Sensing chiral magnetic noise via quantum impurity relaxometry

Abstract

We present a theory for quantum impurity relaxometry of magnons in thin films, exhibiting quantitative agreement with recent experiments without needing arbitrary scale factors used in theoretical models thus far. Our theory reveals that chiral coupling between prototypical spin>1/2 quantum impurities and magnons plays a central role in determining impurity relaxation, which is further corroborated by our experiments on nickel films interfaced with nitrogen-vacancy centers. Along with advancing magnonics and understanding decoherence in hybrid quantum platforms with magnets, the ability of a quantum impurity spin to sense chiral magnetic noise presents an opportunity to probe chiral phenomena in condensed matter.

arXiv comment6 pages, 4 figures

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• Quantum magnonics: when magnon spintronics meets quantum information science
• Opportunities for long-range magnon-mediated entanglement of spin qubits via on- and off-resonant coupling
• Chirality as Generalized Spin-Orbit Interaction in Spintronics
• Quantum Sensing of Spin Transport Properties of an Antiferromagnetic Insulator
• Observation and control of hybrid spin-wave-Meissner-current transport modes
• Broadband microwave detection using electron spins in a hybrid diamond-magnet sensor chip
• Non-Hermitian coherent coupling of nanomagnets by exchange spin waves
• Magnon-mediated qubit coupling determined via dissipation measurements
• Single-spin qubit magnetic spectroscopy of two dimensional superconductivity
• Quantum noise spectroscopy of dynamical critical phenomena
• Filtering and imaging of frequency-degenerate spin waves using nanopositioning of a single-spin sensor
• Directional excitation of a high-density magnon gas using coherently driven spin waves
• Topological Hybrids of Magnons and Magnon Bound Pairs
• Theory of spin center sensing of diffusion
• Interplay between charge and spin noise in the near-surface theory of decoherence and relaxation of $C_{3v}$ symmetry qutrit spin-1 centers
• Local noise spectroscopy of Wigner crystals in two-dimensional materials
• Quantitative imaging of nonlinear spin-wave propagation using diamond quantum sensors
• Quantum simulation of spin-1/2 XYZ model using solid-state spin centers
• Long-distance coupling of spin qubits via topological magnons