Ta. Fisher et al., VACUUM RABI COUPLING ENHANCEMENT AND ZEEMAN SPLITTING IN SEMICONDUCTOR QUANTUM MICROCAVITY STRUCTURES IN A HIGH MAGNETIC-FIELD, Physical review. B, Condensed matter, 53(16), 1996, pp. 10469-10472
Reflectivity spectra of high-quality quantum microcavity structures ar
e investigated in high magnetic fields from 0 to 14 T. Over this field
range we observe an increase in the vacuum Rabi splitting by a factor
of 1.4, due to the magnetic-field-induced increase of exciton oscilla
tor strength. In addition, exciton Zeeman splitting is seen. We demons
trate that this splitting arises from the independent interaction of e
ach exciton spin component with the corresponding circularly polarized
cavity photon mode. We also report anomalous broadening of the higher
-energy polariton feature in high magnetic field, raising doubts that
the same broadening seen at zero magnetic field is due to coupling of
the cavity mode with higher discrete and continuum exciton states.