Longitudinal phonon plasmon mode coupling in β -Ga2O3

Mathias Schubert, Alyssa Mock, Rafał Korlacki, Sean Knight, Zbigniew Galazka, Günther Wagner, Virginia Wheeler, Marko Tadjer, Ken Goto, Vanya Darakchieva

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

In this letter, we investigate a set of n-type single crystals of monoclinic symmetry β-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.

Original languageEnglish (US)
Article number102102
JournalApplied Physics Letters
Volume114
Issue number10
DOIs
StatePublished - Mar 11 2019

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Schubert, M., Mock, A., Korlacki, R., Knight, S., Galazka, Z., Wagner, G., Wheeler, V., Tadjer, M., Goto, K., & Darakchieva, V. (2019). Longitudinal phonon plasmon mode coupling in β -Ga2O3. Applied Physics Letters, 114(10), [102102]. https://doi.org/10.1063/1.5089145