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- W4386875475 abstract "The parent compound of cuprates is a charge-transfer-type Mott insulator with strong hybridization between the Cu $3d_{mathrm x^2-y^2}$ and O $2p$ orbitals. A key question concerning the pairing mechanism is the behavior of doped holes in the antiferromagnetic (AF) Mott insulator background, which is a prototypical quantum many-body problem. It was proposed that doped hole on the O site tends to form a singlet, known as Zhang-Rice singlet (ZRS), with the unpaired Cu spin. But experimentally little is known about the properties of a single hole and the interplay between them that leads to superconductivity. Here we use scanning tunneling microscopy to visualize the electronic states in hole-doped $mathrm{Ca_2CuO_2Cl_2}$, aiming to establish the atomic-scale local basis for pair formation. A single doped hole is shown to have an in-gap state and a clover-shaped spatial distribution that can be attributed to a localized ZRS. When the dopants are close enough, they develop delocalized molecular orbitals with characteristic stripe- and ladder-shaped patterns, accompanied by the opening of a small gap around the Fermi level ($E_{mathrm F}$). With increasing doping, the molecular orbitals proliferate in space and gradually form densely packed plaquettes, but the stripe and ladder patterns remain nearly the same. The low-energy electronic states of the molecular orbitals are intimately related to the local pairing properties, thus play a vitally important role in the emergence of superconductivity. We propose that the Cooper pair is formed by two holes occupying the stripe-like molecular orbital, while the attractive interaction is mediated by the AF spin background." @default.
- W4386875475 created "2023-09-20" @default.
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- W4386875475 date "2023-09-17" @default.
- W4386875475 modified "2023-09-27" @default.
- W4386875475 title "Visualizing the Zhang-Rice singlet, molecular orbitals and pair formation in cuprate" @default.
- W4386875475 doi "https://doi.org/10.48550/arxiv.2309.09260" @default.
- W4386875475 hasPublicationYear "2023" @default.
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