Anomalous circular polarization of photoluminescence spectra of individual CdSe nanocrystals in an applied magnetic field

H. Htoon, S. A. Crooker, M. Furis, S. Jeong, Al L. Efros, V. I. Klimov

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We study the low-temperature magnetophotoluminescence from individual CdSe nanocrystals. Nanocrystals having a small "bright" exciton fine structure splitting (ΔXY<0.5meV) exhibit a conventional left and right circularly polarized Zeeman photoluminescence doublet in applied magnetic fields. In contrast, nanocrystals with large ΔXY (>1meV) show an anomalous magnetophotoluminescence polarization, wherein the lower-energy peak becomes circularly polarized with increasing field, while the higher-energy peak remains linearly polarized. This unusual behavior arises from strong mixing between the absorbing and emitting bright exciton levels due to strong anisotropic exchange interactions.

Original languageEnglish
Article number017402
JournalPhysical review letters
Issue number1
Publication statusPublished - Jan 5 2009


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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