Collective modes in multiband superfluids and superconductors: Multiple dynamical classes

Abstract

One important way to characterize the states having a gauge symmetry spontaneously broken over multibands should be to look at their collective excitation modes. We find that a three-band system has multiple Leggett modes with significantly different masses, which can be classified into different dynamical classes according to whether multiple inter-band Josephson currents add or cancel. This provides a way to dynamically characterize multiband superconductivity while the pairing symmetry is a static property.

4 pages, 3 figures

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• Theory of light-induced resonances with collective Higgs and Leggett modes in multiband superconductors
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• $H$-$T$ Phase Diagram of Multi-component Superconductors with Frustrated Inter-component Couplings
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