Nonequilibrium Lieb excitations appear in the exact Floquet spectral function of driven Tonks-Girardeau bosons when the mapped fermions form a Floquet-Fermi sea, and become linear across the Brillouin zone at low frequency.
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Emergence of nonequilibrium Lieb excitations in periodically driven strongly interacting bosons
Nonequilibrium Lieb excitations appear in the exact Floquet spectral function of driven Tonks-Girardeau bosons when the mapped fermions form a Floquet-Fermi sea, and become linear across the Brillouin zone at low frequency.