Berlin 2024 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 40: 2D Materials and Heterostructures: Magnetic Properties

HL 40.3: Vortrag

Donnerstag, 21. März 2024, 10:00–10:15, EW 201

Proximity effects in the valley Zeeman physics of van der Waals heterostructures — •Paulo E. Faria Junior and Jaroslav Fabian — University of Regensburg

Proximity effects are a hallmark of van der Waals systems, providing a very efficient way to functionalize the different materials in the heterostructure. Interestingly, these proximity effects arise from the small overlap of electron densities within the van der Waals gap. In this talk, I will address how proximity effects can be observed using the valley Zeeman physics of excitons in van der Waals heterostructures. Specifically, I will focus on three different scenarios: (i) the impact of electric field and interlayer distance fluctuations to interlayer exciton g-factors in MoSe2/WSe2 heterostructures[1]; (ii) the unexpected proximity-enhanced valley Zeeman shift in WS2/graphene systems[2]; and (iii) the emergence of an asymmetric valley Zeeman shift in MoSe2/CrSBr structures[3]. [1] Faria Junior, Fabian, Nanomaterials 13, 1187 (2023). [2] Faria Junior et al., 2D Mater. 10, 03400 (2023). [3] Serati de Brito, Faria Junior et al., arXiv:2309.03766, to appear in Nano Letters (2023). Funding: DFG SFB 1277.

Keywords: Proximity effects; Valley Zeeman; Excitons; Spin-valley; Spin-orbit