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2008 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 100, no 8Article in journal (Refereed) Published
Abstract [en]
We report on a strong delay in light propagation through bulk GaN, detected by time-of-flight spectroscopy. The delay increases resonantly as the photon energy approaches the energy of a neutral-donor bound exciton (BX), resulting in a velocity of light as low as 2100 km/s. In the close vicinity of the BX resonance, the transmitted light contains both ballistic and diffusive components. This phenomenon is quantitatively explained in terms of optical dispersion in a medium where resonant light scattering by the BX resonance takes place in addition to the polariton propagation.
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-45904 (URN)10.1103/PhysRevLett.100.087402 (DOI)
2009-10-112009-10-112017-12-13