Collective excitations in a magnetically doped quantized Hall ferromagnet

Details Collective excitations in a magnetically doped quantized Hall ferromagnet Collective excitations in a magnetically doped quantized Hall ferromagnet

2007-04-04

arxiv.org/abs/0704.0658v3

Phys. Rev. B 76, 205309 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

32 pages including 7 figures. To be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.76.205309

A theory of collective states in a magnetically quantized two-dimensional electron gas (2DEG) with half-filled Landau level (quantized Hall ferromagnet) in the presence of magnetic 3d impurities is developed. The spectrum of bound and delocalized spin-excitons as well as the renormalization of Zeeman splitting of the impurity 3d levels due to the indirect exchange interaction with the 2DEG are studied for the specific case of n-type GaAs doped with Mn where the Lande` g-factors of impurity and 2DEG have opposite signs. If the sign of the 2DEG g-factor is changed due to external influences, then impurity related transitions to new ground state phases, presenting various spin-flip and skyrmion-like textures, are possible. Conditions for existence of these phases are discussed. PACS: 73.43.Lp, 73.21.Fg, 72.15.Rn

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