Valley-exchange coupling probed by angle-resolved photoluminescence
Artikel i vetenskaplig tidskrift, 2022

The optical properties of monolayer transition metal dichalcogenides are dominated by tightly-bound excitons. They form at distinct valleys in reciprocal space, and can interact via the valley-exchange coupling, modifying their dispersion considerably. Here, we predict that angle-resolved photoluminescence can be used to probe the changes of the excitonic dispersion. The exchange-coupling leads to a unique angle dependence of the emission intensity for both circularly and linearly-polarised light. We show that these emission characteristics can be strongly tuned by an external magnetic field due to the valley-specific Zeeman-shift. We propose that angle-dependent photoluminescence measurements involving both circular and linear optical polarisation as well as magnetic fields should act as strong verification of the role of valley-exchange coupling on excitonic dispersion and its signatures in optical spectra.

Författare

Joshua Thompson

Chalmers, Fysik, Kondenserad materie- och materialteori

Samuel Brem

Philipps-Universität Marburg

Hanlin Fang

Chalmers, Mikroteknologi och nanovetenskap, Kvantteknologi

Carlos Anton-Solanas

Carl von Ossietzky Universität Oldenburg

Bo Han

Carl von Ossietzky Universität Oldenburg

Hangyong Shan

Carl von Ossietzky Universität Oldenburg

Saroj Prasad Dash

2D-Tech

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Witlef Wieczorek

Chalmers, Mikroteknologi och nanovetenskap, Kvantteknologi

Christian Schneider

Carl von Ossietzky Universität Oldenburg

Ermin Malic

Chalmers, Fysik, Kondenserad materie- och materialteori

Philipps-Universität Marburg

2D-Tech

NANOSCALE HORIZONS

2055-6756 (ISSN) 2055-6764 (eISSN)

Vol. 7 1 77-84

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Ämneskategorier

Atom- och molekylfysik och optik

Annan fysik

Den kondenserade materiens fysik

DOI

10.1039/d1nh00302j

PubMed

34796891

Mer information

Senast uppdaterat

2022-10-10