Optical absorption driven by dynamical symmetry breaking in indium oxide

Morris, Andrew J.; Monserrat, Bartomeu

doi:10.1103/physrevb.98.161203

Cited by 14 publications

(12 citation statements)

References 73 publications

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“…[30] to the fact that phonons lower the symmetry of the here simulated ideal crystal. Such effect has previously been observed in other materials [79][80][81]. Importantly, our BSE calculation at finite momentum allows us to access the location of the first indirect transition as well as the amount of the excitonic effects.…”

Section: Comparison Between Theory and Experimentssupporting

confidence: 65%

A consistent picture of excitations in cubic BaSnO$_{3}$ revealed by combining theory and experiment

Aggoune,

Eljarrat,

Nabok

et al. 2021

Preprint

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Section: Comparison Between Theory and Experimentssupporting

confidence: 65%

A consistent picture of excitations in cubic BaSnO$_{3}$ revealed by combining theory and experiment

Aggoune,

Eljarrat,

Nabok

et al. 2021

Preprint

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“…The electronic structure of BAs is also influenced by the spin-orbit interaction, which lifts the triple degeneracy of the valence band maximum, and by electron-electron correlation effects, which are required to capture the correct magnitude of the band gap [8,[22][23][24]. Furthermore, temperature changes have been shown to significantly modify the band gap [25][26][27][28][29] and absorption spectrum [30][31][32][33][34][35][36][37][38] of multiple semiconductors.…”

Section: Introductionmentioning

confidence: 99%

Finite temperature optoelectronic properties of BAs from first principles

Bravić

Monserrat

2019

Phys. Rev. Materials

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The high thermal conductivity of boron arsenide (BAs) makes it a promising material for optoelectronic applications in which thermal management is central. In this work, we study the finite temperature optoelectronic properties of BAs by considering both electron-phonon coupling and thermal expansion. The inclusion of electron-phonon coupling proves imperative to capture the temperature dependence of the optoelectronic properties of the material, while thermal expansion makes a negligible contribution due to the highly covalent bonding character of BAs. We predict that with increasing temperature the optical absorption onset is subject to a red shift, the absorption peaks become smoother, and the phonon-assisted absorption at energies below those of the optical gap has a coefficient that lies in the range 10 −3 -10 −4 cm −1 . We also show that good agreement with the measured indirect band gap of BAs is only obtained if exact exchange, electron-phonon coupling, and spin-orbit coupling effects are all included in the calculations.

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“…There is a lack of consensus on the room temperature crystal structure in the literature, with the majority reporting a triclinic structure (space group 1) 19,25,26 . Both C2/m andP 1 space groups are centrosymmetric; however, responses associated with broken inversion symmetry may still occur due to the presence of interfaces/surfaces in the MQW structure 14,27 . Giant Rashba splitting was inferred in a recent spectroscopic study of 2D-PEPI 28 and has since initiated strong interest in this material 25,26,29 .…”

mentioning

confidence: 99%

Circular photogalvanic spectroscopy of Rashba splitting in 2D hybrid organic–inorganic perovskite multiple quantum wells

et al. 2020

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The two-dimensional (2D) Ruddlesden−Popper organic-inorganic halide perovskites such as (2D)-phenethylammonium lead iodide (2D-PEPI) have layered structure that resembles multiple quantum wells (MQW). The heavy atoms in 2D-PEPI contribute a large spin-orbit coupling that influences the electronic band structure. Upon breaking the inversion symmetry, a spin splitting ('Rashba splitting') occurs in the electronic bands. We have studied the spin splitting in 2D-PEPI single crystals using the circular photogalvanic effect (CPGE). We confirm the existence of Rashba splitting at the electronic band extrema of 35±10 meV, and identify the main inversion symmetry breaking direction perpendicular to the MQW planes. The CPGE action spectrum above the bandgap reveals spin-polarized photocurrent generated by ultrafast relaxation of excited photocarriers separated in momentum space. Whereas the helicity dependent photocurrent with below-gap excitation is due to spin-galvanic effect of the ionized spin-polarized excitons, where spin polarization occurs in the spin-split bands due to asymmetric spin-flip.

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Optical absorption driven by dynamical symmetry breaking in indium oxide

Cited by 14 publications

References 73 publications

A consistent picture of excitations in cubic BaSnO$_{3}$ revealed by combining theory and experiment

A consistent picture of excitations in cubic BaSnO$_{3}$ revealed by combining theory and experiment

Finite temperature optoelectronic properties of BAs from first principles

Circular photogalvanic spectroscopy of Rashba splitting in 2D hybrid organic–inorganic perovskite multiple quantum wells

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