Interference dislocations adjacent to emission spot

TL;DR

This paper investigates interference dislocations near emission spots in exciton emissions from monolayer TMDs and heterostructures, attributing their appearance to moiré effects in combined interference patterns.

Contribution

It demonstrates that adjacent interference dislocations are caused by moiré effects in combined interference patterns of emission spots.

Findings

Interference dislocations are observed in exciton emissions.

Moiré effects cause adjacent interference dislocations.

Dislocations appear in various spatially modulated emission patterns.

Abstract

We studied interference dislocations (forks) adjacent to an emission spot in an interference pattern. The adjacent interference dislocations are observed in emission of excitons in a monolayer transition metal dichalcogenide and in emission of spatially indirect excitons, also known as interlayer excitons, in a van der Waals heterostructure. The simulations show that the adjacent interference dislocations appear due to the moir\'e effect in combined interference patterns produced by constituting parts of the emission spot. The adjacent interference dislocations can appear in interference images for various spatially modulated emission patterns.