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Bogoliubov Quasiparticle Excitations in the Two-Dimensional t-J Model

Y. Ohta·T. Shimozato·R. Eder·S. Maekawa
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Abstract

Using a proposed numerical technique for calculating anomalous Green's functions characteristic of superconductivity, we show that the low-lying excitations in a wide parameter and doping region of the two-dimensional $t$$-$$J$ model are well described by the picture of dressed Bogoliubov quasiparticles in the BCS pairing theory. The pairing occurs predominantly in $d_{x^2-y^2}$-wave channel and the energy gap has a size $Δ_d$$\simeq$$0.15J$$-0.27J$ between quarter and half fillings. Opening of the superconducting gap in the photoemission and inverse-photoemission spectrum is demonstrated.

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Y. Ohta, T. Shimozato, R. Eder, S. Maekawa. 1994-03-22. Bogoliubov Quasiparticle Excitations in the Two-Dimensional t-J Model. https://doi.org/10.1103/physrevlett.73.324

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