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Why polar excitons stay sharp: parity protection of the center-of-mass recoil channel in exciton-phonon scattering
In polar semiconductors the Fröhlich interaction is the dominant electron--phonon coupling, yet excitonic resonances in materials such as halide perovskites remain anomalously sharp. We show that standard frozen-center-of-mass treatments of the exciton--phonon problem miss the decisive kinematic deg
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