dc.contributor.author	Raha, Sreyan
dc.contributor.author	Srivastava, Divya
dc.contributor.author	Biswas, Subhajit
dc.contributor.author	Garcia-Gil, Adrià
dc.contributor.author	Karttunen, Antii J.
dc.contributor.author	Holmes, Justin D.
dc.contributor.author	Singha, Achintya
dc.contributor.funder	Science and Engineering Research Board	en
dc.contributor.funder	Science Foundation Ireland	en
dc.contributor.funder	CSC – IT Center for Science	en
dc.date.accessioned	2022-01-10T12:32:42Z
dc.date.available	2022-01-10T12:32:42Z
dc.date.issued	2021-12-08
dc.date.updated	2022-01-07T12:20:42Z
dc.description.abstract	Germanium (Ge) plays a crucial role in setting up important functionalities for silicon-compatible photonics. Diamond cubic germanium is an extensively studied semiconductor, although its other exotic forms, like BC8, ST8, ST12 phases, may possess distinct electronic properties. We have fabricated stable ST12-Ge nanowires via a self-seeded bottom-up three phase growth in a confined supercritical toluene environment. Here, we report on the direct evidence of the presence of the ST12 phase by a combination of Raman spectroscopy and first-principles calculations using density functional theory (DFT). It is important to remark that the DFT calculation predicts all the Raman active optical phonon modes of the P 4321 structure, and it is in very good agreement with the experimental results. The phonon dynamics as a function of temperature is investigated through Raman measurements at temperatures varying from 80 to 300 K. First-order temperature coefficients for all the observed Raman modes are estimated from the linear temperature dependence of the phonon shifts. A complete set of isobaric Grüneisen parameters is reported for all Raman modes of ST12-Ge nanowire, and the values are lower compared to the same for Si, dc-Ge bulk, and Ge nanowire. These results have important implications for understanding thermal properties of ST12-Ge nanowire.	en
dc.description.sponsorship	Science and Engineering Research Board (SERB), India (File No. EMR/2017/002107); CSC, Finland (the Finnish IT Center for Science, computational resources)	en
dc.description.status	Peer reviewed	en
dc.description.version	Accepted Version	en
dc.format.mimetype	application/pdf	en
dc.identifier.articleid	232105	en
dc.identifier.citation	Raha, S., Srivastava, D., Biswas, S., Garcia-Gil, A., Karttunen, A. J., Holmes, J. D. and Singha, A. (2021) 'Probing lattice dynamics in ST12 phase germanium nanowires by Raman spectroscopy', Applied Physics Letters, 119, (7 pp). doi: 10.1063/5.0066744	en
dc.identifier.doi	10.1063/5.0066744	en
dc.identifier.endpage	7	en
dc.identifier.issn	0003-6951
dc.identifier.journaltitle	Applied Physics Letters	en
dc.identifier.startpage	1	en
dc.identifier.uri	https://hdl.handle.net/10468/12376
dc.identifier.volume	119	en
dc.language.iso	en	en
dc.publisher	AIP Publishing	en
dc.relation.project	info:eu-repo/grantAgreement/SFI/SFI Investigator Programme/14/IA/2513/IE/Silicon Compatible, Direct Band-Gap Nanowire Materials For Beyond-CMOS Devices/	en
dc.relation.uri	https://aip.scitation.org/doi/10.1063/5.0066744
dc.rights	Published under an exclusive license by AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Appl. Phys. Lett. 119, 232105 (2021) and may be found at https://doi.org/10.1063/5.0066744	en
dc.subject	In-situ integration	en
dc.subject	Density of states	en
dc.subject	High pressure	en
dc.subject	Amorphous silicon	en
dc.subject	Crystal structure	en
dc.subject	Ge	en
dc.subject	Anodes	en
dc.subject	Transitions	en
dc.subject	Nanocrystals	en
dc.subject	Parameters	en
dc.subject	First-principle calculations	en
dc.subject	Polymorphism	en
dc.subject	Nanowires	en
dc.subject	Lattice dynamics	en
dc.subject	Germanium	en
dc.subject	Raman spectroscopy	en
dc.subject	Density functional theory	en
dc.title	Probing lattice dynamics in ST12 phase germanium nanowires by Raman spectroscopy	en
dc.type	Article (peer-reviewed)	en

Probing lattice dynamics in ST12 phase germanium nanowires by Raman spectroscopy

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