Studies of one- and two-hole states in the 2D t-J model via series expansions

Details Studies of one- and two-hole states in the 2D t-J model via series expansions Studies of one- and two-hole states in the 2D t-J model via series expansions

1998-06-30

arxiv.org/abs/cond-mat/9806367v2

Physical Review B58, 15508(1998)

Physics

Condensed Matter

Strongly Correlated Electrons

19 pages, 12 figures

Scientific paper

10.1103/PhysRevB.58.15508

We study one and two hole properties of the t-J model at half-filling on the square lattice using series expansion methods at T=0. The dispersion curve for one hole excitations is calculated and found to be qualitatively similar to that obtained by other methods, but the bandwidth for small $t/J$ is some 20% larger than given previously. We also obtain the binding energy and dispersion relation for two hole bound states. The lowest bound state as $t/J$ increases is found to be first d-wave, and then p-wave, in accordance with predictions based upon the Kohn-Luttinger effect. We also make a similar study for the $t-J_z$ model.

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