期刊
PHYSICAL REVIEW LETTERS
卷 123, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.096803
关键词
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资金
- ATOMOPTO project (TEAM programme of the Foundation for Polish Science - EU within the ERDFund)
- EU Graphene Flagship project [785219]
- National Science Centre, Poland [2018/31/B/ST3/02111]
- Nanofab facility of the Institut Neel, CNRS/UGA
- LNCMI-CNRS
- CREST, JST [JPMJCR15F3]
- Elemental Strategy Initiative
Monolayers of semiconducting transition metal dichalcogenides are two-dimensional direct-gap systems which host tightly bound excitons with an internal degree of freedom corresponding to the valley of the constituting carriers. Strong spin-orbit interaction and the resulting ordering of the spin-split subbands in the valence and conduction bands makes the lowest-lying excitons in WX2 (X being S or Se) spin forbidden and optically dark. With polarization-resolved photoluminescence experiments performed on a WSe2 monolayer encapsulated in a hexagonal boron nitride, we show how the intrinsic exchange interaction in combination with the applied in-plane and/or out-of-plane magnetic fields enables one to probe and manipulate the valley degree of freedom of the dark excitons.
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