Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-09-05
Physical Review Letters 102, 017402 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
15 pages, 3 figures; submitted
Scientific paper
10.1103/PhysRevLett.102.017402
We study the low-temperature magneto-photoluminescence (PL) from individual CdSe nanocrystals. Nanocrystals having a small "bright" exciton fine structure splitting ($<$0.5 meV) exhibit a conventional left- and right-circularly polarized Zeeman PL doublet in applied magnetic fields. In contrast, nanocrystals with large fine structure splitting ($>$1 meV) show an anomalous magneto-PL 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.
Crooker Scott A.
Efros Al. L.
Furis Madalina
Htoon H.
Jeong Sangtae
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