WAVE-FUNCTION AND SIZE OF SPIN-POLARONS IN THE T-J MODEL

Authors
Citation
A. Ramsak et P. Horsch, WAVE-FUNCTION AND SIZE OF SPIN-POLARONS IN THE T-J MODEL, Physica. C, Superconductivity, 282, 1997, pp. 1805-1806
Citations number
7
Categorie Soggetti
Physics, Applied
ISSN journal
09214534
Volume
282
Year of publication
1997
Part
3
Pages
1805 - 1806
Database
ISI
SICI code
0921-4534(1997)282:<1805:WASOSI>2.0.ZU;2-E
Abstract
Here we present a more detailed picture of some spatial properties of the spin-polaron - quasiparticle formed after injecting a hole into a planar quantum antiferromagnet. The explicit form of the quasiparticle wave function allows us accurately to investigate the spatial extent of the polaron. In the Ising limit of the model we find for the RMS ra dius of the distribution of spin-deviations around the moving hole is R = 1.06(t/J)(0.157). The form and the size of the polaron in the usua l t-J model (Heisenberg limit), is on the other hand, anisotropic, lar ger and does not obey such a simple scaling. Finally we discuss the re normalization of spin-polarons by phonons in the framework of a Holste in t-J model.