Dissipative Interaction and Anomalous Surface Absorption of Bulk Phonons at a Two-Dimensional Defect in a Solid

TL;DR

This paper predicts that bulk phonons interacting with a 2D defect in a solid exhibit extreme sensitivity to dissipation, leading to phenomena like near-total transmission or anomalous surface absorption depending on dissipation levels.

Contribution

It introduces a model showing how dissipation dramatically alters phonon reflection and absorption at 2D defects, revealing new resonant behaviors.

Findings

Total resonant reflection occurs only with negligible dissipation.

Weak bulk absorption can switch reflection to near-total transmission.

Intermediate dissipation causes half of the incident energy to be absorbed at the defect.

Abstract

We predict an extreme sensitivity to the dissipative losses of the resonant interaction of bulk phonons with a 2D defect in a solid. We show that the total resonant reflection of the transverse phonon at the 2D defect, described earlier without an account for dissipation, occurs only in the limit of extremely weak dissipation and is changed into almost total transmission by relatively weak bulk absorption. Anomalous surface absorption of the transverse phonon, when one half of the incident acoustic energy is absorbed at the 2D defect, is predicted for the case of "intermediate" bulk dissipation.