2018/04/09 by B. Szafran, Bartlomiej Szafran, Alina Mrenca-Kolasinska +5 · 7 citations
Materials Science · Physics and Astronomy · #Condensed matter physics #Electric field #Electron #Graphene research and applications #Physics #Quantum and electron transport phenomena #Quantum dot #Quantum mechanics #Silicene #Spin (aerodynamics) #Spin–orbit interaction #Topological Materials and Phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.97.165303
published in Physical review. B./Physical review. B 97(16) (American Physical Society)
openalex publication_date 2018/04/09 · arxiv created 2018/04/27 · arxiv updated 2018/04/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study spin control for an electron confined in a flake of silicene. We find that the lowest-energy conduction-band levels are split by the diagonal intrinsic spin-orbit coupling into Kramers doublets with a definite projection of the spin on the orbital magnetic moment. We study the spin control by AC electric fields using the nondiagonal Rashba component of the spin-orbit interactions with the time-dependent atomistic tight-binding approach. The Rashba interactions in AC electric fields produce Rabi spin-flip times of the order of a nanosecond. These times can be reduced to tens of picoseconds provided that the vertical electric field is tuned to an avoided crossing opened by the Rashba spin-orbit interaction. We demonstrate that the speedup of the spin transitions is possible due to the intervalley coupling induced by the armchair edge of the flake. The study is confronted with the results for circular quantum dots decoupled from the edge with well defined angular momentum and valley index.