Single-spin resonance in van der Waals embedded paramagnetic defect
Nathan Chejanovsky1,2, Amlan Mukherjee1, Jianpei Geng1, Yu-Chen Chen1,9*, Youngwook Kim2,3, Andrej Denisenko1, Amit Finkler4, Takashi Taniguchi5, Kenji Watanabe6, Durga Bhaktavatsala Rao Dasari1, Philipp Auburger7, Adam Gali7,8, Jurgen H. Smet2, Jörg Wrachtrup1,2
13. Physikalisches Institut, Universität Stuttgart, Stuttgart, Germany
2Max Planck Institute for Solid State Research, Stuttgart, Germany
3Department of Emerging Materials Science, DGIST, Daegu, Korea
4Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, Israel
5International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan
6Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan
7Wigner Research Centre for Physics, Budapest, Hungary
8Department of Atomic Physics, Budapest University of Technology and Economics, Budapest, Hungary
9Current address: Research Center for Applied Sciences, Academia Sinica, Taipei, Taiwan
* Presenter:Yu-Chen Chen,
Solid-state defects with optically addressable spin states are a promising platform for the achievements of many quantum applications, such as quantum photonics devices and scalable quantum information architectures etc [1,2]. A plethora of single-photon emitters have been identified in the atomic layers of two-dimensional van der Waals materials [3,4,5]. Amongst them, some quantum emitters in hexagonal boron nitride (hBN) were found to exhibit magnetic field-dependent optical emission such as ensemble of boron vacancy defects [6].
Here, we report on a set of isolated optical emitters embedded in hexagonal boron nitride that exhibit optically detected magnetic resonance. We also demonstrated that one of them is single spin defect. The defect spins show an isotropic ge-factor of ~2 and zero-field splitting below 10 MHz. The photokinetics of one type of the defects is compatible with ground-state electron-spin paramagnetism. We extracted spin-lattice relaxation times T₁ of 13-17 μs with estimated spin coherence times T₂* of around 40-60 ns. We also investigated into the spin dynamics and provided a simple model of the electronic structure. We also used the density functional theory to investigate some potential defect complex candidates. Our results provide some insight into the chemical structure of the defects.
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2.Awschalom, D. D. et al. Nat. Photonics 12, 5160527 (2018).
3.Srivastava, A. et al. Nat. Nanotechnol. 10, 491-496 (2015).
4.Cassabois, G., Valvin, P. & Gil, B. Nat. Photonics 10, 262-266 (2016).
5.Tran, T. T., Bray, K., Ford, M. J., Toth, M. & Aharonovich, I. Nat. Nanotechnol. 11, 37-41 (2015).
6.Gottscholl, A. et al. Nat. Mater. 19, 540–545 (2020).

Keywords: Quantum control, Single photons, Two-dimensional materials, Atomic and nanoscale characterization