Diagnosing phases of magnetic insulators via noise magnetometry with spin qubits

Abstract

Two-dimensional magnetic insulators exhibit a plethora of competing ground states, such as ordered (anti)ferromagnets, exotic quantum spin liquid states with topological order and anyonic excitations, and random singlet phases emerging in highly disordered frustrated magnets. Here we show how single spin qubits, which interact directly with the low-energy excitations of magnetic insulators, can be used as a diagnostic of magnetic ground states. Experimentally tunable parameters, such as qubit level splitting, sample temperature, and qubit-sample distance, can be used to measure spin correlations with energy and wavevector resolution. Such resolution can be exploited, for instance, to distinguish between fractionalized excitations in spin liquids and spin waves in magnetically ordered states, or to detect anyonic statistics in gapped systems.

arXiv comment15 + 11 pages, 4 figures, 2 tables; (v2) Minor edits, updated references

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• Hydrodynamic sound modes and Galilean symmetry breaking in a magnon fluid
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• Correlation holes and slow dynamics induced by fractional statistics in gapped quantum spin liquids
• Quantum Sensing of Spin Fluctuations of Magnetic Insulator Films with Perpendicular Anisotropy
• Probing the Berezinskii-Kosterlitz-Thouless vortex unbinding transition in two-dimensional superconductors using local noise magnetometry
• Charge-Neutral Electronic Excitations in Quantum Insulators
• Quantum Sensing of Broadband Spin Dynamics and Magnon Transport in Antiferromagnets
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• A generalized model of magnon kinetics and subgap magnetic noise
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• Higher-order topology and corner triplon excitations in two-dimensional quantum spin-dimer models
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• Flavors of Magnetic Noise in Quantum Materials
• Fractional Spin Quantum Hall Effect in Weakly Coupled Spin Chain Arrays
• The Future of the Correlated Electron Problem
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• Anomalous Proximitized Transport in Metal/Quantum Magnet Heterostructure $\mathrm{B}{\mathrm{i}}_2\mathrm{I}{\mathrm{r}}_2{\mathrm{O}}_7/Y{\mathrm{b}}_2\mathrm{T}{\mathrm{i}}_2{\mathrm{O}}_7$
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• Hearing the light: stray-field noise from the emergent photon in quantum spin ice
• Probing GHz Spin Dynamics Across Magnetic Phase Transitions in CrCl3 Nanoflakes Using Nitrogen-Vacancy Microscopy
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