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Strange metallic plasmons and optical conductivity in La2−xCaxCuO4 and WTe2.

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Title: Strange metallic plasmons and optical conductivity in La2−xCaxCuO4 and WTe2.
Authors: Arulsamy, Andrew Das1 (AUTHOR) sadwerdna@gmail.com
Source: Applied Physics B: Lasers & Optics. May2025, Vol. 131 Issue 5, p1-18. 18p.
Subjects: Optical conductivity, Permittivity, Ionization energy, Temperature effect, Superconductors
Abstract: We derive the required formalism to evaluate the complex (frequency-dependent) dielectric function and optical conductivity to capture their changes due to doping, temperature and frequency. Subsequently, we apply our microscopic theory to the experimental data obtained from La 2 - x Ca x CuO 4 superconductor and semimetallic WTe 2 to derive the physical mechanisms of complex dielectric and optical conductivity. We find that the frequency-dependent optical conductivity function that changes as a result of doping, temperature and frequency is influenced by the plasmon density, plasmon-plasmon and plasmon-polariton scattering rates. However, for the semiconducting La 2 CuO 4 compound, plasmon density is the dominant contributor to optical conductivity, prior to scattering rate effect at a higher frequency range. In addition, the plasmon density and the stated scattering rates are found to vary distinctly at different frequency ranges, which define the optical conductivity curves for La 2 - x Ca x CuO 4 and WTe 2 when the temperature, chemical composition and photon energy are systematically varied. As usual, we find that the effects of temperature, Ca-doping and changing frequency on optical conductivity data consistently obey the physics derived from the Ionization Energy Theory (IET) and its method. [ABSTRACT FROM AUTHOR]
Copyright of Applied Physics B: Lasers & Optics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: <searchLink fieldCode="AR" term="%22Arulsamy%2C+Andrew+Das%22">Arulsamy, Andrew Das</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> sadwerdna@gmail.com</i>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Physics+B%3A+Lasers+%26+Optics%22">Applied Physics B: Lasers & Optics</searchLink>. May2025, Vol. 131 Issue 5, p1-18. 18p.
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  Data: <searchLink fieldCode="DE" term="%22Optical+conductivity%22">Optical conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Permittivity%22">Permittivity</searchLink><br /><searchLink fieldCode="DE" term="%22Ionization+energy%22">Ionization energy</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature+effect%22">Temperature effect</searchLink><br /><searchLink fieldCode="DE" term="%22Superconductors%22">Superconductors</searchLink>
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  Data: We derive the required formalism to evaluate the complex (frequency-dependent) dielectric function and optical conductivity to capture their changes due to doping, temperature and frequency. Subsequently, we apply our microscopic theory to the experimental data obtained from La 2 - x Ca x CuO 4 superconductor and semimetallic WTe 2 to derive the physical mechanisms of complex dielectric and optical conductivity. We find that the frequency-dependent optical conductivity function that changes as a result of doping, temperature and frequency is influenced by the plasmon density, plasmon-plasmon and plasmon-polariton scattering rates. However, for the semiconducting La 2 CuO 4 compound, plasmon density is the dominant contributor to optical conductivity, prior to scattering rate effect at a higher frequency range. In addition, the plasmon density and the stated scattering rates are found to vary distinctly at different frequency ranges, which define the optical conductivity curves for La 2 - x Ca x CuO 4 and WTe 2 when the temperature, chemical composition and photon energy are systematically varied. As usual, we find that the effects of temperature, Ca-doping and changing frequency on optical conductivity data consistently obey the physics derived from the Ionization Energy Theory (IET) and its method. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Applied Physics B: Lasers & Optics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s00340-025-08454-7
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      – Code: eng
        Text: English
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      – SubjectFull: Optical conductivity
        Type: general
      – SubjectFull: Permittivity
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      – SubjectFull: Ionization energy
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      – SubjectFull: Temperature effect
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      – SubjectFull: Superconductors
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      – TitleFull: Strange metallic plasmons and optical conductivity in La2−xCaxCuO4 and WTe2.
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              Text: May2025
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