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We study the t-J-V model of a doped Mott insulator in connection to high-T_csuperconductors. The nearest neighbor Coulomb interaction (V) is treatedquantum mechanically on equal footing as the antiferromagnetic exchangeinteraction (J). Motivated by the SU(2) symmetry at half-filling, we constructa large-N theory which allows a systematic study of the interplay betweenstaggered flux order and superconductivity upon doping. We solve the model inthe large-N limit and obtain the ground state properties and the phase diagramas a function of doping. We discuss the competition and the coexistence of thestaggered flux and the d-wave superconductivity in the underdoped regime andthe disappearance of superconductivity in the overdoped regimeComment: 5 pages, 3 figures, published versio

physical review. b, condensed matter and materials physics

Pseudogap, competing order, and the coexistence of staggered flux and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>d</mml:mi></mml:mrow></mml:math>-wave pairing in high-temperature superconductors

Pseudogap, competing order, and the coexistence of staggered flux andd-wave pairing in high-temperature superconductors