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Phys. Rev. Lett. 102, 017402 (2009) [4 pages]

Anomalous Circular Polarization of Photoluminescence Spectra of Individual CdSe Nanocrystals in an Applied Magnetic Field

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H. Htoon1, S. A. Crooker2, M. Furis2,*, S. Jeong1,†, Al. L. Efros3, and V. I. Klimov1,‡
1Chemistry Division and the Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
2National High Magnetic Field Laboratory, Los Alamos, New Mexico 87545, USA
3Naval Research Laboratory, Washington, D.C. 20375, USA

Received 22 May 2008; published 9 January 2009

We study the low-temperature magnetophotoluminescence from individual CdSe nanocrystals. Nanocrystals having a small “bright” exciton fine structure splitting (ΔXY<0.5  meV) exhibit a conventional left and right circularly polarized Zeeman photoluminescence doublet in applied magnetic fields. In contrast, nanocrystals with large ΔXY (>1  meV) 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.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.017402
DOI:
10.1103/PhysRevLett.102.017402
PACS:
78.67.Bf, 71.35.Ji, 78.55.Et, 78.67.Hc

*Present address: Department of Physics, University of Vermont, Burlington, VT 05405, USA.

†Present address: Korea Institute of Machinery and Materials, Daejon, 305-343, Korea.

‡Corresponding author.

klimov@lanl.gov

 
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