Thermoreflectance of LiF between 12 and 30 eV
dc.contributor.author | Piacentini, M. | |
dc.contributor.author | Lynch, David | |
dc.contributor.author | Lynch, David | |
dc.contributor.author | Olson, C. G. | |
dc.contributor.department | Physics and Astronomy | |
dc.date | 2018-02-15T18:20:35.000 | |
dc.date.accessioned | 2020-06-30T06:20:20Z | |
dc.date.available | 2020-06-30T06:20:20Z | |
dc.date.copyright | Thu Jan 01 00:00:00 UTC 1976 | |
dc.date.embargo | 2015-01-16 | |
dc.date.issued | 1976-06-01 | |
dc.description.abstract | <p>The thermoreflectance spectrum of LiF between 12 and 30 eV was measured and several of the structures interpreted. The absorption-edge region is interpreted in terms of a Wannier exciton series converging to the fundamental band gap Γ15→Γ1. Structure associated directly with the band gap is not manifest, so the Γ15−Γ1 energy is determined indirectly to be 14.2 ± 0.2 eV. The n=1 exciton state generates the first strong structure in Δε̃ and we suggest that the exciton-phonon interaction, along with a central-cell correction, can give a significant contribution to its binding energy. Structures at higher energy have been associated with the interband transitions L3′→L1 and L2′→L1 between the crystal-field-split valence band at L and the lower conduction band. The strong electron-hole interaction modifies the expected line shape and a hyperbolic exciton, associated with the transitions at L, may exist as an antiresonance in the continuum. A strong feature at 22.2 eV in Δε̃ is associated with excitonic transitions at X involving the second d-like conduction band. The corresponding peak at 26.4 eV in Δ[Im(−1ε̃)] overlaps the "valence-band" plasmon at 24.6 eV. No evidence for double excitations is found around 25 eV in either Δε̃ or Δ[Im(−1ε̃)]. The Δ[Im(−1ε̃)] spectrum shows for the first time which structures in the energy-loss function are generated by longitudinal excitons and which by plasmons.</p> | |
dc.description.comments | <p>This article is from <em>Physical Review B </em>13 (1976): 5530, doi:<a href="http://dx.doi.org/10.1103/PhysRevB.13.5530" target="_blank">10.1103/PhysRevB.13.5530</a>. Posted with permission.</p> | |
dc.format.mimetype | application/pdf | |
dc.identifier | archive/lib.dr.iastate.edu/physastro_pubs/52/ | |
dc.identifier.articleid | 1045 | |
dc.identifier.contextkey | 6538509 | |
dc.identifier.s3bucket | isulib-bepress-aws-west | |
dc.identifier.submissionpath | physastro_pubs/52 | |
dc.identifier.uri | https://dr.lib.iastate.edu/handle/20.500.12876/57299 | |
dc.language.iso | en | |
dc.source.bitstream | archive/lib.dr.iastate.edu/physastro_pubs/52/1976_Lynch_ThermoreflectanceL1F.pdf|||Sat Jan 15 00:46:29 UTC 2022 | |
dc.source.uri | 10.1103/PhysRevB.13.5530 | |
dc.subject.disciplines | Condensed Matter Physics | |
dc.subject.disciplines | Physics | |
dc.subject.keywords | Ames Laboratory | |
dc.subject.keywords | Wannier exciton | |
dc.subject.keywords | electron-hole interaction | |
dc.title | Thermoreflectance of LiF between 12 and 30 eV | |
dc.type | article | |
dc.type.genre | article | |
dspace.entity.type | Publication | |
relation.isAuthorOfPublication | fa3aaf34-6c45-4f1c-9296-edcfc98e117b | |
relation.isOrgUnitOfPublication | 4a05cd4d-8749-4cff-96b1-32eca381d930 |
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