Excitonic effects at the temperature-dependent direct bandgap of Ge

Varování

Publikace nespadá pod Pedagogickou fakultu, ale pod Přírodovědeckou fakultu. Oficiální stránka publikace je na webu muni.cz.

Autoři	EMMINGER Carola SAMARASINGHA Nuwanjula S. ARIAS Melissa Rivero ABADIZAMAN Farzin MENÉNDEZ José ZOLLNER Stefan
Rok publikování	2022
Druh	Článek v odborném periodiku
Časopis / Zdroj	Journal of Applied Physics
Fakulta / Pracoviště MU	Přírodovědecká fakulta
Citace
www	https://aip.scitation.org/doi/abs/10.1063/5.0080158
Doi	http://dx.doi.org/10.1063/5.0080158
Klíčová slova	Dielectrics; Energy gap; Linear filters; Room temperature; Spectroellipsometry; Temperature; Temperature dependence
Popis	The temperature dependence of the complex dielectric function ??1+????2 of bulk Ge near the direct bandgap was investigated with spectroscopic ellipsometry at temperatures between 10 and 710?K. Second derivatives of the dielectric function with respect to energy are obtained using a digital linear filter method. A model that incorporates excitonic effects using the Tanguy model for the Hulthén potential [C. Tanguy, Phys. Rev. B 60, 10660 (1999)] was used to fit the dielectric function and its second derivatives simultaneously. Using ??·?? theory and literature values for effective masses, reasonable agreement with the experiment is obtained for ??2 up to room temperature using the direct bandgap and its broadening as the only adjustable parameters.
Související projekty:	Postdoc2MUNI