Spin tunneling, Berry phases, and doped antiferromagnets
Abstract
Interference effects between Berryphase factors in spintunneling systems have been discussed by several groups in the context of quantum magnets. I point out that similar effects appear in the semiclassical analysis of the twodimensional doped antiferromagnet. As a consequence, the sign of the dispersion of a spin polaron in the tJ model depends on the spin size s in e^{i2πs}. Thus we arrive at a semiclassical interpretation of the groundstate momentum for the single hole. It agrees with numerical diagonalizations of the tJ model for s=1/2, and predicts a difference between integer and halfoddintegerspin cases.
 Publication:

Physical Review B
 Pub Date:
 August 1993
 DOI:
 10.1103/PhysRevB.48.3287
 arXiv:
 arXiv:condmat/9212018
 Bibcode:
 1993PhRvB..48.3287A
 Keywords:

 75.10.Jm;
 Quantized spin models;
 Condensed Matter
 EPrint:
 5 pages, LaTex