| Autor: |
Vitiello, Elisa, Rossi, Simone, Broderick, Christopher A., Gravina, Giorgio, Balocchi, Andrea, Marie, Xavier, O'Reilly, Eoin P., Myronov, Maksym, Pezzoli, Fabio |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Phys. Rev. Applied 14, 064068 (2020) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevApplied.14.064068 |
| Popis: |
We present a magneto-optical study of the carrier dynamics in compressively strained Ge(1-x)Sn(x) films having Sn compositions up to 10% epitaxially grown on blanket Ge on Si (001) virtual substrates. We leverage the Hanle effect under steady-state excitation to study the spin-dependent optical transitions in presence of an external magnetic field. This allowed us to obtain direct access to the dynamics of the optically-induced carrier population. Our approach singled out that at cryogenic temperatures the effective lifetime of the photogenerated carriers in coherent Ge(1-x)Sn(x) occurs in the sub-ns time scale. Supported by a model estimate of the radiative lifetime, our measurements indicate that carrier recombination is dominated by non-radiative processes. Our results thus provide central information to advance the fundamental understanding of carrier kinetics in this novel direct-gap group-IV material system. Such knowledge can be a stepping stone in the quest for the implementation of Ge(1-x)Sn(x)-based functional devices. |
| Databáze: |
arXiv |
| Externí odkaz: |
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