Abstract
We investigate the origin of emission lines apparent in the low-temperature photoluminescence spectra of n-doped WS2 monolayer embedded in hexagonal BN layers using external magnetic fields and first-principles calculations. Apart from the neutral A exciton line, all observed emission lines are related to the negatively charged excitons. Consequently, we identify emissions due to both the bright (singlet and triplet) and dark (spin- and momentum-forbidden) negative trions as well as the phonon replicas of the latter optically inactive complexes. The semidark trions and negative biexcitons are distinguished. On the basis of their experimentally extracted and theoretically calculated g-factors, we identify three distinct families of emissions due to exciton complexes in WS2: bright, intravalley, and intervalley dark. The g-factors of the spin-split subbands in both the conduction and valence bands are also determined.
Highlights
We investigate the origin of emission lines apparent in the low-temperature photoluminescence spectra of n-doped WS2 monolayer embedded in hexagonal BN layers using external magnetic fields and first-principles calculations
Dark excitons in S-TMD M onolayers (MLs) can be divided into two subgroups because of the distinct origins of their optical inactivity, that is, intravalley spin-forbidden and intervalley momentum-forbidden complexes, which can not recombine optically due to the spin and momentum conservation rule for excitons
We investigate the low-temperature optical response of high-quality n-doped tungsten disulfide (WS2) ML encapsulated hexagonal BN flakes using photoluminescence (PL) spectroscopy in external magnetic fields
Summary
Molas − Institute of Experimental Physics, Faculty of Physics, University of Warsaw, 02-093 Warsaw, Poland; orcid.org/0000-0002-5516-9415; Email: maciej.molas@ fuw.edu.pl. Tomasz Wozń iak − Department of Semiconductor Materials Engineering, Wrocław University of Science and Technology, 50-370 Wrocław, Poland. Tomasz Kazimierczuk − Institute of Experimental Physics, Faculty of Physics, University of Warsaw, 02-093 Warsaw, Poland Piotr Kapuscinski − Laboratoire National des Champs.
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