Electro- and thermoreflectance of Bi2Te3 and Bi2Se3 |
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Authors: | K. Taniguchi A. Moritani C. Hamaguchi J. Nakai |
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Affiliation: | Department of Electronics, Faculty of Engineering, Osaka University, Suita, Osaka, Japan |
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Abstract: | Electroreflectance measurements in Bi2Te3 and Bi2Se3 with the electric field vector of the incident light both inclined and perpendicular to the C-axis have been made at room temperature. The structures found by other workers in the reflection measurements are observed in the present experiment, together with new structures at 0.91 eV, 1.18 eV, 1.78 eV, and 2.61 eV in Bi2Se3 which are not related to formerly observed transitions. From these measurements, the selection rules for direct optical transitions in Bi2Te3 and Bi2Se3 are studied. Thermoreflectance measurements are also made at both room and liquid-nitrogen temperatures. The positions of the peaks obtained in the present work are compared with the electroreflectance and reflection data. |
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