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
Philipps-Universität Marburg
2D-Tech
Chalmers, Fysik, Kondenserad materie- och materialteori
Nanoscale Horizons
2055-6756 (ISSN) 2055-6764 (eISSN)
Vol. 7 1 77-84Graphene Core Project 3 (Graphene Flagship)
Europeiska kommissionen (EU) (EC/H2020/881603), 2020-04-01 -- 2023-03-31.
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Ämneskategorier
Atom- och molekylfysik och optik
Annan fysik
Den kondenserade materiens fysik
DOI
10.1039/d1nh00302j
PubMed
34796891