First-principles calculation shows selective excitation of an IR phonon mode in La3Ni2O7 produces a small nonlinear shift that moves the Ni-O-Ni bond angle closer to 180 degrees.
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Constrained-path QMC simulations of a bilayer Hubbard model map a crossover from d-wave to s±-wave pairing driven by Hund's coupling and crystal field splitting in La3Ni2O7.
La5Ni3O11 shows layer-selective physics with the single layer near a Mott instability and the bilayer dominating low-energy states, yielding an electronic structure that closely resembles the bilayer La3Ni2O7.
Superconductivity in La3Ni2O7 arises from interlayer Cooper pairs of 3d_x2-y2 electrons driven by effective J_perp from Hund-assisted AFM exchange transfer, while localized 3d_z2 electrons form rung singlets that produce a pseudogap but no condensate.
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Optical control of the crystal structure in the bilayer nickelate superconductor La3Ni2O7 via nonlinear phononics
First-principles calculation shows selective excitation of an IR phonon mode in La3Ni2O7 produces a small nonlinear shift that moves the Ni-O-Ni bond angle closer to 180 degrees.