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The anisotropic quasi-static permittivity of single-crystal <bold>beta</bold>-Ga2O3 measured by terahertz spectroscopy
Univ Utah, UT 84112 USA.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering.
Univ Utah, UT 84112 USA.
Univ Nebraska Lincoln, NE 68588 USA.
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2020 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 117, no 25, article id 252103Article in journal (Refereed) Published
Abstract [en]

The quasi-static anisotropic permittivity parameters of electrically insulating beta gallium oxide (beta -Ga2O3) were determined by terahertz spectroscopy. Polarization-resolved frequency domain spectroscopy in the spectral range from 200GHz to 1THz was carried out on bulk crystals along different orientations. Principal directions for permittivity were determined along crystallographic axes c and b and reciprocal lattice direction a *. No significant frequency dispersion in the real part of dielectric permittivity was observed in the measured spectral range. Our results are in excellent agreement with recent radio frequency capacitance measurements as well as with extrapolations from recent infrared measurements of phonon mode and high-frequency contributions and close the knowledge gap for these parameters in the terahertz spectral range. Our results are important for applications of beta -Ga2O3 in high-frequency electronic devices.

Place, publisher, year, edition, pages
AMER INST PHYSICS , 2020. Vol. 117, no 25, article id 252103
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:liu:diva-172916DOI: 10.1063/5.0031464ISI: 000603064200003OAI: oai:DiVA.org:liu-172916DiVA, id: diva2:1522787
Note

Funding Agencies|Air Force Office of Scientific ResearchUnited States Department of DefenseAir Force Office of Scientific Research (AFOSR) [FA9550-18-1-0507, FA9550-18-1-0360, FA9550-18-1-0332]; National Science FoundationNational Science Foundation (NSF) [DMR 1808715, ECCS 1810096, DMR 1420645]; Swedish Governmental Agency for Innovation Systems (VINNOVA) under Competence Center Program [2016-05190]; Swedish Research Council VRSwedish Research Council [2016-00889]; Swedish Foundation for Strategic ResearchSwedish Foundation for Strategic Research [RIF14-055, EM16-0024]; Knut and Alice Wallenbergs FoundationKnut & Alice Wallenberg Foundation; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University, Faculty Grant SFO Mat LiU [2009-00971]; Leibniz Association, Germany; University of Nebraska Foundation; J. A. Woollam Foundation

Available from: 2021-01-26 Created: 2021-01-26 Last updated: 2023-12-28

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