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Longitudinal phonon plasmon mode coupling in β-Ga2O3
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering. University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA; Leibniz Institute for Polymer Research, Dresden 01069, Germany; .ORCID iD: 0000-0001-6238-663X
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering.
Univ Nebraska, NE 68588 USA.
Univ Nebraska, NE 68588 USA.
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2019 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 114, no 10, article id 102102Article in journal (Refereed) Published
Abstract [en]

In this letter, we investigate a set of n-type single crystals of monoclinic symmetry beta-Ga2O3 with different free electron concentration values by generalized far infrared and infrared spectroscopic ellipsometry. In excellent agreement with our previous model prediction, we find here by experiment that longitudinal-phonon-plasmon coupled modes are polarized either within the monoclinic plane or perpendicular to the monoclinic plane. As predicted, all modes change the amplitude and frequency with the free electron concentration. The most important observation is that all longitudinal-phonon-plasmon coupled modes polarized within the monoclinic plane continuously change their direction as a function of free electron concentration.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2019. Vol. 114, no 10, article id 102102
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-156100DOI: 10.1063/1.5089145ISI: 000461512000019Scopus ID: 2-s2.0-85062885181OAI: oai:DiVA.org:liu-156100DiVA, id: diva2:1302140
Note

Funding Agencies|National Science Foundation [DMR 1808715]; Air Force Office of Scientific Research [FA9550-18-1-0360]; Nebraska Materials Research Science and Engineering Center [DMR 1420645]; Swedish Energy Agency [P45396-1]; Swedish Research Council VR Award [2016-00889]; Swedish Foundation for Strategic Research Grant [FL12-0181, RIF14-055, EM16-0024]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University, Faculty Grant SFO Mat LiU [2009-00971]; University of Nebraska Foundation; J. A. Woollam Foundation

Available from: 2019-04-03 Created: 2019-04-03 Last updated: 2019-07-01Bibliographically approved

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Schubert, MathiasDarakchieva, Vanya

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