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arxiv: 2407.05614 · v2 · pith:EZDVZAONnew · submitted 2024-07-08 · ❄️ cond-mat.mes-hall · quant-ph

Quantum Noise Spectroscopy of Criticality in an Atomically Thin Magnet

Mark E. Ziffer , Francisco Machado , Benedikt Ursprung , Artur Lozovoi , Aya Batoul Tazi , Zhiyang Yuan , Michael E. Ziebel , Tom Delord
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Nanyu Zeng Evan Telford Daniel G. Chica Dane W. deQuilettes Xiaoyang Zhu James C. Hone Kenneth L. Shepard Xavier Roy Nathalie P. de Leon Emily J. Davis Shubhayu Chatterjee Carlos A. Meriles Jonathan S. Owen P. James Schuck Abhay N. Pasupathy
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classification ❄️ cond-mat.mes-hall quant-ph
keywords criticalcorrelationcrsbrmagneticnoiseanalyzingcriticalityfluctuations
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Dynamic critical fluctuations in magnetic materials encode important information about magnetic ordering in the associated critical exponents. Using nitrogen-vacancy centers in diamond, we implement $T_2$ (spin-decoherence) noise magnetometry to study critical dynamics in a 2D Van der Waals magnet CrSBr. By analyzing NV decoherence on time scales approaching the characteristic correlation time $\tau_c$ of critical fluctuations, we extract the critical exponent $\nu$ for the correlation length. Our result deviates from the Ising prediction and highlights the role of long-range dipolar interactions in 2D CrSBr. Furthermore, analyzing the divergence of the correlation length suggests the possibility of 2D-XY criticality in CrSBr in a temperature window near $T_C$ where static magnetic domains are absent. Our work provides a first demonstration of $T_2$ noise magnetometry to quantitatively analyze critical scaling behavior in 2D materials.

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