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Author

M. Atambo

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Preprint Aug 2026

Parity-controlled electron-hole interference in exciton-phonon coupling

We demonstrate that exciton-phonon coupling in polar semiconductors is governed by a parity-controlled interference selection rule. By performing an exact multipole expansion of the excitonic form factor and validating it against numerical integration of hydrogenic envelope functions, we show that the long-range infrar...

M. Atambo · 3 citations
Preprint Oct 2026

Why polar excitons stay sharp: parity protection of the center-of-mass recoil channel in exciton-phonon scattering

In polar semiconductors the Fr\"ohlich 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 degree of freedom: re...

M. Atambo · 1 citation
Preprint Aug 2026

Symmetry-protected intraband exciton-phonon scattering and its breakdown by mass asymmetry

The coupling of excitons to lattice vibrations is typically treated via phenomenological models that artificially separate long-range Fr\"ohlich and short-range Holstein interactions. Recent analytical work has established that, in the delocalized limit, Fr\"ohlich scattering is suppressed by electron--hole interferenc...

M. Atambo · 4 citations

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