Regensburg 2025 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 29: Poster II

HL 29.46: Poster

Tuesday, March 18, 2025, 18:00–20:00, P1

Temperature-dependent Studies of Boron-Vacancy Spin Defects in hexagonal Boron Nitride — •Selin Steinicke, Paul Konrad, Andreas Sperlich, and Vladimir Dyakonov — Experimental Physics 6, University of Würzburg, 97074 Würzburg, Germany

Optically addressable spin-carrying defects in solid-state materials are promising candidates in the field of quantum information technology and sensing applications. The recently discovered negatively charged Boron vacancies (V_B⁻) in hexagonal Boron Nitride (hBN) raised the prospect of quantum sensing in a two-dimensional material. Although numerous studies on hBN emerged in the last years, the optical pump cycle has not yet been fully researched. Temperature-dependent spectroscopy on V_B⁻ ensembles shows broad photoluminescence around 850 nm and an increase in intensity at cryogenic temperatures. Using temperature-dependent transient photoluminescence measurements, we investigate the non-radiative relaxation path from the triplet excited state into the triplet ground state via the metastable intermediate state. The dependence of the intermediate state’s lifetime on temperature is examined. These results shed light into the dark processes of V_B⁻ and can be used to optimize coherent control of V_B⁻, which leads to a higher sensitivity in quantum sensing.

Keywords: hBN; Boron-Vacancy; Optical Spectroscopy; Transient Photoluminescence; Coherent Control