Dresden 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

SYSD: Symposium SKM Dissertation Prize 2020

SYSD 1: SKM Dissertation Prize

SYSD 1.6: Hauptvortrag

Montag, 16. März 2020, 11:35–12:00, HSZ 02

Exciton spectroscopy of van der Waals heterostructures — •Philipp Nagler — University of Regensburg, 93040 Regensburg, Germany

Heterostructures represent one of the most important concepts of solid-state physics. The observation of various fundamental physical phenomena along with several technological breakthroughs in the last decades can be traced back to this principle.

Recently, the notion of the heterostructure was significantly expanded by the discovery of atomically thin van der Waals crystals with different functionalities such as graphene or MoS₂. Those materials can be used as building blocks for the deterministic fabrication of heterostructures in the ultimate thickness limit, so-called van der Waals heterostructures.

Here, we employ optical spectroscopy to shed light on the rich physics of excitons in van der Waals heterostructures. Using a tailor-made WSe₂/MoSe₂ heterostructure, we demonstrate the emergence of spatially indirect interlayer excitons with ultra-long lifetimes. We further show that the twist angle, as a new degree of freedom, can be harnessed to engineer hitherto inaccessible optical transitions in momentum space. Finally, we unravel the complex hybrid composition of biexcitons in an hBN/WS₂/hBN system, opening up new avenues for the study of many-body systems in the two-dimensional limit.