2005/10/31 by Changxue Deng, Xuedong Hu
Chemistry · Engineering · Physics and Astronomy · #Advancements in Semiconductor Devices and Circuit Design #Atomic physics #Chemistry #Condensed matter physics #Electron #Hyperfine structure #Physics #Polarization (electrochemistry) #Quantum #Quantum and electron transport phenomena #Quantum decoherence #Quantum dot #Quantum electrodynamics #Quantum mechanics #Semiconductor Quantum Structures and Devices #Spin (aerodynamics) #Spin polarization #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.73.241303
published as Phys. Rev. B 73 241303(R) (2006) · 4 pages, 3 figures
openalex publication_date 2006/06/07 · arxiv created 2006/07/23 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We analytically solve the non-Markovian single-electron spin dynamics due to hyperfine interaction with surrounding nuclei in a quantum dot. We use the equation-of-motion method assisted with a large field expansion, and find that virtual nuclear spin flip-flops mediated by the electron contribute significantly to a complete decoherence of the transverse electron spin correlation function. Our results show that a 90% nuclear polarization can enhance the electron spin time T2 by almost two orders of magnitude. In the long time limit, the electron spin correlation function has a nonexponential 1∕t2 decay in the presence of both polarized and unpolarized nuclei.