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Real-Space Loop Current Pattern in Time-Reversal-Symmetry Breaking Phase in Kagome Metals

K. Shimura, R. Tazai, Y. Yamakawa, S. Onari, and H. Kontani, J. Phys. Soc. Jpn. 93, 033704 (20224). Published February 27, 2024

The charge loop current (cLC) state has attracted increasing attention in kagome metals. Here, we calculate the currents along the nearest sites i and j, Ji,j, induced by the cLC order that is the imaginary and odd-parity hopping integral modulation δti,j. We reveal that the magnitude of Ji,j strongly depends on the nearest sites i and j in the 2 × 2 cLC state, where η ≡ |δti,j| is equivalent for all nearest sites. The obtained Ji,j becomes large near the van-Hove singularity (vHS) filling (n ∼ nvHS) even when η is fixed. Interestingly, the obtained Ji,j exhibits the logarithmic divergence behavior at low temperatures for n ∼ nvHS with a fixed η, by reflecting the vHS points that are the characteristic of kagome metals. The present study provides useful information for local electronic state measurements, such as the site-selective NMR and STM experiments.

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