Broken Time-reversal and Electromagnetic Anyon Quasi-Particles in 2D Chiral Plasmon Structures
We report first unambiguous experimental evidence of broken time reversal symmetry for the interaction of light with an artificial non-magnetic material. Polarized colour images of planar chiral gold-on-silicon nanostructures consisting of arrays of gammadions  show intriguing and unusual symmetry: structures, which are geometrically mirror images, loose their mirror symmetry in polarized light . The symmetry of images can only be described in terms of anti-symmetry (black-and-white symmetry) appropriate to a time-odd process.
The effect results from a transverse chiral non-local electromagnetic response of the structure and has some striking resemblance with the expected features of light scattering on anyon matter. We elucidate the physical mechanisms by which electromagnetic excitations coupled to planar chiral waveguides display the essential characteristics of anyons hypothetical particles manifesting fractional angular momentum and broken time reversal symmetry in two spatial dimensions .
1. A. Papakostas; B. Potts; D.M.Bagnall, S.L. Prosvirnin; H.J. Coles; N.I. Zheludev NI, Optical manifestations of planar chirality. Physical Review Letters, vol 90, art. no. 107404, 2003.
2. A. Schwanecke, A. Potts, D. M. Bagnall, A. Zayats and N. I. Zheludev. Broken Time Reversal of Light Interaction with Planar Chiral Nanostructures. http://arxiv.org/abs/cond-mat/0307056 (Physical Review Letters, in press, 2003).
3. E.Wright, N. Zheludev. Broken Time Reversal Symmetry and Electromagnetic Anyons in Planar Chiral Nanostructures. http://arxiv.org/abs/cond-mat/ 0310023 (2003).
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