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, Takayuki Sota

    Research output: Contribution to journalArticle

    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

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    four-wave mixing
    excitons
    valence
    single crystals
    spectroscopy
    linear polarization
    polarized light
    electron energy
    dipoles
    electric fields
    energy
    photons
    configurations

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Valence-band-ordering of a strain-free bulk ZnO single crystal identified by four-wave-mixing spectroscopy technique. / Hazu, K.; Chichibu, S. F.; Adachi, S.; Sota, Takayuki.

    In: Journal of Applied Physics, Vol. 111, No. 9, 093522, 01.05.2012.

    Research output: Contribution to journalArticle

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    AU - Hazu, K.

    AU - Chichibu, S. F.

    AU - Adachi, S.

    AU - Sota, Takayuki

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    AB - 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.

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