Evolution between two orbital-selective Mott phases driven by interorbital hopping

2021/12/09 by Yu Ni, Jian Sun, Ni, Yu +5
Physics and Astronomy · Materials Science · #Physics of Superconductivity and Magnetism #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials

paper · pdf · doi:10.48550/arxiv.2112.04664

Abstract

The effect of interorbital hopping on the orbital selective Mottness in a two-band correlation system is investigated by using the dynamical mean-field theory with the Lanczos method as impurity solver. We construct the phase diagram of the two-orbital Hubbard model with interorbital hopping (t₁₂), where the orbital selective Mott phases (OSMP) show different evolution trends. We find that the negative interorbital hopping (t₁₂<0) can enhance the OSMP regime upon tuning the effective bandwidth ratio. On the contrary, for the cases with positive interorbital hopping (t₁₂>0), the OSMP region becomes narrow with the increase of orbital hybridization until it disappears. It is also shown that a new OSMP emerges for a large enough positive interorbital hopping, owing to the role exchange of wide and narrow effective orbitals caused by the large t₁₂. Our results are also applicable to the hole-overdoped Ba₂CuO_4-δ superconductor, which is an orbital-selective Mott compound at half-filling.

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