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Quantum metric-induced giant and reversible nonreciprocal transport phenomena in chiral loop-current phases of kagome metals.
| Title: | Quantum metric-induced giant and reversible nonreciprocal transport phenomena in chiral loop-current phases of kagome metals. |
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| Additional Titles: | Emergence of quantum orders with nontrivial quantum geometric properties in metals represent central issues in condensed matter physics. In this context, recently discovered chiral loop-current order in kagome metals has garnered significant attention. Particularly noteworthy is the giant electrical magnetochiral anisotropy (eMChA)observed in CsV₃Sb₅, which provides compelling evidence for the simultaneous breaking of time-reversal and inversion symmetries. However, the origin of the eMChA and its fundamental connection to the loop-current remain highly elusive, as the loop-current itself preserves inversion symmetry. Here, we demonstrate that the loop-current phase breaks inversion symmetry in the presence of the experimentally observed stripe charge-density wave, leading to finite eMChA coefficient γ[eM]. In this mechanism, γ[eM] is proportional to the product of the loop-current-induced orbital magnetization, M⁰[orb], and the lifetime of conduction electrons, τ. Therefore, γ[eM] is reversible by the magnetic fields, and it takes large value in kagome metals with τvFermi ≫ a₀ (=lattice constant). Surprisingly, the quantum metric, which defines a fundamental geometric aspect of Bloch wavefunctions, acquires significant momentum dependence in the loop-current phase, resulting in a dramatic enhancement of eMChA by ∼100 times. This research not only clarifies the fundamental symmetry-breaking states in kagome metals but also opens a path for exploring quantum metric-induced phenomena arising from exotic quantum phase transitions in various metals. |
| Authors: | Yamakawa, Youichi, Morimoto, Takahiro, Hiroshi Kontani, Tazai, Rina |
| Document Type: | Monograph |
| Physical Description: | 1 online resource |
| Index Terms: | kagome metals, loop-current order, electrical magnetochiral anisotropy (eMChA), quantum metric, Journal Article., VoR. |
| URL: | 40854118 |
| Availability: | Open access content. Open access content. embargoed access Copyright © 2025 the Author(s). Published by PNAS. This article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND). The full-text file will be made open to the public on March 02, 2026 in accordance with publisher's 'Terms and Conditions for Self-Archiving'. |
| Note: | 0027-8424. 1091-6490. Proceedings of the National Academy of Sciences (PNAS), 122(35). eng. |
| Other Numbers: | JPNII oai:irdb.nii.ac.jp:01221:0006946582 1565993775 |
| Contributing Source: | From OAIster®, provided by the OCLC Cooperative. |
| Accession Number: | edsoai.on1565993775 |
| Database: | OAIster |
| Description not available. |