Takagi A, Nakamura A, Yoshikaie A, Yoshioka SI, Adachi S, Chichibu SF, Sota T. Signatures of Γ1-Γ5 mixed-mode polaritons in polarized reflectance spectra of ZnO.
JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012;
24:415801. [PMID:
23006520 DOI:
10.1088/0953-8984/24/41/415801]
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Abstract
Theoretical and experimental studies were carried out on exciton-polaritons excited in ZnO. Polaritons in which both Γ(1) and Γ(5) excitons couple to electromagnetic waves simultaneously are shown to exist, and their signatures are observed in polarized reflectance spectra measured under k is perpendicular to a and E is parallel to c configurations for an m-plane sample. Theoretical calculations reveal that the mixed-mode polaritons consist of one Γ(1) transverse mode and two Γ(5) longitudinal modes. It is also shown that the signatures are sensitive to the valence band ordering.
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