Parts | Days | Selection | Search | Updates | Downloads | Help
TT: Fachverband Tiefe Temperaturen
TT 61: Correlated Electrons: 1D Theory
TT 61.3: Talk
Wednesday, March 20, 2024, 17:00–17:15, H 3010
Influence of oxygen orbitals on the pairing behavior in the Emery model for doped ladders — •Gökmen Polat and Eric Jeckelmann — Institut für Theoretische Physik, Leibniz Universität Hannover
We investigate the Emery model on ladder-like lattices including two legs of copper d-orbitals and various numbers of oxygen p-orbitals. Various periodic ladder structures are considered with unit cells CunOm with ratio n/m from 2/5 to 2/3. We calculate gaps, pair binding energy, density distribution, and pairing correlation functions on ladders with open boundary conditions using the density matrix renormalization group (DMRG). We show that the presence or absence of chain-end p-orbitals can lead to the formation of localized boundary states and strongly influences the pairing properties at low doping. More generally, the pairing behavior of finite-size ladders upon hole or electron doping depends sensitively on which p-orbitals are included and on the strength of their hybridization with the copper d-orbitals. We show that these finite-size effects play a role in the apparent failure of the Emery model for cuprate ladders that has been reported recently [1].
[1] Song et al., Phys. Rev. B 107 (2023) L241108
Keywords: Emery model; ladder; pairing; DMRG