Where is the pi particle?

Details Where is the pi particle? Where is the pi particle?

2000-09-05

arxiv.org/abs/cond-mat/0009072v1

Phys. Rev. B 63, 144507 (2001)

Physics

Condensed Matter

Superconductivity

RevTeX, 5 pages, 4 eps figures

Scientific paper

10.1103/PhysRevB.63.144507

We discuss the interplay of particle-particle and particle-hole spin-triplet channels in high-T_c superconductors using a quasiparticle dispersion motivated by angle-resolved photoemission. Within a generalized RPA, we find a well defined antibound state of two holes, the pi resonance of Demler and Zhang, as well as a bound state of a particle and a hole, the spin exciton. We show that the energy of the pi resonance always exceeds 2 Delta, twice the maximum d-wave gap, therefore the neutron resonance observed in the cuprates around energy Delta is most likely a spin exciton. At the same time, we speculate that the pi particle can exist at higher energies and might be observed in neutron scattering around 100 meV.

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