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Article Dans Une Revue Journal of Physics: Condensed Matter Année : 2007

Vector part of optical activity probed with x-rays in hexagonal ZnO

Résumé

We discuss how measurements of x-ray circular intensity differentials (XCIDs) could be used to probe the Voigt-Fedorov vector part of optical activity (OA) due to electric dipole-electric quadrupole (E 1E 2) interferences. The first experiment was carried out on a single crystal of zincite (hexagonal ZnO: class 6mm). XCID spectra were recorded in the x-ray resonant diffraction regime near the Zn K edge using the (300) reflection at Bragg angles near 45°. In the x-ray range, the effective operator responsible for the vector part of OA can be assigned to the vector product \mathbf {L} \times {\bOmega }_{L}-{\bOmega }_{L} \times {\mathbf {L}} \propto {\mathbf {n}} , in which L and ΩL are time-reversal odd operators associated with the orbital angular momentum and the orbital anapole respectively, whereas n is a true time-reversal even electric dipole. This is consistent with the pyroelectric properties of zincite crystals.
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Dates et versions

hal-00178965 , version 1 (12-10-2007)

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José Goulon, Andrei Rogalev, Nicolas Jaouen, Fabrice Wilhelm, Chantal Goulon-Ginet, et al.. Vector part of optical activity probed with x-rays in hexagonal ZnO. Journal of Physics: Condensed Matter, 2007, 19, pp.156210. ⟨10.1088/0953-8984/19/15/156201⟩. ⟨hal-00178965⟩
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