Effective interaction Hamiltonian of polaron pairs in diluted magnetic semiconductors

被引：32
作者：
Angelescu, DE [1 ]
Bhatt, RN [1 ]
机构：
[1] Princeton Univ, Dept Phys & Elect Engn, Princeton, NJ 08544 USA
来源：
PHYSICAL REVIEW B | 2002年 / 65卷 / 07期
关键词：
D O I：
10.1103/PhysRevB.65.075211
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The magnetic interaction of a pair of bound magnetic polarons in diluted magnetic semiconductors is analyzed via a generalized Hubbard-type Hamiltonian for two carriers in the presence of effective magnetic fields arising from the magnetic polarization of their respective polarons. For the case where the magnetic fields at the two sites have equal magnitude but are allowed to have arbitrary directions, it is shown that the energy of the two polarons is minimized for a ferromagnetic configuration of the carrier spins (in contrast to the case of hydrogenic centers in nonmagnetic semiconductors) if polaron fields are strong enough. A modified Heisenberg-type Hamiltonian is constructed to describe the low energy states of the resulting system.
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页码：1 / 8
页数：8
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