By switching between multi-cycle and single-cycle THz pulses, the authors selectively excite the pi-band Higgs mode and the Leggett mode in MgB2, resolving a dispute about which mode dominates the nonlinear response.
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Selective excitation of collective modes in multiband superconductor MgB2
By switching between multi-cycle and single-cycle THz pulses, the authors selectively excite the pi-band Higgs mode and the Leggett mode in MgB2, resolving a dispute about which mode dominates the nonlinear response.