Szczegóły publikacji
Opis bibliograficzny
Unconventional topological superconductivity and phase diagram for an effective two-orbital model as applied to twisted bilayer graphene / M. Fidrysiak, M. ZEGRODNIK, J. Spałek // Physical Review. B ; ISSN 2469-9950. — Tytuł poprz.: Physical Review B, Condensed Matter and Materials Physics ; ISSN: 1098-0121. — 2018 — vol. 98 iss. 8, s. 085436-1–085436-10. — Bibliogr. s. 085436-9–085436-10
Autorzy (3)
- Fidrysiak Maciej
- AGHZegrodnik Michał
- Spałek Józef
Dane bibliometryczne
| ID BaDAP | 118336 |
|---|---|
| Data dodania do BaDAP | 2018-12-12 |
| Tekst źródłowy | URL |
| DOI | 10.1103/PhysRevB.98.085436 |
| Rok publikacji | 2018 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Physical Review, B |
Abstract
We consider the superconducting and Mott-insulating states for twisted bilayer graphene, modeled as a two-narrow-band system of electrons with appreciable intra-atomic Coulomb interactions. The interaction induces kinetic exchange which leads to real space, either triplet- or singlet-spin pairing, in direct analogy to heavy fermions and high-temperature superconductors. By employing the statistically consistent Gutzwiller method, we construct explicitly the phase diagram as a function of electron concentration for the spin-triplet d(x2-y2) + id(xy) paired case, as well as determine the topological edge states. The model reproduces principal features observed experimentally in a semi-quantitative manner. The essential role of electronic correlations in driving both the Mott-insulating and superconducting transitions is emphasized. The transformation of the spin-triplet state into its spin-singlet analog is also analyzed, as well as the appearance of the phase-separated superconducting+Mott-insulating state close to the half-filling.
