Probing Loop Currents and Collective Modes of Charge Density Waves in Kagome Materials with NV Centers

2025/04/19 by Xie, Ying-Ming, Nagaosa, Naoto · 2 citations
#FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Strongly Correlated Electrons (cond-mat.str-el)

paper · doi:10.48550/arxiv.2504.14166

Abstract

Recently, the unconventional charge density wave (CDW) order with loop currents has attracted considerable attention in the Kagome material family AV₃Sb₅ (A = K, Rb, Cs). However, experimental signatures of loop current order remain elusive. In this work, based on the mean-field free energy, we analyze the collective modes of unconventional CDW order in a Kagome lattice model. Furthermore, we point out that phase modes in the imaginary CDW (iCDW) order with loop current orders result in time-dependent stray fields. We thus propose using nitrogen-vacancy (NV) centers to detect these time-dependent stray fields, providing a potential experimental approach to identifying loop current order.

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