“Quantum Impurity Sensing of Altermagnetic Order”

Quantum sensing with individual spin defects has emerged as a versatile platform to probe microscopic properties of condensed matter systems. In this talk, I will present a recent proposal fort quantum relaxometry with nitrogen-vacancy (NV) centers in diamond that can reveal the anisotropic spin dynamics of altermagnetic insulators together with their characteristic spin polarised bands. In our proposal, the distance and orientation dependent relaxation rate of a nearby quantum impurity encodes signatures of momentum space anisotropy in the spin diffusion response, a hallmark of altermagnetic order. This directional sensitivity is unprecedented in the landscape of quantum materials sensing, and it enables the distinction of altermagnets from conventional antiferromagnets via local, noninvasive measurements. Our results could spark new NV-sensing experiments on spin transport and symmetry breaking in altermagnets, and highlight the role of NV orientation to probe anisotropic phenomena in condensed matter systems.

Transmisión en vivo: www.youtube.com/c/InstitutodeCienciasFisicasUNAM

Participante: Dr. Víctor Augusto Sant'anna Valderramos Bittencourt

Institución: Instituto de Física, UNAM

Fecha y hora: Este evento terminó el Miércoles, 30 de Septiembre de 2026