Continuous-wave magneto-optical determination of the carrier lifetime in coherent Ge1-xSnx/Ge heterostructures

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dc.contributor.authorVitiello, Elisa
dc.contributor.authorRossi, Simone
dc.contributor.authorBroderick, Christopher A.
dc.contributor.authorGravina, Giorgio
dc.contributor.authorBalocchi, Andrea
dc.contributor.authorMarie, Xavier
dc.contributor.authorO'Reilly, Eoin P.
dc.contributor.authorMyronov, Maksym
dc.contributor.authorPezzoli, Fabio
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderNational University of Irelanden
dc.date.accessioned2021-05-14T10:46:26Z
dc.date.available2021-05-14T10:46:26Z
dc.date.issued2020-12-23
dc.date.updated2021-05-14T10:36:57Z
dc.description.abstractWe present a magneto-optical study of the carrier dynamics in compressively strained Ge1-xSnx films with Sn content up to 10% epitaxially grown on Ge on Si(001) virtual substrates. We leverage the Hanle effect under steady-state excitation to study the spin-dependent optical transitions in the presence of an external magnetic field. This allows us to obtain direct access to the dynamics of the optically induced carrier population. Our approach reveals that at cryogenic temperatures the effective lifetime of the photo-generated carriers in coherent Ge1-xSnx is on the subnanosecond timescale. Supported by a model estimate of the radiative lifetime, our measurements indicate that carrier recombination is dominated by nonradiative processes. Our results thus provide central information to improve the fundamental understanding of carrier kinetics in this advanced direct-band-gap group-IV-material system. Such knowledge can be a stepping stone in the quest for the implementation of Ge1-xSnx-based functional devices.en
dc.description.sponsorshipNational University of Ireland (Post-Doctoral Fellowship in the Sciences)en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid064068en
dc.identifier.citationVitiello, E., Rossi, S., Broderick, C. A., Gravina, G., Balocchi, A., Marie, X., O'Reilly, E. P., Myronov, M. and Pezzoli, F. (2020) 'Continuous-wave magneto-optical determination of the carrier lifetime in coherent Ge1-xSnx/Ge heterostructures', Physical Review Applied, 14, 064068 (9pp). doi: 10.1103/PhysRevApplied.14.064068en
dc.identifier.doi10.1103/PhysRevApplied.14.064068en
dc.identifier.eissn2331-7019
dc.identifier.endpage9en
dc.identifier.journaltitlePhysical Review Applieden
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/11317
dc.identifier.volume14en
dc.language.isoenen
dc.publisherAmerican Physical Societyen
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Investigator Programme/15/IA/3082/IE/Multiscale Simulation and Analysis of emerging Group IV and III-V Semiconductor Materials and Devices/en
dc.rights© 2020, American Physical Society. All rights reserved.en
dc.subjectRecent progressen
dc.subjectLasersen
dc.subjectPhotodetectorsen
dc.subjectGeSnen
dc.titleContinuous-wave magneto-optical determination of the carrier lifetime in coherent Ge1-xSnx/Ge heterostructuresen
dc.typeArticle (peer-reviewed)en
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