Effective Interaction Hamiltonian of Polaron Pairs in Diluted Magnetic Semiconductors
D. E. Angelescu, R. N. Bhatt
Abstract
The magnetic interaction of a pair of bound magnetic polarons (BMP) in diluted magnetic semiconductors (DMS) 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.
Create a lesson
Related papers
Finite-element reconstruction of molten-zone dynamics and chemical segregation in optical floating-zone grown Ni--Mn--Ga
Denys Musiienko, Taras Kovaliuk, Petr Harcuba et al.
The polar discontinuity picture in nickelate superlattices: comparison of the insulating and metallic phases
Edith Simmen, Jonathan Amara, Philippe Ghosez et al.
Ferroelectric control of magnetic coupling in a Cr dimer adsorbed on α-In2Se3
J. F. Ospina, S. Di Napoli, M. A. Barral
Heat Transport Mechanisms in MOF-5
Zezhu Zeng, Xia Liang, Hengtai Zheng et al.
Zero-Point Renormalization Reshapes the Shift Current: The Role of Electron-Phonon Coupling
Yang Li, Zuzhang Lin, Zhikuan Wang et al.
Half-integer quantum anomalous Hall effect in MnBi2Te4 via non-magnetic extension
Igor P. Rusinov, Tatiana V. Menshchikova, Evgueni V. Chulkov