TY - JOUR
T1 - Anomalous circular polarization of photoluminescence spectra of individual CdSe nanocrystals in an applied magnetic field
AU - Htoon, H.
AU - Crooker, S. A.
AU - Furis, M.
AU - Jeong, S.
AU - Efros, Al L.
AU - Klimov, V. I.
PY - 2009/1/5
Y1 - 2009/1/5
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=59149083353&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=59149083353&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.102.017402
DO - 10.1103/PhysRevLett.102.017402
M3 - Article
AN - SCOPUS:59149083353
VL - 102
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 1
M1 - 017402
ER -