence of W on the magnetic field and demonstrate that spin-orbit mediated coupling to phonons is the dominant relaxation mechanism down to 1 T, where T1 exceeds 1 s.

Citations

• Quantum measurement of a mesoscopic spin ensemble
• Allowed and forbidden transitions in artificial hydrogen and helium atoms
• Anisotropy of Spin Splitting and Spin Relaxation in Lateral Quantum Dots
• The production of aspect marker in Cantonese-speaking children an experimental study
• Geometrical Spin Dephasing in Quantum Dots
• Theory of Phonon-Induced Spin Relaxation in Laterally Coupled Quantum Dots
• Driven coherent oscillations of a single electron spin in a quantum dot
• Coherent Manipulation of Coupled Electron Spins in Semiconductor Quantum Dots
• Zeeman Energy and Spin Relaxation in a One-Electron Quantum Dot
• Spins in few-electron quantum dots
• Control and Detection of Singlet-Triplet Mixing in a Random Nuclear Field
• Single-shot read-out of an individual electron spin in a quantum dot

Cited by

• Acoustic phonons, spin-phonon coupling and spin relaxation via the lattice reorientation mechanism in hexagonal germanium nanowires
• Measurement of the Spin Relaxation Time of Single Electrons in a Silicon Metal-Oxide-Semiconductor-Based Quantum Dot