In connection with recent tera-Hertz photoexcitation experiments in which strongly correlated materials are changed from Mott-insulating to metallic, we statically study the properties of excited states beyond the Mott gap in the -wave superconducting (d-SC) branch at half filling, by applying a variational Monte Carlo method to a two-dimensional Hubbard model. It is found that the first-order Mott transition previously found at U = U c for the lowest-energy state vanishes for the excited states. As a result, an insulator-to-d-SC transition occurs as the strength of excitation (corresponding to light intensity) is increased for U/t (> U c /t) fixed. As a mechanism, this conduction is led by newly created free carriers (unbound doublons and holons) in the excited states.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 2020 Jul 31|
|Event||32nd International Symposium on Superconductivity, ISS 2019 - Kyoto, Japan|
Duration: 2019 Dec 3 → 2019 Dec 5
ASJC Scopus subject areas
- Physics and Astronomy(all)