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Sub‐second electron spin lifetimes in quantum dots at zero applied magnetic field due to alignment of QD nuclei
Author(s) -
Oulton R.,
Verbin S. Yu.,
Auer T.,
Cherbunin R. V.,
Greilich A.,
Yakovlev D. R.,
Bayer M.,
Reuter D.,
Wieck A.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200671529
Subject(s) - quantum dot , electron , hyperfine structure , magnetic field , spin polarization , physics , spin (aerodynamics) , zero field splitting , condensed matter physics , polarization (electrochemistry) , atomic physics , chemistry , optoelectronics , quantum mechanics , thermodynamics
A key to ultra‐long electron spin memory in quantum dots (QDs) at zero magnetic field is polarization of the nuclei, such that the electron spin is stabilized along the nuclear magnetic field. We demonstrate that spin‐polarized electrons in n‐doped QDs align the nuclear field via hyperfine interaction. A feedback onto the electrons occurs, leading to stabilization of polarization, for which spin memory is retained over 0.2 seconds. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)