Fröhlich Hamiltonian
= Fröhlich Hamiltonian
{c}
A second-quantized electron-phonon Hamiltonian with free <electrons>, harmonic <phonons> and terms linear in <phonon> displacement, $M_qc_{k+q,\sigma}^{\dagger}c_{k,\sigma}(b_q+b_{-q}^{\dagger})$. The name is used for both general linear electron-phonon models and the more specific long-range coupling to polar optical modes; the intended dispersion and <matrix element> must be stated.