QED in Optically Active Media: Enhanced Spontaneous Emission and Chiral   Yet Parity Conserving Corrections to the Electron Mass
  The electromagnetic field inside an isotropic optically active medium is quantized on the base of Fedorov's model for optical activity. The modified photon propagator is derived. Using this result it is shown that the QED correction to the electron mass contains chiral terms which nevertheless are parity invariant. The spontaneous emission rate of a two-level atom is shown to increase in the medium. The spontaneously emitted radiation is partially polarized. 
Karl-Peter Marzlin