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

Manybody non-linear and coherent phenomena in optical cavities with embedded van der Waals heterostructures: The bosonic versus the fermionic regime

Principal investigators

1, Christopher Gies, Institut für Theoretische Physik, Universität Bremen [webpage]

1. Stephan Reitzenstein, Technische Universität Berlin [webpage]
2. Christian Schneider, Carl von Ossietzky Universität Oldenburg [webpage]

Abstract

We aim to deepen the understanding of the cavity-enhanced optoelectronic properties of multi-layered vdW heterostructures. Our projects’ objectives are:

• Bosonic condensation of cavity polaritons based on dipolar tunable hybrid moiré excitons in the regime of strong light-matter coupling
• Lasing and collective emission effects of hetero bi- and trilayer moiré-trapped excitons in the regime of weak light-matter coupling
• Finite temperature effects and lattice-symmetry breaking correlated phases in the extended Bose-Hubbard model
• Aspects of fermionization and atomic reconstruction: Where does fermionic nature of the building blocks of interlayer excitons shine through? What is the impact of lattice reordering at low twist angles?

Our project combines advanced nanofabrication techniques with cutting edge spectroscopy, including a low-temperature open cavity system. Experimental efforts are supported by dedicated theory work using microscopic manybody models and model Hamiltonians. We interact closely with several partner projects in the SPP, providing technological support and the advancement of theoretical methods.