Dispersion of the π resonance in the superconducting state of the cuprates
Jiang-Ping Hu, Shou-Cheng Zhang
DOI 10.1103/PhysRevB.64.100502 · Physical Review B
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Abstract
We study the dispersion of π resonance in the superconducting state within the projected SO(5) model [S.C. Zhang et al., Phys. Rev. B 60, 13 070 (1999)]. Away from the commensurate momentum, the propagation of the π resonance creates phase flips in the superconducting order parameter. This frustration effect leads to a strong dressing of the π resonance and a downward dispersion away from the commensurate wave vector. Based on these results, we argue that the commensurate resonance and incommensurate magnetic fluctuations in the cuprates are continuously connected.
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