Abstract
We present a simpler derivation of the exact solution of a spin polaron in a ferromagnet and generalize it to complex lattices and/or longer-range exchange interactions. As a specific example, we analyze a two-dimensional -like lattice (as in the ferromagnetic layers in ) and discuss the properties of the resulting spin polaron in various regimes. At strong couplings the solution is reminiscent of the Zhang-Rice singlet, however the electronic wave function involved in the singlet is dependent on the momentum of the singlet, and multiple bands may appear.
- Received 15 April 2009
DOI:https://doi.org/10.1103/PhysRevB.79.195116
©2009 American Physical Society