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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 32: 2D Materials IV (joint session HL/CPP)

CPP 32.3: Talk

Wednesday, March 29, 2023, 10:00–10:15, POT 81

Thin hexagonal boron nitride in the deep-UV: The pursuit of single photon emitters and their properties — •Nils Bernhardt¹, Luka Choi¹, Felix Nippert¹, Angus Gentle², Milos Toth², and Markus R. Wagner^1,3 — ¹Technische Universität Berlin, Berlin, Germany — ²University of Technology Sydney, Sydney, Australia — ³Paul-Drude-Institut, Berlin, Germany

Interest in hexagonal boron nitride (hBN) continues to grow in optoelectronics with the discovery of an increasing number of quantum emitters in all spectral ranges. The wide band gap and chemical stability inherent to this material encourage hBN as a semiconductor substrate, while the possibility of reliably fabricating thin films entails unusual and unique properties. Consequently, room-temperature defect quantum emitters with reproducible emission properties from the UV to the near-IR can be engineered for applications such as quantum communication.

In this work, we investigate the recently observed luminescence of hBN at 4.1eV with a pulsed, frequency-tripled titanium-sapphire laser at 240nm. Experimental methods such as photoluminescence spectroscopy and time-resolved fluorescence spectroscopy are utilized alongside a Hanbury Brown and Twiss interferometer for correlation measurements in the deep UV as a means to identify single-photon emitters. Through this approach, we are able to establish a scientific basis for further investigation into the UV emission of hBN.