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Coordinate-Invariant Lyddane-Sachs-Teller Relationship for Polar Vibrations in Materials with Monoclinic and Triclinic Crystal Systems
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering. University of Nebraska, NE, USA; Leibniz Institute Polymer Research Dresden, Germany.ORCID iD: 0000-0001-6238-663X
2016 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 117, no 21, article id 215502Article in journal (Refereed) Published
Abstract [en]

A coordinate-invariant generalization of the Lyddane-Sachs-Teller relation is presented for polar vibrations in materials with monoclinic and triclinic crystal systems. The generalization is derived from an eigendielectric displacement vector summation approach, which is equivalent to the microscopic Born-Huang description of polar lattice vibrations in the harmonic approximation. An expression for a general oscillator strength is also described for materials with monoclinic and triclinic crystal systems. A generalized factorized form of the dielectric response characteristic for monoclinic and triclinic materials is proposed. The generalized Lyddane-Sachs-Teller relation is found valid for monoclinic beta-Ga2O3, where accurate experimental data became available recently from a comprehensive generalized ellipsometry investigation [Phys. Rev. B 93, 125209 (2016)]. Data for triclinic crystal systems can be measured by generalized ellipsometry as well, and are anticipated to become available soon and results can be compared with the generalized relations presented here.

Place, publisher, year, edition, pages
American Physical Society , 2016. Vol. 117, no 21, article id 215502
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Other Engineering and Technologies not elsewhere specified
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URN: urn:nbn:se:liu:diva-133266DOI: 10.1103/PhysRevLett.117.215502ISI: 000388282500003PubMedID: 27911546OAI: oai:DiVA.org:liu-133266DiVA, id: diva2:1057480
Note

Funding Agencies|National Science Foundation (NSF) through the Center for Nanohybrid Functional Materials [EPS 1004094]; Nebraska Materials Research Science and Engineering Center [DMR 1420645]; [CMMI 1337856]

Available from: 2016-12-18 Created: 2016-12-15 Last updated: 2018-01-12

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