Manipulating light emission in van der Waals individual layers via a proximity effect

Efrat Lifshitz^a, Adi Harchol^a, Ellenor Geraffy^a, Rajesh Kumar Yadav^d^,^e, Muhamed Dawod^f, Anna Eyal^g, Yaron Amouyal^f, Thomas Brumme^h, Thomas Heine^b^,^c^,^h, Doron Naveh^d^,^e

^aSchulich Faculty of Chemistry, Solid State Institute, Russel Berrie Nanotechnology Institute, Grand Program for Energy and the Helen Diller Quantum Center, Technion-Israel Institute of Technology, Haifa 3200003, Israel

^bHelmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstr. 400, Dresden 01328, Germany

^cCenter for Advanced Systems Understanding, CASUS, Untermarkt 20, Gorlitz 02826, Germany

^dFaculty of Engineering, Bar-Ilan University, Ramat-Gan 5290002, Israel

^eInstitute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel

^fDepartment of Materials Science and Engineering, Technion-Israel Institute of Technology, Haifa 3200003, Israel

^gDepartment of Physics, Technion, Haifa 3200003, Israel

^hChair of Theoretical Chemistry, Technische Universität Dresden, Bergstrasse 66, Dresden 01069, Germany

Proceedings of Emerging Light Emitting Materials 2026 (EMLEM26)

Kallithea, Greece, 2026 September 20th - 23rd

Organizers: Grigorios Itskos and Maksym Kovalenko

Invited Speaker, Efrat Lifshitz, presentation 024
Publication date: 8th July 2026

The magnetic van der Waals (vdW) materials offers a platform to explore fundamental magnetism at the atomic limit. Transition metal phosphorus trisulfides (MPX₃) family have emerged as a keystone two-dimensional (2D) magnetic platform, possessing intrinsic ferromagnetic or antiferromagnetic properties, that persist down to a few- or a monolayer form. Within the MPX₃ family, FePS₃and NiPS₃ are the dominant examples demonstrating variable types of magnetism. FePS₃has an Ising-type antiferromagnetism (T_N ~ 118K) with out-of-plane anisotropy. NiPS₃ represents an XY-type (T_N ~ 155K) system, where spins are confined to the ab-plane. These layered systems can be isolated and reassembled into vertical heterostructures (HRs) combining members from the same family or with others (e.g., hBN, transition metal dichalcogenide). Such heterostructures provide a versatile platform for tailoring electronic, optical, and magnetic properties via proximity effects at their interfaces.

This lecture will demonstrate two most recent investigations (yet unpublished). The first example comprises NiPS₃/WSe₂ composition, prepared via dry exfoliation and stacking methodologies (including hBN capping), explored by low-temperature micro-photoluminescence (μ-PL) and magneto-PL spectroscopy. The heterostructures exhibit multiple sharp excitonic peaks emerging from localized intralayer WSe₂ excitons confined by interface-induced moiré patterns local strain. Notably, these excitons exhibit spontaneous circular polarization even in the absence of an external magnetic field, as well as nonlinear Zeeman split, signifying a magnetic proximity effect imparted by the antiferromagnetic NiPS₃ layer. Density functional theory (DFT) calculations confirmed that the PL exposed interfacial hybridization and spin texture modifications emanate from a proximity effect.

The second example describes a combination between CuCrPS₃ Fello-electric/magnetic compounds or the MnPS₃ ferrootroids with WSe₂ emitter. The ferroic layers bestow magneto-electric coupling, hence permitting manipulation of the magnetism both by magnetic and electric fields. Further on, the optical emission of the adjacent WSe₂, indirectly is tunned by the changes occurring upon a proximity effect. Hence a single photon source manipulation upon demand can be feasible. The lecture will include the motivation and preliminary results.

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