Year: 2009
Type: article
Abstract: A Chern-Simons theory for the doped spin-1/2 kagome 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 $hc/4e$ (as opposed to the usual $hc/2e$ in conventional superconductors) and contains fractional quasiparticles (including fermionic quasiparticles with semionic mutual statistics and spin-1/2 quasiparticles with bosonic self-statistics) in addition to the usual spin-1/2 fermionic Bogoliubov quasiparticles. 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.
Source: Physical Review B
Authors: Wing-Ho Ko, Patrick A. Lee, Xiao-Gang Wen
Institution: Massachusetts Institute of Technology
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2039207947