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  Low-temperature infrared dielectric function of hyperbolic α-quartz

Winta, C., Wolf, M., & Paarmann, A. (2019). Low-temperature infrared dielectric function of hyperbolic α-quartz. Physical Review B, 99(14): 144308. doi:10.1103/PhysRevB.99.144308.

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PhysRevB.99.144308.pdf (Publisher version), 11MB
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 Creators:
Winta, Christopher1, Author              
Wolf, Martin1, Author              
Paarmann, Alexander1, Author              
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              

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 Abstract: We report the infrared dielectric properties of α-quartz in the temperature range from 1.5K to 200K. Using an infrared free-electron laser, far-infrared reflectivity spectra of a single crystal y cut were acquired along both principal axes, under two different incidence angles, in S and P polarization. These experimental data have been fitted globally for each temperature with a multioscillator model, allowing one to extract frequencies and damping rates of the ordinary and extraordinary, transverse and longitudinal optic phonon modes, and hence the temperature-dependent dispersion of the infrared dielectric function. The results are in line with previous high-temperature studies, allowing for a parametrized description of all temperature-dependent phonon parameters and the resulting dielectric function from 1.5K up to the α−β-phase transition temperature, TC=846K. Using these data, we predict remarkably high quality factors for polaritons in α-quartz's hyperbolic spectral region at low temperatures.

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Language(s): eng - English
 Dates: 2019-02-112019-04-222019-04-01
 Publication Status: Published in print
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevB.99.144308
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: 7 Volume / Issue: 99 (14) Sequence Number: 144308 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008