Microscopic origin of period-four stripe charge density wave in the kagome metal CsV3Sb5
Yuma Murata, Rina Tazai, Youichi Yamakawa, Seiichiro Onari, Hiroshi Kontani
DOI 10.1103/4nq8-zrht · Physical Review B
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Abstract
The interplay between unconventional density waves and exotic superconductivity has attracted growing interest. Kagome superconductors AV3Sb5 (A=K,Rb,Cs) offer a platform for studying quantum phase transitions and the resulting symmetry breaking. Among these quantum phases, the 4a0 stripe charge-density wave (CDW) has been widely observed for A=Rb and Cs by scanning tunneling microscopy and nuclear magnetic resonance measurements. However, the microscopic origin of the 4a0 stripe CDW remains elusive, and no theoretical studies addressing this phenomenon have been reported so far. In this paper, we propose a microscopic mechanism for the emergence of the 4a0 stripe CDW. We analyze the CDW instability in the 12-site kagome lattice Hubbard model with the 2×2 bond order driven by the paramagnon-interference mechanism by focusing on the short-range magnetic fluctuations due to the geometrical frustration of the kagome lattice. We reveal that the nesting vector of the reconstructed Fermi surface, formed by the 2×2 bond order, gives rise to a 4a0-period CDW. Remarkably, the obtained stripe CDW is composed of both the off-site hopping integral modulations and on-site potentials. The real-space structure of the stripe CDW obtained here is in good qualitative agreement with the experimentally observed stripe pattern.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CsV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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