Szczegóły publikacji
Opis bibliograficzny
Nagaoka spin-valley ordering in silicene quantum dots / Piotr JURKOWSKI, Bartłomiej SZAFRAN // Physical Review. B ; ISSN 2469-9950. — Tytuł poprz.: Physical Review B, Condensed Matter and Materials Physics ; ISSN: 1098-0121. — 2021 — vol. 103 iss. 12 art. no. 125306, s. 125306-1–125306-8. — Bibliogr. s. 125306-8. — Publikacja dostępna online od: 2021-03-23
Autorzy (2)
Dane bibliometryczne
| ID BaDAP | 133989 |
|---|---|
| Data dodania do BaDAP | 2021-06-10 |
| Tekst źródłowy | URL |
| DOI | 10.1103/PhysRevB.103.125306 |
| Rok publikacji | 2021 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Physical Review, B |
Abstract
We study a cluster of quantum dots defined within silicene that hosts confined electron states with spin and valley degrees of freedom. Atomistic tight-binding and continuum Dirac approximations are applied for a few-electron system in the quest for spontaneous valley polarization driven by interdot tunneling and an electron-electron interaction, i.e., a valley counterpart of itinerant Nagaoka ferromagnetic ordering recently identified in a GaAs square cluster of quantum dots with three excess electrons [J. P. Dehollain et al., Nature (London) 579, 528 (2020)]. We find that for a Hamiltonian without intrinsic spin-orbit coupling the valley polarization in the ground state can be observed in a range of interdot spacings provided that the spin of the system is frozen by an external magnetic field. The intervalley scattering effects are negligible for a cluster geometry that supports the valley-polarized ground state. In the presence of a strong intrinsic spin-orbit coupling that is characteristic to silicene, no external magnetic field is necessary for the observation of a ground state that is polarized in both the spin and valley. The effective magnetic field due to the spin-orbit interaction produces a perfect anticorrelation of the spin and valley isospin components in the low-energy spectrum. Experimental detection of spin-valley ground-state polarization by a charge response to a potential variation is discussed.
