Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 25: Magnetic Imaging and Sensors II

MA 25.12: Talk

Wednesday, March 20, 2024, 12:30–12:45, EB 301

Sensing of magnetic excitations in 2D-materials with NV spins — •Hossein Mohammadzadeh, Dominik Maile, and Joachim Ankerhold — Institute for complex quantum systems (ICQ), University of Ulm, Ulm, Germany

Magnetism in two-dimensional (2D) van der Waals (vdW) materials has recently emerged as one of the most promising areas in condensed matter research, with a significant potential for applications ranging from topological magnonics to low-power spintronics, quantum computing, and optical communications [1]. In this talk, we theoretically investigate the possibility of sensing magnetic excitations in such materials with nitrogen-vacancy (NV) center in diamond. The NV center in diamond is an excellent platform for noninvasively detecting nano-scale signatures and magnetic domain walls [2]. We present a description of the low-energy magnetic excitations within a Kitaev-Heisenberg model for a honeycomb lattice. Coupling these excitations to the single NV-electronic spin paves the way to use magnetic noise spectroscopy to probe magnons in such a system. Utilizing Fermi*s golden rule and quantum linear response theory, we show how the spin relaxation time of the NV alters in the magnetic field induced by magnons in both bulk and topologically protected edge states. The relaxation time of the NV changes by different NV-sample distances and in various strengths of spin-spin interactions inside the material. [1] Qing Hua Wang et al., ACS Nano, 16, 5, 6960-7079 (2022)

[2] Jörg Wrachtrup et al. Nat Commun 12, 1989 (2021)

Keywords: Topological magnonics; Magnetic van der Waals materials; Quantum sensing; NV Centers in Diamond; Quantum noise spectroscopy