Eur. Phys. J. B 36, 593-598 (2003)
https://doi.org/10.1140/epjb/e2004-00009-1

Ferromagnetism in diluted magnetic semiconductor quantum dot arrays embedded in semiconductors

¹ Department of Physics and Center for Theoretical Physics, Jilin University, Changchun 130023, P.R. China
² Department of Physics and Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, Korea

Corresponding author: ^a pin@jlu.edu.cn

Received: January 1900
Published online: 30 January 2004

Abstract

We present an Anderson-type model Hamiltonian with exchange coupling between the localized spins and the confined holes in the quantum dots to study the ferromagnetism in diluted magnetic semiconductor (DMS) quantum dot arrays embedded in semiconductors. The hybridization between the quantum-confined holes in the quantum dots and the itinerant holes in the semiconductor valence band makes possible hole transfer between the DMS quantum dots, which can induce the long range ferromagnetic order of the localized spins. In addition, it makes the carrier spins both in the quantum dots and in the semiconductors polarized. The spontaneous magnetization of the localized spins and the spin polarization of the holes are calculated using both the Weiss mean field approximation and the self-consistent spin wave approximation, which are developed for the present model.