Isolated true surface wave in a radiative band on a surface of a stressed auxetic.
We demonstrate that a surface resonance (pseudosurface wave) may transform into a true surface wave, i.e., acquire an infinite lifetime, at a single isolated point within a bulk band (radiative region) in a model of a stressed auxetic material. In contrast with the secluded supersonic elastic surface waves, the one found here does not belong to a dispersion line of true surface waves. Therefore we propose to call it an isolated true surface wave (ITSW). The ITSW manifests itself by a deltalike peak in the local density of states and by anomalies in reflection coefficients. The phenomenon may be useful in redirecting energy and/or information from the bulk to the surface in devices supporting guided acoustic waves.
The H. Niewodniczański Institute of Nuclear Physics PAN, ul. Radzikowskiego 152, Kraków 31-342, Poland. Dominik.Trzupek@ifj.edu.pl
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Zieliński