Optical Response of an Interacting Polaron Gas in Strongly Polar Crystals
| Autor: | J. T. Devreese, Serghei Klimin, Cesare Franchini, Georg Kresse, Jacques Tempere |
|---|---|
| Přispěvatelé: | Klimin S., Tempere J., Devreese J.T., Franchini C., Kresse G. |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Phonon Physics::Optics FOS: Physical sciences 02 engineering and technology condensed_matter_physics Polaron 01 natural sciences Optical conductivity lcsh:Technology lcsh:Chemistry chemistry.chemical_compound Condensed Matter - Strongly Correlated Electrons Condensed Matter::Materials Science Condensed Matter::Superconductivity 0103 physical sciences General Materials Science 010306 general physics Instrumentation lcsh:QH301-705.5 Mixing (physics) optical response Fluid Flow and Transfer Processes polaron many-polaron systems Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) lcsh:T Process Chemistry and Technology Physics General Engineering Many-polaron system 021001 nanoscience & nanotechnology lcsh:QC1-999 Computer Science Applications Chemistry chemistry lcsh:Biology (General) lcsh:QD1-999 lcsh:TA1-2040 Quasiparticle Strontium titanate 0210 nano-technology Random phase approximation Fermi gas lcsh:Engineering (General). Civil engineering (General) lcsh:Physics |
| Zdroj: | Applied Sciences Volume 10 Issue 6 Applied Sciences, Vol 10, Iss 6, p 2059 (2020) |
| ISSN: | 2076-3417 |
| Popis: | Optical conductivity of an interacting polaron gas is calculated within an extended random phase approximation which takes into account mixing of collective excitations of the electron gas with LO phonons. This mixing is important for the optical response of strongly polar crystals where the static dielectric constant is rather high: strontium titanate is the case. The present calculation sheds light on unexplained features of experimentally observed optical conductivity spectra in $n$-doped SrTiO$_{3}$. These features appear to be due to dynamic screening of the electron-electron interaction by polar optical phonons and hence do not require additional mechanisms for the explanation. Comment: 8 pages, 1 figure |
| Databáze: | OpenAIRE |
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