Valley-exchange coupling probed by angle-resolved photoluminescence
Journal article, 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.
Author
Joshua Thompson
Chalmers, Physics, Condensed Matter and Materials Theory
Samuel Brem
Philipps University Marburg
Hanlin Fang
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Carlos Anton-Solanas
The Carl von Ossietzky University of Oldenburg
Bo Han
The Carl von Ossietzky University of Oldenburg
Hangyong Shan
The Carl von Ossietzky University of Oldenburg
Saroj Prasad Dash
2D-Tech
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Witlef Wieczorek
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Christian Schneider
The Carl von Ossietzky University of Oldenburg
Ermin Malic
Philipps University Marburg
2D-Tech
Chalmers, Physics, Condensed Matter and Materials Theory
Nanoscale Horizons
2055-6756 (ISSN) 2055-6764 (eISSN)
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Subject Categories
Atom and Molecular Physics and Optics
Other Physics Topics
Condensed Matter Physics
DOI
10.1039/d1nh00302j
PubMed
34796891