Wide bandgap semiconductors

Green laser

We are strengthening our role in the development of solid-state quantum systems, such as optical active spin quantum bits, quantum memories and registers.

These are basic elements required for various applications in quantum technologies, e.g. long-distance quantum communications, quantum sensing and quantum computing. Our expertise extends from materials science, which includes design and growth of quantum-grade materials (SiC, III-nitrides and other semiconductors) and structures for nanophotonic and other quantum devices, to characterization, control and manipulation of optical spin qubits.

We also develop MOCVD of group III nitrides, particularly ultra-wide bandgap AlN, and resolve doping issues. We further develop group III nitrides at the 2D limit by leading predictive theoretical modeling and MOCVD approaches and explore new material performance for electronics at nanoscale.

Publications

2026

Jun-Jae Choi, Seung-Jae Hwang, Seoyoung Paik, Juhwan Kim, Jawad Ul-Hassan, Son Tien Nguyen, Hiroshi Abe, Takeshi Ohshima, Jaekwon Suk, Hyeon-Ho Jeong, Dong-Hee Kim, Sang-Yun Lee (2026) Spectator-transition crosstalk in a spin-3=2 silicon-vacancy qudit in silicon carbide revealed by broadband Ramsey interferometry Physical Review Applied, Vol. 26, Article 034030 (Article in journal) https://dx.doi.org/10.1103/qjsy-1m59
Daniela Gogova-Petrova, Dat Tran, Vallery Stanishev, Danial Shafizadeh, Ching-Lien Hsiao, Minho Kim, B. Pecz, A. Kovacs, K. Frey, A. Sulyok, Niraj Kumar Singh, Arnaud Le Febvrier, Per Eklund, Vanya Darakchieva (2026) Epitaxial MgSnN2 on 4H-SiC (0001): An Earth-Abundant Nitride for Green Optoelectronics and Photovoltaics Advanced Optical Materials (Article in journal) https://dx.doi.org/10.1002/adom.71758
Seung-Jae Hwang, Jun-Jae Choi, Seoyoung Paik, Jawad Ul-Hassan, Hiroshi Abe, Takeshi Ohshima, Son Tien Nguyen, Sang-Yun Lee (2026) Thermal performance of a compact cryostat with an in-vacuum objective for color center spin-photon interfaces in silicon carbide Current applied physics, Vol. 90, p. 29-39 (Article in journal) https://dx.doi.org/10.1016/j.cap.2026.06.011
Ali Tayefeh Younesi, Minh Tuan Luu, Christopher Linderalv, Vytautas Zalandauskas, Marianne Etzelmuller Bathen, Son Tien Nguyen, Takeshi Ohshima, Gergo Thiering, Lukas Razinkovas, Ronald Ulbricht (2026) Unraveling the Electronic Structure of Silicon Vacancy Centers in 4H-SiC Advanced Functional Materials, Vol. 36, Article e76183 (Article in journal) https://dx.doi.org/10.1002/adfm.76183
Yu-Hsuan Hsu, Roger Magnusson, Rohini Sanikop, Shailesh Kalal, Justinas Palisaitis, Sagar Jathar, Katrin Pingen, Per Sandström, Issa Nseir, Arnaud le Febvrier, Urban Forsberg, Ray-Hua Horng, Kenneth Järrendahl, Per Eklund, Vanya Darakchieva, Jens Birch, Ching-Lien Hsiao (2026) Growth and optical properties of polar-, nonpolar, and semi-polar wurtzite ScGaN films Applied Physics Letters, Vol. 129, Article 031902 (Article in journal) https://dx.doi.org/10.1063/5.0325421
Danial Shafizadeh, Valdas Jokubavicius, Koichi Murata, Hidekazu Tsuchida, Peter Udvarhelyi, Guodong Bian, Oliver Lang, Merve Karaman, Diego Haya Enriquez, Moritz Brehm, Thomas Fromherz, Michael Trupke, Jianwu Sun, Rositsa Yakimova, Igor Abrikosov, Son Tien Nguyen, Adam Gali, Ivan Gueorguiev Ivanov (2026) Vanadium photoluminescence in 3C-SiC Physical Review B, Vol. 113, Article 075201 (Article in journal) https://dx.doi.org/10.1103/nv8v-gwlv

2025

Son Tien Nguyen, Ivan Gueorguiev Ivanov (2025) Defect engineering and charge state control of color centers in silicon carbide Nanophotonics with Diamond and Silicon Carbide for Quantum Technologies, p. 277-299 (Chapter in book) https://dx.doi.org/10.1016/B978-0-443-13717-4.00015-3
Erlend Lemva Ousdal, Misagh Ghezellou, Jawad Ul-Hassan, Andrej Kuznetsov, Lasse Vines, Marianne Etzelmuller Bathen (2025) Identification of electrically active defects in 6H-SiC Physical Review Materials, Vol. 9, Article 124601 (Article in journal) https://dx.doi.org/10.1103/qzfw-162p
Issam Belgacem, Pasquale Cilibrizzi, Muhammad Junaid Arshad, Daniel White, Malte Kroj, Christiaan Bekker, Margherita Mazzera, Brian D. Gerardot, Angelo C. Frangeskou, Gavin W. Morley, Son Tien Nguyen, Jawad Ul-Hassan, Takeshi Ohshima, Hiroshi Abe, Lorenzo Vinco, Dario Polli, Giulio Cerullo, Cristian Bonato (2025) Broadband Fourier transform spectroscopy of quantum emitters photoluminescence with sub-nanosecond temporal resolution OPTICA QUANTUM, Vol. 3, p. 335-345 (Article in journal) https://dx.doi.org/10.1364/OPTICAQ.565729
Jannis Hessenauer, Jonathan Koerber, Misagh Ghezellou, Jawad Ul-Hassan, Georgy V. Astakhov, Wolfgang Knolle, Joerg Wrachtrup, David Hunger (2025) Cavity enhancement of V2 centers in 4H-SiC with a fiber-based Fabry-Perot microcavity OPTICA QUANTUM, Vol. 3, p. 175-181 (Article in journal) https://dx.doi.org/10.1364/OPTICAQ.557206

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