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HL: Fachverband Halbleiterphysik

HL 39: ZnO and Relatives II

HL 39.7: Talk

Tuesday, March 27, 2012, 13:00–13:15, EW 202

Hydrostatic pressure dependence of the refractive index in ZnO and GaN — •Felix Käss^1,2, Juan Sebastian Reparaz^1,2, Gordon Callsen², Markus Raphael Wagner², Alejandro Rodolfo Goñi^1,3, Maria Isabel Alonso¹, Miquel Garriga¹, and Axel Hoffmann² — ¹Institut de Ciència de Materials de Barcelona-CSIC, Esfera UAB, 08193, Bellaterra, Spain — ²Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstr. 36, u o a 10623 Berlin, Germany — ³ICREA, Passeig Lluís Companys 23, 08010 Barcelona, Spain

In this work we will present the hydrostatic pressure dependence of the real part of the refractive index in ZnO and GaN. By using a diamond anvil cell (DAC) combined with an optical transmission experiment we study the Fabry-Pérot interferences in the transparency region (approx. below 3.2 eV). A large series of interference peaks arising from the cavity-modes allow for the determination of the energy dependent refractive index. Many experimental complications which we found to be critical will be discussed in detail, leading to a detailed description of the optimum characteristics which are required for an ethalon to optically manifest in the DAC enviroment.