Dresden 2026 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 20: Poster I

HL 20.29: Poster

Dienstag, 10. März 2026, 18:00–20:00, P1

Effective Theory of Feshbach Resonances in Two-Dimensional Semiconductors — •Maximilian Wolf and Richard Schmidt — Institut für Theoretische Physik, Universität Heidelberg, 69120 Heidelberg, Germany

Feshbach resonances in two-dimensional semiconductor bilayer systems have recently been demonstrated through experiments and first-principles calculations. Motivated by these findings, we introduce an effective model that captures the essential physics of these resonances. We show how the model parameters can be fixed directly from experimental data, enabling us to derive analytical scattering phase shifts and propagators in the few-body limit. With these results, observables at finite chemical potential can be computed using standard many-body techniques. As an example, we evaluate the exciton absorption spectrum in TMD materials and compare our predictions with experimental observations.

Keywords: Feshbach Resonance; Transition-Metal Dichalcogenide; Effective Field Theory