2D Materials – Physics of
van der Waals [hetero]structures

Advanced van der Waals heterostructures with magnetic and ferroelectric components

Principal investigators

1. Tobias Korn, University of Rostock [webpage]
2. Christian Schüller, University of Regensburg [webpage]

Abstract

We aim to achieve new levels of control over excitons in van der Waals (vdW) heterostructures (HS). We will study intralayer excitons in transition metal dichalcogenides (TMDCs) and interlayer excitons (IX) in HS of different TMDCs.

As control levers, we will introduce additional functional layers. On one hand, these will be various layered magnetic materials. These can, for example, introduce Zeeman splitting via magnetic proximity effects.

On the other hand, we will utilize 3R-stacked MoS2, which is an interfacial ferroelectric material that can, both, host IX directly, and provide a ferroelectric potential landscape for excitons in more complex vdW HS.

We will utilize a variety of spectroscopy techniques such as imaging micro-photoluminescence for tracking exciton diffusion and two-color Kerr rotation for layer-selective excitation and probing of dynamics. Samples will be prepared with advanced fabrication techniques such as hot pickup and deterministic transfer in inert environment.