Absence of Phase-Fluctuation Contribution to the Low-Frequency Optical Conductivity in d-Wave Superconductors at Zero Temperature |
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Authors: | L Benfatto A Toschi and S Caprara |
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Affiliation: | (1) Institut de Physique, Université de Fribourg, Chemin du Musée 3, CH-1700 Fribourg, Switzerland;(2) Dipartimento di Fisica, Università di Roma La Sapienza, and Istituto Nazionale per la Fisica della Materia (INFM), SMC and Unità di Roma 1, Piazzale Aldo Moro, 2-00185 Rome, Italy |
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Abstract: | The behavior of the low-frequency optical conductivity reg() in superconducting cuprates is, at the present, an open and interesting issue. In particular, since the zero-temperature and zero-frequency limit of reg() attains a value much larger than the universal value expected within a self-consistent T-matrix calculation, an intriguing possibility is that the collective mode can also contribute to reg(). By taking into account the effect of dissipation on the collective mode in a d-wave superconductor, we evaluate the phase-fluctuation contribution to reg(0) within the formalism of the phase-only action. We show that even though the collective mode contributes to reg() at finite frequencies, approaching the zero-temperature and zero-frequency regime the corrections at reg() due to phase fluctuations vanish. |
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Keywords: | d-wave superconductor low-frequency optical quasiparticle |
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