Insulator-to-superconductor transition by exciting half-filled d-wave pairing state beyond Mott gap

Hisatoshi Yokoyama, Kenji Kobayashi, Tsutomu Watanabe, Masao Ogata

Research output: Contribution to journalConference articlepeer-review

Abstract

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.

Original languageEnglish
Article number012016
JournalJournal of Physics: Conference Series
Volume1590
Issue number1
DOIs
Publication statusPublished - 2020 Jul 31
Event32nd International Symposium on Superconductivity, ISS 2019 - Kyoto, Japan
Duration: 2019 Dec 32019 Dec 5

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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