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Updated: May 9, 2026
11:30
Recombination Dynamics in Thin-film Photovoltaic Materials via Time-resolved Microwave Conductivity
Published on: March 6, 2017
Pairing fluctuation ac conductivity of disordered thin films
Aleksandra Petković1, Valerii M Vinokur
1Laboratoire de Physique Théorique et Hautes Energies, Université Pierre et Marie Curie and CNRS, 4 place Jussieu, F-75005 Paris, France. alpetkovic@gmail.com
Summary
We investigated how temperature and frequency affect superconducting film conductivity. New subleading terms in conductivity become significant at higher frequencies, unlike established terms which are suppressed.
Area of Science:
- Condensed Matter Physics
- Superconductivity
- Disordered Systems
Background:
- Superconducting films exhibit fluctuations above the critical temperature, influencing their conductivity.
- Understanding these fluctuations is crucial for applications of superconductivity.
Purpose of the Study:
- To analyze the temperature and frequency dependence of in-plane fluctuation conductivity in disordered superconducting films.
- To identify and characterize new contributions to ac conductivity beyond established models.
Main Methods:
- Utilizing the nonlinear sigma model within the Keldysh technique for theoretical calculations.
- Analyzing fluctuation contributions across a wide frequency range.
Main Results:
- Identified and analyzed subleading terms in Aslamazov-Larkin and Maki-Thompson contributions to ac conductivity at low frequencies (ω ≪ T).
- Calculated the ac correction to the density of states.
- Observed that finite-frequency electromagnetic fields suppress established conductivity contributions but weakly affect new terms and density of states corrections.
Conclusions:
- New, weakly suppressed conductivity terms and density of states corrections become relevant at finite frequencies in disordered superconducting films.
- This finding challenges the dominance of traditional Aslamazov-Larkin and Maki-Thompson contributions in ac conductivity under specific conditions.
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