Temperature-induced spin-coherence dissipation in quantum dots

2008/03/31 by F. G. G. Hernández, F. G. G. Hernandez, A. Greilich +8
Engineering · Physics and Astronomy · #Advancements in Semiconductor Devices and Circuit Design #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.mtrl-sci

paper · pdf · doi:10.1103/physrevb.78.041303

published as Phys. Rev. B 78, 041303(R) (2008) · 4 pages, 2 figures

arxiv created 2008/06/18 · openalex publication_date 2008/07/11 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The temperature dependence of electron-spin coherence in singly negatively charged (In,Ga)As/GaAs quantum dots is studied by time-resolved Faraday rotation. The decoherence time T₂ is constant on the microsecond scale for temperatures below 15 K; for higher temperatures it shows a surprisingly sharp drop into the nanosecond range. The decrease cannot be explained through inelastic scattering with phonons, and it may be related to elastic scattering due to phonon-mediated fluctuations of the hyperfine interaction.

Citations

• Spin relaxation and anticrossing in quantum dots: Rashba versus Dresselhaus spin-orbit coupling
• Quantum tunnelling in a dissipative system
• Coherent Manipulation of Coupled Electron Spins in Semiconductor Quantum Dots
• Stimulated and Spontaneous Optical Generation of Electron Spin Coherence in Charged GaAs Quantum Dots
• Single-shot read-out of an individual electron spin in a quantum dot