| EMMINGER, Carola, Nuwanjula S. SAMARASINGHA, Melissa Rivero ARIAS, Farzin ABADIZAMAN, José MENÉNDEZ a Stefan ZOLLNER. Excitonic effects at the temperature-dependent direct bandgap of Ge. Journal of Applied Physics. American Institute of Physics, 2022, roč. 131, č. 16, s. 1-10. ISSN 0021-8979. Dostupné z: https://dx.doi.org/10.1063/5.0080158. |
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@article{1856277,
author = {Emminger, Carola and Samarasingha, Nuwanjula S. and Arias, Melissa Rivero and Abadizaman, Farzin and Menéndez, José and Zollner, Stefan},
article_number = {16},
doi = {http://dx.doi.org/10.1063/5.0080158},
keywords = {Dielectrics; Energy gap; Linear filters; Room temperature; Spectroellipsometry; Temperature; Temperature dependence},
language = {eng},
issn = {0021-8979},
journal = {Journal of Applied Physics},
title = {Excitonic effects at the temperature-dependent direct bandgap of Ge},
url = {https://aip.scitation.org/doi/abs/10.1063/5.0080158},
volume = {131},
year = {2022}
}
TY - JOUR
ID - 1856277
AU - Emminger, Carola - Samarasingha, Nuwanjula S. - Arias, Melissa Rivero - Abadizaman, Farzin - Menéndez, José - Zollner, Stefan
PY - 2022
TI - Excitonic effects at the temperature-dependent direct bandgap of Ge
JF - Journal of Applied Physics
VL - 131
IS - 16
SP - 1-10
EP - 1-10
PB - American Institute of Physics
SN - 00218979
KW - Dielectrics
KW - Energy gap
KW - Linear filters
KW - Room temperature
KW - Spectroellipsometry
KW - Temperature
KW - Temperature dependence
UR - https://aip.scitation.org/doi/abs/10.1063/5.0080158
N2 - The temperature dependence of the complex dielectric function 𝜖1+𝑖𝜖2 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 𝑘⋅𝑝 theory and literature values for effective masses, reasonable agreement with the experiment is obtained for 𝜖2 up to room temperature using the direct bandgap and its broadening as the only adjustable parameters.
ER -
EMMINGER, Carola, Nuwanjula S. SAMARASINGHA, Melissa Rivero ARIAS, Farzin ABADIZAMAN, José MENÉNDEZ a Stefan ZOLLNER. Excitonic effects at the temperature-dependent direct bandgap of Ge. \textit{Journal of Applied Physics}. American Institute of Physics, 2022, roč.~131, č.~16, s.~1-10. ISSN~0021-8979. Dostupné z: https://dx.doi.org/10.1063/5.0080158.
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