Probing loop currents and collective modes of charge density waves in Kagome materials with NV centers
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2025-06-20 |
| Journal | npj Quantum Materials |
| Authors | Ying-Ming Xie, Naoto Nagaosa |
| Analysis | Full AI Review Included |
Okay, Iāll analyze the research paper and provide the requested sections in Markdown format, adhering to the specified formatting rules.
Executive Summary
Section titled āExecutive Summaryā- Investigates collective modes of charge density waves (CDWs) in Kagome materials, specifically AV3Sb5 (A = K, Rb, Cs), focusing on loop current order.
- Analyzes both real CDW (rCDW) and imaginary CDW (iCDW) order parameters using a mean-field free energy approach.
- Identifies a key distinction: phase and amplitude modes mix in iCDW, while they remain decoupled in rCDW.
- Proposes using nitrogen-vacancy (NV) centers to detect time-dependent stray fields generated by phase mode excitations in iCDW, offering a potential experimental probe for loop current order.
- The proposed method leverages the sensitivity of NV centers to magnetic noise arising from loop current fluctuations.
- Provides a theoretical framework for understanding collective excitations in iCDW and their connection to experimentally measurable quantities.
Technical Specifications
Section titled āTechnical Specificationsā| Parameter | Value THE NV CENTER IS USED TO DETECT THE MAGNETIC FIELD.
View Original Abstract
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.