Abstract
We predict the existence of surface waves in layered superconductors in the THz frequency range, below the Josephson plasma frequency omega J. This wave propagates along the vacuum-superconductor interface and dampens in both transverse directions out of the surface (i.e., towards the superconductor and towards the vacuum). This is the first prediction of propagating surface waves in any superconductor. These predicted surface Josephson plasma waves are important for different phenomena, including the complete suppression of the specular reflection from a sample (Wood's anomalies) and a huge enhancement of the wave absorption (which can be used as a THz detector).
Highlights
We predict the existence of surface waves in layered superconductors in the THz frequency range, below the Josephson plasma frequency !J
These predicted surface Josephson plasma waves are important for different phenomena, including the complete suppression of the specular reflection from a sample (Wood’s anomalies) and a huge enhancement of the wave absorption
We prove that surface Josephson plasma waves can propagate along the surface between the superconductor and the vacuum in a wide frequency range below !J
Summary
Frontier Research System, The Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama, 351-0198, Japan. We predict the existence of surface waves in layered superconductors in the THz frequency range, below the Josephson plasma frequency !J. This wave propagates along the vacuum-superconductor interface and dampens in both transverse directions out of the surface (i.e., towards the superconductor and towards the vacuum). We derive the dispersion relation for these waves and propose ways to excite these We show that these surface waves play an important role in the absorption and reflection of electromagnetic waves, including their resonance dependence on the incident angle.
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