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Semiconductor Ferromagnetism in Quantum Dot Array
Author(s) -
Tamura H.,
Shiraishi K.,
Takayanagi H.
Publication year - 2001
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/(sici)1521-3951(200104)224:3<723::aid-pssb723>3.0.co;2-p
Subject(s) - ferromagnetism , condensed matter physics , quantum dot , bipartite graph , physics , semiconductor , magnetic semiconductor , spin (aerodynamics) , electron , quantum mechanics , mathematics , graph , discrete mathematics , thermodynamics
Abstract Ferromagnetism is theoretically predicted in non‐magnetic semiconductor‐dot arrays. We propose two types of bipartite dot‐arrays which show flat‐band ferromagnetism according to the Lieb theorem. We verify spin‐polarized ground states at half‐filling by performing an exact diagonalization calculation. The ferromagnetic states can be freely switched on and off by changing the electron‐filling via the gate voltage.