Para-ortho transition of artificial H$_2$ molecule in lateral quantum dots doped with magnetic impurities

Details Para-ortho transition of artificial H$_2$ molecule in lateral quantum dots doped with magnetic impurities Para-ortho transition of artificial H$_2$ molecule in lateral quantum dots doped with magnetic impurities

2009-07-27

arxiv.org/abs/0907.4726v2

Phys. Rev. B 80, 165332 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

We present the magnetic phase diagram of artificial H$_2$ 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.

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