SPICE Workshop on Quantum Spinoptics, June 18th - June 20th 2024
Francisco Machado
Quantum spin sensors have emerged as powerful tools for probing solid state materials owing to their large susceptibility to fluctuations in a nearby sample. This suggests that spin sensors are particularly well-suitable to study phase transitions where the characteristics of the enhanced fluctuations determine the nature of the critical point.
In this talk, I will discuss how the decoherence dynamics of a quantum spin sensor can not only identify the presence of a phase transition, but can also encode fundamental properties of its criticality. I will argue how, by analyzing a scaling collapse of the decoherence profile, one can directly extract the critical exponents of the transition and identify its universality class. In the context of quantum magnetism, our proposal complements existing techniques and provides a novel toolset optimized for interrogating two-dimensional magnetic materials.
Based on: Machado, Demler, Yao, Chatterjee PRL 131 (2023)