Band-to-band transitions, selection rules, effective mass, and excitonic contributions in monoclinic β-Ga2 O3

Alyssa Mock, Rafał Korlacki, Chad Briley, Vanya Darakchieva, Bo Monemar, Yoshinao Kumagai, Ken Goto, Masataka Higashiwaki, Mathias Schubert

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

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 β-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.

Original languageEnglish (US)
Article number245205
JournalPhysical Review B
Volume96
Issue number24
DOIs
StatePublished - Dec 29 2017

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Electron transitions
Polarization
Electrons
Ellipsometry
Valence bands
Density functional theory
Tensors
critical point
polarization
ellipsometry
Direction compound
electrons
attenuation
tensors
density functional theory
valence

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Band-to-band transitions, selection rules, effective mass, and excitonic contributions in monoclinic β-Ga2 O3. / Mock, Alyssa; Korlacki, Rafał; Briley, Chad; Darakchieva, Vanya; Monemar, Bo; Kumagai, Yoshinao; Goto, Ken; Higashiwaki, Masataka; Schubert, Mathias.

In: Physical Review B, Vol. 96, No. 24, 245205, 29.12.2017.

Research output: Contribution to journalArticle

Mock, A, Korlacki, R, Briley, C, Darakchieva, V, Monemar, B, Kumagai, Y, Goto, K, Higashiwaki, M & Schubert, M 2017, 'Band-to-band transitions, selection rules, effective mass, and excitonic contributions in monoclinic β-Ga2 O3', Physical Review B, vol. 96, no. 24, 245205. https://doi.org/10.1103/PhysRevB.96.245205
Mock, Alyssa ; Korlacki, Rafał ; Briley, Chad ; Darakchieva, Vanya ; Monemar, Bo ; Kumagai, Yoshinao ; Goto, Ken ; Higashiwaki, Masataka ; Schubert, Mathias. / Band-to-band transitions, selection rules, effective mass, and excitonic contributions in monoclinic β-Ga2 O3. In: Physical Review B. 2017 ; Vol. 96, No. 24.
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