Electronic instability, layer selectivity and Fermi arcs in La$_3$Ni$_2$O$_7$
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| Format: | Preprint |
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2024
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| _version_ | 1866916335765684224 |
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| author | Lechermann, Frank Bötzel, Steffen Eremin, Ilya M. |
| author_facet | Lechermann, Frank Bötzel, Steffen Eremin, Ilya M. |
| contents | Using advanced dynamical mean-field theory on a realistic level we study the normal-state correlated electronic structure of the high-pressure superconductor La$_3$Ni$_2$O$_7$ and compare the features of the conventional bilayer (2222) Ruddelsden-Popper crystal structure with those of a newly-identified monolayer-trilayer (1313) alternation. Both structural cases display Ni-$d_{z^2}$ flat-band character at low-energy, which drives an electronic instability with a wave vector ${\bf q_{\rm I}}=(0.25,0.25,q_z)$ at ambient pressure, in line with recent experimental findings. The 1313 electronic structure exhibits significant layer selectivity, rendering especially the monolayer part to be Mott-critical. At high pressure, this layer selectivity weakens and the 1313 fermiology displays arcs reminiscent to those of high-$T_c$ cuprates. In contrast to dominant inter-site self-energy effects in the latter systems, here the Fermi arcs are the result of the multiorbital and multilayer interplay within a correlated flat-band scenario. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_12831 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Electronic instability, layer selectivity and Fermi arcs in La$_3$Ni$_2$O$_7$ Lechermann, Frank Bötzel, Steffen Eremin, Ilya M. Strongly Correlated Electrons Superconductivity Using advanced dynamical mean-field theory on a realistic level we study the normal-state correlated electronic structure of the high-pressure superconductor La$_3$Ni$_2$O$_7$ and compare the features of the conventional bilayer (2222) Ruddelsden-Popper crystal structure with those of a newly-identified monolayer-trilayer (1313) alternation. Both structural cases display Ni-$d_{z^2}$ flat-band character at low-energy, which drives an electronic instability with a wave vector ${\bf q_{\rm I}}=(0.25,0.25,q_z)$ at ambient pressure, in line with recent experimental findings. The 1313 electronic structure exhibits significant layer selectivity, rendering especially the monolayer part to be Mott-critical. At high pressure, this layer selectivity weakens and the 1313 fermiology displays arcs reminiscent to those of high-$T_c$ cuprates. In contrast to dominant inter-site self-energy effects in the latter systems, here the Fermi arcs are the result of the multiorbital and multilayer interplay within a correlated flat-band scenario. |
| title | Electronic instability, layer selectivity and Fermi arcs in La$_3$Ni$_2$O$_7$ |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2403.12831 |