Two-hole bound states in modified t-J model
M. Yu. Kuchiev, O. P. Sushkov
Abstract
We consider modified t-J model with minimum of single-hole dispersion at the points (0, π), ( π,0). It is shown that two holes on antiferromagnetic background produce a bound state which properties strongly differs from the states known in the unmodified t-J model. The bound state is d-wave, it has four nodes on the face of the magnetic Brillouin zone. However, in the coordinate representation it looks like as usual s-wave.
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