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Low-temperature infrared dielectric function of hyperbolic α-quartz

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Winta,  Christopher
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Wolf,  Martin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Paarmann,  Alexander
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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PhysRevB.99.144308.pdf
(Publisher version), 11MB

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Citation

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.


Cite as: http://hdl.handle.net/21.11116/0000-0003-934F-F
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.