Antonio Lechiara
Effects of Doping on Stripe Order and Superconductivity in Cuprates: A Variational Monte Carlo Approach.
Rel. Luca Fausto Tocchio. Politecnico di Torino, Master of science program in Physics Of Complex Systems, 2023
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Abstract
High-temperature superconductors constitute a very special class of materials, whose puzzling properties and rich physics have caught the attention of the physicists soon after their discovery. The peculiar self-organization of the electrons into periodic structures of wavelength λ breaking the periodicities of the underlying lattice, called stripes, is found to coexist with superconducting correlations. By employing Variational Monte Carlo simulations on a single-band Hubbard model on the square lattice with both nearest-(t) and next-nearest-(t′) neighbour hopping, the present work investigates the consequences of increasing hole doping on the instauration of stripes and the behavior of the superconducting order parameter, with a particular focus on cuprate superconductors, along with a discussion on how the two phenomena affect each other.
We consider two different values of the next-nearest neighbour hopping parameter, that are appropriate for describing cuprate superconductors
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