Thermoreflectance of LiF between 12 and 30 eV Piacentini, M. Lynch, David Lynch, David Olson, C. G.
dc.contributor.department Physics and Astronomy 2018-02-15T18:20:35.000 2020-06-30T06:20:20Z 2020-06-30T06:20:20Z Thu Jan 01 00:00:00 UTC 1976 2015-01-16 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="" target="_blank">10.1103/PhysRevB.13.5530</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/
dc.identifier.articleid 1045
dc.identifier.contextkey 6538509
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath physastro_pubs/52
dc.language.iso en
dc.source.bitstream archive/|||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
Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
824.48 KB
Adobe Portable Document Format