Orateur
Description
Abstract
The interplay of the spin and the orbital angular momenta of electrons in semiconductors governs the Zeeman splitting, often described by the g-factors. In this talk, I will cover the basic physics behind the Zeeman splitting and g-factors, with recent examples involving two-
dimensional materials and related van der Waals heterostructures. Particularly, I will show that in monolayer phosphorene[1], the g-factors are driven by spin-orbit coupling, thus acquiring small corrections. In transition metal dichalcogenides (TMDCs) monolayers, I will discuss a full ab initio approach for the g-factors[2] that nicely reproduces the experimental values, demystifying the so-called valley-Zeeman physics in TMDCs and connecting it to the longstanding knowledge of g-factors in III-V materials. Using this full ab initio approach, I will discuss the effect of mechanical strain in the g-factors of monolayer TMDCs in close connection to experiments[3,4].
Beyond monolayers, I will discuss TMDC-based van der Waals heterostructures, particularly MoSe 2/WSe2 [2]and WS2/graphene systems, in which the spin-valley physics and g-factors encode valuable information about the interlayer coupling. Reaching the bulk limit of TMDCs, I will address the origin of ultrafast oscillations for in-plane magnetic fields in bulk MoSe2 and WSe2[5].
References
[1] Faria Junior, Kurpas, Gmitra, Fabian, PRB 100, 115203 (2019)
[2] Woźniak, Faria Junior, Seifert, Chaves, Kunstmann, PRB (Editors' Suggestion) 101, 235408 (2020)
[3] Covre, Faria Junior, Gordo, Brito, Zhumagulov, Teodoro, Couto Jr, Misoguti, Pratavieira, Andrade, Christianen, Fabian, Withers, Gobato, Nanoscale 14, 5758 (2022)
[4] Blundo, Faria Junior, Surrente, Pettinari, Prosnikov, Olkowska-Pucko, Zollner, Woźniak, Chaves, Kazimierczuk, Felici, Babiński, Molas, Christianen, Fabian, Polimeni, PRL (in press)
[5] Raiber, Faria Junior, Falter, Feldl, Marzena, Watanabe, Taniguchi, Fabian, Schüller, arXiv:2204.12343
