Intertwined van-Hove Singularities as a Mechanism for Loop Current Order in Kagome Metals

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Auteurs principaux: Li, Heqiu, Kim, Yong Baek, Kee, Hae-Young
Format: Preprint
Publié: 2023
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author Li, Heqiu
Kim, Yong Baek
Kee, Hae-Young
author_facet Li, Heqiu
Kim, Yong Baek
Kee, Hae-Young
contents Recent experiments on Kagome metals AV$_3$Sb$_5$ (A=Cs,Rb,K) indicated spontaneous time-reversal symmetry breaking in the charge density wave state in the absence of static magnetization. The loop current order (LCO) is proposed as its cause, but a microscopic model explaining the emergence of LCO through electronic correlations has not been firmly established. We show that the coupling between van-Hove singularities (vHS) with distinct mirror symmetries is a key ingredient to generate LCO ground state. By constructing an effective model, we find that when multiple vHS with opposite mirror eigenvalues are close in energy, the nearest-neighbor electron repulsion favors a ground state with coexisting LCO and charge bond order. It is then demonstrated that this mechanism applies to the Kagome metals AV$_3$Sb$_5$. Our findings provide an intriguing mechanism of LCO and pave the way for a deeper understanding of complex quantum phenomena in Kagome systems.
format Preprint
id arxiv_https___arxiv_org_abs_2309_03288
institution arXiv
publishDate 2023
record_format arxiv
spellingShingle Intertwined van-Hove Singularities as a Mechanism for Loop Current Order in Kagome Metals
Li, Heqiu
Kim, Yong Baek
Kee, Hae-Young
Strongly Correlated Electrons
Mesoscale and Nanoscale Physics
Recent experiments on Kagome metals AV$_3$Sb$_5$ (A=Cs,Rb,K) indicated spontaneous time-reversal symmetry breaking in the charge density wave state in the absence of static magnetization. The loop current order (LCO) is proposed as its cause, but a microscopic model explaining the emergence of LCO through electronic correlations has not been firmly established. We show that the coupling between van-Hove singularities (vHS) with distinct mirror symmetries is a key ingredient to generate LCO ground state. By constructing an effective model, we find that when multiple vHS with opposite mirror eigenvalues are close in energy, the nearest-neighbor electron repulsion favors a ground state with coexisting LCO and charge bond order. It is then demonstrated that this mechanism applies to the Kagome metals AV$_3$Sb$_5$. Our findings provide an intriguing mechanism of LCO and pave the way for a deeper understanding of complex quantum phenomena in Kagome systems.
title Intertwined van-Hove Singularities as a Mechanism for Loop Current Order in Kagome Metals
topic Strongly Correlated Electrons
Mesoscale and Nanoscale Physics
url https://arxiv.org/abs/2309.03288