Sensing chiral magnetic noise via quantum impurity relaxometry

Physical review. B./Physical review. B, vol. 102

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 $\text{spin}>1/2$ 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.

Authors 4

1. Avinash Rustagi

   Purdue University West Lafayette

   Affiliation as printed

   School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA

2. Iacopo Bertelli Aachen Huygens-Kamerlingh Onnes Laboratorium

   Leiden University · Delft University of Technology

   Affiliation as printed

   Department of Quantum Nanoscience, Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ, Delft, Netherlands

   Huygens–Kamerlingh Onnes Laboratorium, Leiden University, Niels Bohrweg 2, 2300 RA, Leiden, Netherlands

3. Toeno van der Sar

   Delft University of Technology

   Affiliation as printed

   Department of Quantum Nanoscience, Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ, Delft, Netherlands

4. Pramey Upadhyaya

   Purdue University West Lafayette

   Affiliation as printed

   Purdue Quantum Science and Engineering Institute (PQSEI), Purdue University, West Lafayette, Indiana 47907, USA

   School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA