Doped Kagome System as Exotic Superconductor
Abstract
A Chern--Simons theory for the doped spin-1/2 kagom\'e system is constructed, from which it is shown that the system is an exotic superconductor that breaks time-reversal symmetry. It is also shown that the system carries minimal vortices of flux (as opposed to the usual in conventional superconductors) and contains fractional quasiparticles (including fermionic quasiparticles with \emph{semionic} mutual statistics and spin-1/2 quasiparticles with \emph{bosonic} self-statistics) in addition to the usual spin-1/2 fermionic Bougoliubov quasiparticle. Two Chern--Simons theories--one with an auxiliary gauge field kept and one with the auxiliary field and a redundant matter field directly eliminated--are presented and shown to be consistent with each other.
Cite
@article{arxiv.0804.1359,
title = {Doped Kagome System as Exotic Superconductor},
author = {Wing-Ho Ko and Patrick A. Lee and Xiao-Gang Wen},
journal= {arXiv preprint arXiv:0804.1359},
year = {2009}
}
Comments
13 pages, 7 figures and 1 table; Extensive revision and expansion, including a new section on classifying the quasiparticles and a new section on an alternative Chern--Simons Lagrangian