ar X iv : c on d - m at / 0 10 23 61 20 F eb 2 00 1 1 THEORY OF FERROMAGNETISM IN ( A , Mn ) B SEMICONDUCTORS
نویسندگان
چکیده
A brief review of theory of ferromagnetism of diluted magnetic semiconductors of the form (A, Mn) B based on the double exchange model is first given. A systematic investigation of the phenomena extending the current theory is outlined. We begin with an investigation of regions of instability of the nonmagnetic towards the ferromagnetic state of a system of Mn-atoms doped in AB-type semiconductor. A self-consistent many-body theory of the ferromagnetic state is then developed, going beyond the mean field approaches by including fluctuations of the Mn-spins and the itinerant hole-gas. A functional theory suitable for computation of system properties such as Curie temperature as a function of hole and the Mn-concentration, spin-current, etc. is formulated.
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