Longitudinal phonon plasmon mode coupling in β-Ga2O3

Schubert, Mathias,1966-Linköpings universitet,Halvledarmaterial,Tekniska fakulteten,University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA; Leibniz Institute for Polymer Research, Dresden 01069, Germany; (författare)

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
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.

Mock, AlyssaLinköpings universitet,Halvledarmaterial,Tekniska fakulteten(Swepub:liu)alymo28 (författare)
Korlacki, RafalUniv Nebraska, NE 68588 USA (författare)
Knight, SeanUniv Nebraska, NE 68588 USA (författare)
Galazka, ZbigniewLeibniz Inst Kristallzuchtung, Germany (författare)
Wagner, GuentherLeibniz Inst Kristallzuchtung, Germany (författare)
Wheeler, VirginiaUS Naval Res Lab, DC 20375 USA (författare)
Tadjer, MarkoUS Naval Res Lab, DC 20375 USA (författare)
Goto, KenNovel Crystal Technol Inc, Japan (författare)
Darakchieva, Vanya,1971-Linköpings universitet,Halvledarmaterial,Tekniska fakulteten(Swepub:liu)vanda79 (författare)
Linköpings universitetHalvledarmaterial (creator_code:org_t)

Ingår i:Applied Physics Letters: American Institute of Physics (AIP)114:100003-69511077-3118

Av författaren/redakt...: Schubert, Mathia ...; Mock, Alyssa; Korlacki, Rafal; Knight, Sean; Galazka, Zbignie ...; Wagner, Guenther; visa fler...; Wheeler, Virgini ...; Tadjer, Marko; Goto, Ken; Darakchieva, Van ...; visa färre...

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