IBS 2DQH Seminar

July 04 2024, 2:00 PM
Sungkyunkwan University, Suwon

Photonics and devices with defect centers in hexagonal boron nitride

Maciej Koperski

Institute for Functional Intelligent Materials, National University of Singapore

Abstract

The controllable creation of defect centers in hexagonal boron nitride (hBN) emerges as an appealing method of raising functionalities in a wide band gap van der Waals material. These are mostly based on single photon emission [1,2] when individual defects are properly isolated. The large band gap is conducive to hosting a variety of stable emitters in the ultraviolet, visible, and near-infrared spectral regions. I will review our recent work on characterizing these centers through a combination of optical [3] and scanning tunneling [4] microscopy/spectroscopy. The fundamental understanding of the energetics [5] and carrier dynamics related to the optical and electrical excitation of defect centers enabled us to create diverse functionalities, such as sensors of dielectric constant in the atomic limit [6], coupling with silicon photonics, and light-emitting devices based on vertical tunneling junctions [7].

References

1. M. Koperski, K. Nogajewski, M. Potemski, Single photon emitters in boron nitride: More than a supplementary material, Optics Communications 411, 158-165 (2018).

2. M. Koperski, K. Pakuła, K. Nogajewski, A. K. Dąbrowska, M. Tokarczyk, T. Pelini, J. Binder, T. Fąs, J. Suffczyński, R. Stępniewski, A. Wysmołek, M. Potemski, Towards practical applications of quantum emitters in boron nitride, Scientific Reports 11 (1), 15506 (2021).

3. M. Koperski, D. Vaclavkova, K. Watanabe, T. Taniguchi, K. S. Novoselov, M. Potemski, Midgap radiative centers in carbon-enriched hexagonal boron nitride, PNAS 117 (24) 13214-13219 (2020).

4. Z. Qiu, K. Vaklinova, P. Huang, M. Grzeszczyk, H. Yang, K. Watanabe, T. Taniguchi, K. S. Novoselov, J. Lu, M. Koperski, Atomic structure of carbon centres in hBN: towards engineering of single photon sources, arXiv preprint arXiv:2110.07842 (2024).

5. P. Huang, M. Grzeszczyk, K. Vaklinova, K. Watanabe, T. Taniguchi, K. S. Novoselov, M. Koperski, Carbon and vacancy centers in hexagonal boron nitride, Phys. Rev. B 106, 014107 (2022).

6. D. I. Badrtdinov, C. Rodriguez‐Fernandez, M. Grzeszczyk, Z. Qiu, K. Vaklinova, P. Huang, A. Hampel, K. Watanabe, T. Taniguchi, L. Jiong, M. Potemski, C. E. Dreyer, M. Koperski, M. Rösner, Dielectric environment sensitivity of carbon centers in hexagonal boron nitride, Small 19 (41), 2300144 (2023).

7. M. Grzeszczyk, K. Vaklinova, K. Watanabe, T. Taniguchi, K. S. Novoselov, M. Koperski, Electrical excitation of carbon centers in hexagonal boron nitride with tuneable quantum efficiency, arXiv:2305.13679 (2023).

Brief Biography

Dr. Maciej Koperski is an Assistant Professor at the National University of Singapore. His research interests cover a broad range of phenomena in materials, including magneto-optics, quantum light emission, magnetism and/or electronics.

The work of Dr. Koperski contributed to development of single photon emitters in van der Walls materials, excitonic physics at different dimensionalities and diverse spin/orbital wave function compositions or electrical excitations of interband transitions in material systems with unique band structure.

Dr. Koperski co-authored reviews on topical subjects in condensed matter physics: magneto-optical properties of transition metal chalcogenides (Nanophotonics 2017) and magnetism in 2D systems (Nature Nanotechnology 2019).