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Article: Electron energy loss spectroscopy of excitons in two-dimensional-semiconductors as a function of temperature

TitleElectron energy loss spectroscopy of excitons in two-dimensional-semiconductors as a function of temperature
Authors
Issue Date2016
Citation
Applied Physics Letters, 2016, v. 108, n. 16, article no. 163107 How to Cite?
AbstractWe have explored the benefits of performing monochromated Electron Energy Loss Spectroscopy (EELS) in samples at cryogenic temperatures. As an example, we have observed the excitonic absorption peaks in single layer Transition Metal Dichalcogenides. These peaks appear separated by small energies due to spin orbit coupling. We have been able to distinguish the split for MoS below 300 K and for MoSe below 220 K. However, the distinction between peaks is only clear at 150 K. We have measured the change in absorption threshold between 150 K and 770 K for MoS and MoSe . We discuss the effect of carbon and ice contamination in EELS spectra. The increased spectral resolution available made possible with modern monochromators in electron microscopes will require the development of stable sample holders which reaches temperatures far below that of liquid nitrogen. 2 2 2 2
Persistent Identifierhttp://hdl.handle.net/10722/298152
ISSN
2023 Impact Factor: 3.5
2023 SCImago Journal Rankings: 0.976
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorTizei, Luiz H.G.-
dc.contributor.authorLin, Yung Chang-
dc.contributor.authorLu, Ang Yu-
dc.contributor.authorLi, Lain Jong-
dc.contributor.authorSuenaga, Kazu-
dc.date.accessioned2021-04-08T03:07:47Z-
dc.date.available2021-04-08T03:07:47Z-
dc.date.issued2016-
dc.identifier.citationApplied Physics Letters, 2016, v. 108, n. 16, article no. 163107-
dc.identifier.issn0003-6951-
dc.identifier.urihttp://hdl.handle.net/10722/298152-
dc.description.abstractWe have explored the benefits of performing monochromated Electron Energy Loss Spectroscopy (EELS) in samples at cryogenic temperatures. As an example, we have observed the excitonic absorption peaks in single layer Transition Metal Dichalcogenides. These peaks appear separated by small energies due to spin orbit coupling. We have been able to distinguish the split for MoS below 300 K and for MoSe below 220 K. However, the distinction between peaks is only clear at 150 K. We have measured the change in absorption threshold between 150 K and 770 K for MoS and MoSe . We discuss the effect of carbon and ice contamination in EELS spectra. The increased spectral resolution available made possible with modern monochromators in electron microscopes will require the development of stable sample holders which reaches temperatures far below that of liquid nitrogen. 2 2 2 2-
dc.languageeng-
dc.relation.ispartofApplied Physics Letters-
dc.titleElectron energy loss spectroscopy of excitons in two-dimensional-semiconductors as a function of temperature-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1063/1.4947058-
dc.identifier.scopuseid_2-s2.0-84968807587-
dc.identifier.volume108-
dc.identifier.issue16-
dc.identifier.spagearticle no. 163107-
dc.identifier.epagearticle no. 163107-
dc.identifier.isiWOS:000375053000034-
dc.identifier.issnl0003-6951-

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