Collective modes in the d-density wave state of the cuprates

Details Collective modes in the d-density wave state of the cuprates Collective modes in the d-density wave state of the cuprates

2002-01-30

arxiv.org/abs/cond-mat/0201566v2

Phys. Rev. B 66, 054510 (2002).

Physics

Condensed Matter

Superconductivity

6 pages, 1 eps figure. Minor corrections in text were made and a new reference was added

Scientific paper

10.1103/PhysRevB.66.054510

Using a functional integral formulation, we analyze the collective modes in the $d$-density wave state. Since only discrete symmetries are broken, no massless phase mode is present. The only relevant fluctuation is the amplitude fluctuation of the order parameter, which is treated at the gaussian level above the long range order. These fluctuations give rise to a massive mode, the analog of the U(1) Higgs, or amplitude mode at wave-vector $(\pi,\pi)$. Neutrons in inelastic neutron scattering experiments couple to this mode via the orbital currents and are likely to produce direct measurements of this amplitude boson.

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