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Drastic magnetic-field-induced chiral current order and emergent current-bond-field interplay in kagome metals
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abstract
In kagome metals, the chiral current order $\eta$ with time-reversal-symmetry-breaking is the source of various exotic electronic states, while the method of controlling the current order and its interplay with the star-of-David bond order $\phi$ are still unsolved. Here, we reveal that tiny uniform orbital magnetization $M[\eta,\phi]$ is induced by the chiral current order, and its magnitude is prominently enlarged under the presence of the bond order. Importantly, we derive the magnetic-field ($h$)-induced Ginzburg-Landau free energy expression $\Delta F[h,\eta,\phi]$, which enables us to elucidate the field-induced current-bond phase transitions in kagome metals. The emergent current-bond-$h$ trilinear coupling term in the free energy, $-3m_1 h\eta\phi$, naturally explains the characteristic magnetic field sensitive electronic states in kagome metals, such as the field-induced current order and the strong interplay between the bond and current orders. Furthermore, we present a natural explanation for the drastic strain-induced increment of the current order transition temperature T_{TRSB} reported by a recent experiment.
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Long-range electron coherence in Kagome metals
A Kagome metal exhibits h/e flux-periodic magnetoresistance oscillations at temperatures and length scales far beyond the single-particle mean free path, pointing to interaction-stabilized coherence.
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