Phys. Rev. B 80, 165332 (2009) [5 pages]Para-ortho transition of artificial H2 molecule in lateral quantum dots doped with magnetic impuritiesReceived 25 September 2009; published 27 October 2009 We present the magnetic phase diagram of artificial H2 molecule in lateral quantum dots doped with magnetic impurities as a function of external magnetic field and plunger gate voltage. The onset of Mn-Mn antiferromagnetic-ferromagnetic transition follows the electron spin singlet-triplet transition. We deploy a configuration-interaction method to exactly diagonalize the electron-Mn Hamiltonian and map it to an effective Mn-Mn Heisenberg Hamiltonian. We find that Mn-Mn exchange coupling can be described by RKKY-interaction/magnetic-polaron in weak/strong electron-Mn coupling at low/high magnetic fields. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.80.165332
DOI:
10.1103/PhysRevB.80.165332
PACS:
73.43.Lp, 73.63.Kv, 75.50.Gg
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