Impact of phonons and spin-orbit coupling on Auger recombination in InAs
| Autor: | Daniel Steiauf, Guangsha Shi, Jimmy-Xuan Shen, Chris G. Van de Walle, Anderson Janotti, Emmanouil Kioupakis, Andrew McAllister |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Auger effect Phonon Band gap Fluids & Plasmas Astrophysics::High Energy Astrophysical Phenomena 02 engineering and technology Spin–orbit interaction 021001 nanoscience & nanotechnology 01 natural sciences Resonance (particle physics) Auger symbols.namesake Engineering Physical Sciences Chemical Sciences 0103 physical sciences symbols Atomic physics 010306 general physics 0210 nano-technology Excitation Direct process |
| Zdroj: | PHYSICAL REVIEW B, vol 100, iss 15 Physical Review B, vol 100, iss 15 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | We extend the methodology for calculating Auger recombination from first principles to include spin-orbit interaction, which allows us to study materials in which the spin-orbit splitting and the band gap are of similar magnitude. We use this methodology to compute the direct and indirect Auger coefficients in InAs and related alloys. The direct process involves only Coulomb interaction, while the indirect process is mediated by phonons. We show how the spin-orbit split-off states allow for efficient direct Auger recombination, greatly enhancing the excitation rate of Auger holes due to a near resonance between the spin-orbit splitting and the band gap of the material. We find that the direct hole-hole-electron Auger recombination coefficient decays exponentially with increasing band gap, while the electron-electron-hole Auger recombination coefficient decays faster than exponentially. Additionally, we modeled the phonon-assisted process in InAs and show that the direct Auger process is dominant. |
| Databáze: | OpenAIRE |
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