Calculation of Delta (k,omega) for a 2D t-J cluster

Details Calculation of Delta (k,omega) for a 2D t-J cluster Calculation of Delta (k,omega) for a 2D t-J cluster

2002-02-11

arxiv.org/abs/cond-mat/0202180v2

Phys. Rev. B 66, 052513 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, 1 table, submitted to PRL

Scientific paper

10.1103/PhysRevB.66.052513

Using numerical techniques, the diagonal and off-diagonal superconducting one-electron Green's functions are calculated for a two-dimensional (2D) t-J model on a periodic 32-site cluster at low doping. From these Green's functions, the momentum and frequency dependence of the pairing gap $\Delta ({\bf k}, \omega)$ are extracted. It has $d_{x^2-y^2}$ symmetry and exhibits $\omega$-dependent structure which depend upon J/t. We find that the pairing gap persists down to small J/t values. The frequency- and momentum-dependent renormalized energy and renormalization factor are also calculated.

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