Probing superconductivity and pairing symmetry by coherent phonons in multiorbital superconductors
Chandan Setty, Jimin Zhao, Jiangping Hu
DOI 10.1103/PhysRevB.92.140504 · Physical Review B
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Abstract
We show that the phase information contained in coherent phonon oscillations generated by a laser pulse in a multiorbital superconductor can be used as an experimental tool to probe superconductivity and pairing symmetries. The phase difference between the normal and superconducting states is proportional to the superconducting order parameter just below the superconducting transition temperature Tc. It also exhibits different behaviors for superconducting states with different pairing symmetries. In particular, if there is an orbital-dependent internal sign change state, the phase difference can have a discontinuous jump below Tc.
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