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Band-to-band transitions, selection rules, effective mass, and excitonic contributions in monoclinic beta-Ga2O3
University of Nebraska, NE 68588 USA.
University of Nebraska, NE 68588 USA.
University of Nebraska, NE 68588 USA.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering.
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2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 96, no 24, article id 245205Article in journal (Refereed) Published
Abstract [en]

We employ an eigenpolarization model including the description of direction dependent excitonic effects for rendering critical point structures within the dielectric function tensor of monoclinic beta-Ga2O3 yielding a comprehensive analysis of generalized ellipsometry data obtained from 0.75-9 eV. The eigenpolarization model permits complete description of the dielectric response. We obtain, for single-electron and excitonic band-to-band transitions, anisotropic critical point model parameters including their polarization vectors within the monoclinic lattice. We compare our experimental analysis with results from density functional theory calculations performed using the Gaussian-attenuation-Perdew-Burke-Ernzerhof hybrid density functional. We present and discuss the order of the fundamental direct band-to-band transitions and their polarization selection rules, the electron and hole effective mass parameters for the three lowest band-to-band transitions, and their excitonic contributions. We find that the effective masses for holes are highly anisotropic and correlate with the selection rules for the fundamental band-to-band transitions. The observed transitions are polarized close to the direction of the lowest hole effective mass for the valence band participating in the transition.

Place, publisher, year, edition, pages
American Physical Society, 2017. Vol. 96, no 24, article id 245205
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-144258DOI: 10.1103/PhysRevB.96.245205ISI: 000419008900006Scopus ID: 2-s2.0-85040165150OAI: oai:DiVA.org:liu-144258DiVA, id: diva2:1173633
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]; Swedish Research Council [VR2013-5580, VR2016-00889]; Swedish Foundation for Strategic Research (SSF) [FFL12-0181, RIF14-055]; NSF [CMMI 1337856, EAR 1521428]; J. A. Woollam Foundation

Available from: 2018-01-12 Created: 2018-01-12 Last updated: 2018-01-31Bibliographically approved

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