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

doi:10.1063/1.5089145

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

Electrical & Computer Engineering

Research output: Contribution to journal › Article

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 language	English (US)
Article number	102102
Journal	Applied Physics Letters
Volume	114
Issue number	10
DOIs	https://doi.org/10.1063/1.5089145
State	Published - Mar 11 2019

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.5089145

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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

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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.",

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T1 - Longitudinal phonon plasmon mode coupling in β -Ga2O3

AU - Schubert, Mathias

AU - Mock, Alyssa

AU - Korlacki, Rafał

AU - Knight, Sean

AU - Galazka, Zbigniew

AU - Wagner, Günther

AU - Wheeler, Virginia

AU - Tadjer, Marko

AU - Goto, Ken

AU - Darakchieva, Vanya

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