Tuesday, May 21, 2013

1305.4579 (Filippo Alpeggiani et al.)

Josephson surface plasmons in spatially confined cuprate superconductors    [PDF]

Filippo Alpeggiani, Lucio Claudio Andreani
The Josephson plasma wave (JPW) is a characteristic low-energy excitation in high-Tc cuprate superconductors, arising from interlayer tunneling of the superfluid density along the c-axis. In this work we determine the surface excitations that arise when the superconductor supporting the JPW is spatially confined in the form of a small spherical particle, leading to fully localized Josephson surface plasmons. We show that such excitations can be probed by optical scattering and electron energy-loss spectroscopy. The case of multilayered superconductors supporting a transverse-optical JPW is treated in detail. The present results generalize the theory of surface plasmons in metal nanoparticles to the case of spherical particles made of layered high-Tc superconductors.
View original: http://arxiv.org/abs/1305.4579

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