Valence-band-ordering of a strain-free bulk ZnO single crystal identified by four-wave-mixing spectroscopy technique

K. Hazu, S. F. Chichibu, S. Adachi, T. Sota

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7 Citations (Scopus)

Abstract

Spectroscopic and temporal four-wave-mixing (FWM) measurements are carried out on a strain-free bulk ZnO single crystal, in order to clarify the valence-band-ordering. Under the collinearly polarized lights with the electric-field component parallel to the c-axis, which can excite dipole-allowed Γ 1-excitons, the FWM signal appears only in the energies corresponding to the B-exciton. Under the cross-linear polarization configuration exciting both Γ 5- and Γ 1-excitons, the FWM signal arising from the two-photon-coherence is absent in the energies corresponding to A-exciton. Both the results indicate that Γ 1-exciton state belongs exclusively to B-exciton, meaning that the valence-band ordering is Γ 9 - Γ 7 - Γ 7 in order of decreasing electron energy for the present strain-free ZnO single crystal.

Original languageEnglish
Article number093522
JournalJournal of Applied Physics
Volume111
Issue number9
DOIs
Publication statusPublished - 2012 May 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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