Two-phonon scattering terms in a lattice Bose polaron can significantly alter the dispersion and may produce a bound state not present in Fröhlich-type single-phonon models.
atively small interaction geff = 3.2 in Figure 1a, MF and the flow equations yield essentially identical results
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Operator Valued Flow Equation Approach to the Bosonic Lattice Polaron: Dispersion Renormalization Beyond the Fr\"ohlich Paradigm
Two-phonon scattering terms in a lattice Bose polaron can significantly alter the dispersion and may produce a bound state not present in Fröhlich-type single-phonon models.