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Zero effective electron g ‐factor of QD realized by optically induced nuclear field
Author(s) -
Sasakura H.,
Adachi S.,
Kaji R.,
Yamada K.,
Muto S.
Publication year - 2009
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.200880627
Subject(s) - zeeman effect , excitation , physics , quantum dot , electron , zero field splitting , atomic physics , field (mathematics) , condensed matter physics , exciton , magnetic field , quantum mechanics , spin polarization , mathematics , pure mathematics
We investigated an optically created nuclear field in a single InAlAs quantum dot and demonstrated that the zero effective electron g ‐factor could be achieved by the cancellation of the external magnetic field by the nuclear field at one edge of the nuclear polarization bistability. In addition, we discussed more practical way to realize the zero g ‐factor using the unique maximum value of the nuclear field, which keeps steady value against the fluctuation of excitation power. The cancellation for the electron Zeeman splitting provides the accurate hole g ‐factor. Since exciton g ‐factor is obtained by the Zeeman splitting without the nuclear field due to the linearly polarized excitation, we can evaluate the magnitudes and the signs of electron and hole g ‐factors in the growth direction of the single quantum dot. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)