Binding of a mobile hole by an impurity potential in the t-J model: parity breaking

Details Binding of a mobile hole by an impurity potential in the t-J model: parity breaking Binding of a mobile hole by an impurity potential in the t-J model: parity breaking

2009-08-27

arxiv.org/abs/0908.3939v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

We revisit the problem of a single hole moving in the background of the two dimensional Heisenberg antiferromagnet. The hole is loosely bound by an impurity potential. We show that the bound state is generically a parity doublet: there are parametrically close bound states of opposite parity. Due to the degeneracy the bound state readily breaks local symmetries of the square lattice and this leads to formation of the long range spiral distortion of the antiferromagnetic background. A direct analogy with van der Waals forces in atomic physics is discussed.

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