Kohn Anomaly in Phonon Driven Superconductors: Is it simply mathematical or a physical fact?
Mukunda Das, Department of Theoretical Physics, RSPE, ANU
Anomalies often occur in the physical world. Sometimes quite unexpectedly anomalies may give rise to new insight to an unrecognisedphenomenon. In this talk I shall discuss about Kohn anomaly in a conventional phonon-driven superconductor by using a microscopic approach. The equality of Kohn frequency (at which the anomaly takes place) with twice the pair binding energy cannot be accidental. Our analysis provides a nearly complete explanation to this new experimental observation (http://iopscience.iop.org/0953-8984/labtalk-article/52695).