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HL: Fachverband Halbleiterphysik

HL 20: Poster I

HL 20.28: Poster

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

Temperature-Dependent Studies of Interlayer Exciton in PbI2/WS2 Heterostructure — •Tobias Manthei¹, Bhabani Sahoo¹, Ajay Kumar², Abhishek Misra², Chirag Palekar¹, and Stephan Reitzenstein¹ — ¹Institut für Physik und Astronomie, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany — ²Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India; Center for 2D Materials Research and Innovation, IIT Madras, Chennai 600036, India

We present temperature-dependent studies of interlayer exciton in PbI2/WS2 heterostructure. The interlayer exciton formed in such heterostructures consist of electron and hole situated at gamma point in Brillouin zone of respective materials. Hence these dipolar exction are twist angle independent and momentum direct while emitting at room temperature. Taking advantage of the stable nature of the interlayer exciton we investigated radiative lifetime along with polarisation as function of the temperature. We observe relatively long radiative lifetime at low temperature compared to room temperature. Furthermore, we measured the polarisation of the interlayer exciton, which suggests that the emission is elliptically polarised, with peak splitting occurring at high temperatures. This provides insight into spin-valley dynamics. Our studies establish solid foundation for further light-matter interaction experiments related to room temperature interlayer excitons integrated in microcavity.

Keywords: Room temperarture interlayer exciton; Temperature dependence; 2D heterostructures