Pseudogap, competing order, and the coexistence of staggered flux and d-wave pairing in high-temperature superconductors
Sen Zhou, Ziqiang Wang
DOI 10.1103/PhysRevB.70.020501 · Physical Review B
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Abstract
We study the t−J−V model of a doped Mott insulator in connection to high-Tc superconductors. The nearest neighbor Coulomb interaction (V) is treated quantum mechanically on equal footing as the antiferromagnetic exchange interaction (J). Motivated by the SU(2) symmetry at half-filling, we construct a large-N theory which allows a systematic study of the interplay between staggered flux order and superconductivity upon doping. We solve the model in the large-N limit and obtain the ground state properties and the phase diagram as a function of doping. We discuss the competition and the coexistence of the staggered flux and the d-wave superconductivity in the underdoped regime and the disappearance of superconductivity in the overdoped regime.
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