Linear dichroism of CdSe nanodots: Large anisotropy of the band-gap absorption induced by ground-state dipole moments

F. van Mourik, G. Giraud, D. Tonti, M. Chergui, G. van der Zwan

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Abstract

We measured the electric field induced linear dichroism for a wide range of sizes of CdSe nanocrystals. Large ground-state dipole moments were observed, especially for the smallest crystals. In these, we found a very large anisotropy of the absorption and most of the dipole strength is along the direction of the ground-state dipole moment. For the anisotropy, we propose a mechanism for intensity borrowing from intraband transitions, induced by the field of the ground-state dipole moment. © 2008 The American Physical Society.
Original languageEnglish
Pages (from-to)165303
JournalPhysical Review B. Condensed Matter and Materials Physics
Volume77
Issue number1, Pages = 165303,
DOIs
Publication statusPublished - 2008

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