Regensburg 2025 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 59: 2D Semiconductors and van der Waals Heterostructures VI

HL 59.4: Talk

Friday, March 21, 2025, 10:15–10:30, H15

Tailoring Interlayer Exciton Dyanamics of TMDC Heterostructures: From Bilayers to Trilayers embeded in Broadband DBR Cavities — •Bhabani Sankar Sahoo, Shachi Machchhar, Chirag Chandrakant Palekar, and Stephan Reitzenstein — Technische Universität Berlin, Berlin, Germany

The photoluminescence yield of interlayer excitons (IX) at room temperature remains limited due to electrons and holes residing in different layers. In this work we propose and implement a novel way to enhance the IX emission in transition metal dichalcogenide (TMDC) heterostructures. We first introduce an additional WSe2 on top of a heterobilayers (HBL) of WSe2/MoSe2 to form a heterotrilayer (HTL) with different twist angles which significantly boost the PL emission upto one order magnitude, attributed to improved overlap of the electronic wavefunctions and additional radiative pathways. Further embedding this HTL within a chirped multiresonant distributed Bragg reflector (DBR) microcavity provides strong exciton confinement, enhancing the radiative recombination rate and modifying the exciton lifetime. Compared to the HBL, the HTL displays a reduced exciton lifetime, indicative of stronger light-matter coupling within the cavity, and a pronounced increase in PL intensity due to enhanced photon density of states. Our study highlights the potential of tailored stacking and cavity integration to manipulate light-matter interactions in advanced TMDC heterostructure devices for next-generation optoelectronic applications.

Keywords: Interlayer Exciton; Heterotrilayer; Chirped Multiresonant DBR; Microcavity; Optoelectronics