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HL: Fachverband Halbleiterphysik

HL 20: Poster I

HL 20.30: Poster

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

Manipulation of hybrid interlayer excitons in homobilayer MoS₂ — •Ankur Arora, Mathias Federolf, Atanu Patra, Subhamoy Sahoo, Monika Emmerling, Anuj Kumar Singh, Simon Betzold, and Sven Höfling — Lehrstuhl für Technische Physik, Julius-Maximilians-Universität Würzburg, Würzburg, Germany

Van der Waals (vdW) heterostructures of transition metal dichalcogenide materials provide a versatile platform for novel excitonic phenomena. Homobilayer MoS₂ is particularly attractive, as its hybrid interlayer excitons (hIX) possess a permanent dipole moment with high oscillator strength, even at room temperature and exhibit tunability via the quantum-confined Stark effect under an external DC electric field. In this work, we investigated the optical properties of hIX in homobilayer MoS₂, which is electrically contacted with few-layer graphene (FLG) and encapsulated in hexagonal boron nitride (hBN). The hBN encapsulation improves the optical response by narrowing the excitonic linewidths, revealing the effect of the dielectric environment. By applying a vertical electric field, we show the Stark splitting of the peaks of the hIX. The vdW heterostructure is transferred onto a distributed Bragg reflector (DBR) with pre-patterned contacts forming a half-cavity design. This architecture serves as a critical first step toward the fabrication of a full microcavity, enabling the exploration of strong light-matter coupling. Our results pave the way for electrically tuning these dipolar hIX polaritons inside a microcavity for fundamental studies on exciton condensates and exciton polariton-induced superconductivity.

Keywords: 2D TMDC materials; interlayer excitons; microcavity; optoelectronics; distributed Bragg reflectors (DBR)