Strange metallic plasmons and optical conductivity in La2−xCaxCuO4 and WTe2.
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| Title: | Strange metallic plasmons and optical conductivity in La |
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| 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] |
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| Database: | Engineering Source |
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| 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] |
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| ISSN: | 09462171 |
| DOI: | 10.1007/s00340-025-08454-7 |
