Szczegóły publikacji
Opis bibliograficzny
Mixed singlet-triplet superconducting state within the moiré t-J-U model applied to twisted bilayer $WSe_2$ / M. ZEGRODNIK, A. BIBORSKI // Physical Review. B ; ISSN 2469-9950. — Tytuł poprz.: Physical Review B, Condensed Matter and Materials Physics ; ISSN: 1098-0121. — 2023 — vol. 108 iss. 6, s. 064506-1–064506-9. — Bibliogr. s. 064506-9, Abstr. — Publikacja dostępna online od: 2023-08-10
Autorzy (2)
Dane bibliometryczne
| ID BaDAP | 148248 |
|---|---|
| Data dodania do BaDAP | 2023-09-15 |
| Tekst źródłowy | URL |
| DOI | 10.1103/PhysRevB.108.064506 |
| Rok publikacji | 2023 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Physical Review, B |
Abstract
We analyze an analog of the t-J-U model as applied to the description of a single moiré flat band of twisted WSe2 bilayer. To take into account the correlation effects induced by a significant strength of the Coulomb repulsion, we use the Gutzwiller approach and compare it with the results obtained by the Hartree-Fock method. We discuss in detail the graduate appearance of a two-dome structure of the superconducting state in the phase diagram by systematically increasing the Coulomb repulsion integral U. The two superconducting domes residing on both sides of a Mott insulating state can be reproduced for a realistic parameter range, in agreement with the available experimental data. According to our analysis, the paired state has a highly unconventional character with a mixed d+id (singlet) and p-ip (triplet) symmetry. Both components of the mixed paired state are of comparable amplitudes. However, as shown here, a transition between pure singlet and pure triplet pairing should be possible in the considered system by tuning the top and bottom gate voltage, which controls the magnitude of valley-dependent spin splitting in the system. © 2023 American Physical Society.
