Spin polarons in triangular antiferromagnets

Details Spin polarons in triangular antiferromagnets Spin polarons in triangular antiferromagnets

1998-11-13

arxiv.org/abs/cond-mat/9811191v1

Phys. Rev. B 59, 6027 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 6 figs, to be publish in PRB

Scientific paper

10.1103/PhysRevB.59.6027

The motion of a single hole in a 2D triangular antiferromagnet is investigated using the t-J model. The one-hole states are described by strings of spin deviations around the hole. Using projection technique the one-hole spectral function is calculated. For large J/t we find low-lying quasiparticle-like bands which are well separated from an incoherent background by a gap of order J. However, for small J/t this gap vanishes and the spectrum becomes broad over an energy range of several t. The results are compared with SCBA calculations and numerical data.

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