期刊
NANO LETTERS
卷 19, 期 4, 页码 2464-2471出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b00029
关键词
Rydberg exciton; tungsten diselenide; diamagnetic shift; Zeeman shift; magnetic dipole moment
类别
资金
- University of Massachusetts Amherst
- NSF [ECCS-1509599]
- US Department of Energy [DE-FG02-07ER46451]
- National Science Foundation [NSF/DMR-1157490, DMR-1644779]
- State of Florida
- CAPES
- CNPq
- PRONEX/FUNCAP
- German Research Foundation (DFG) [SE 651/45-1]
- PQ
- Polish Ministry of Science and Higher Education within Diamond Grant [D\2015 002645]
- Elemental Strategy Initiative
- CREST, JST [JPMJCR15F3]
- [NSF-CHE-1839464]
We report the experimental observation of radiative recombination from Rydberg excitons in a two-dimensional semiconductor, monolayer WSe2, encapsulated in hexagonal boron nitride. Excitonic emission up to the 4s excited state is directly observed in photoluminescence spectroscopy in an out-of-plane magnetic field up to 31 T. We confirm the progressively larger exciton size for higher energy excited states through diamagnetic shift measurements. This also enables us to estimate the is exciton binding energy to be about 170 meV, which is significantly smaller than most previous reports. The Zeeman shift of the is to 3s states, from both luminescence and absorption measurements, exhibits a monotonic increase of the g-factor, reflecting nontrivial magnetic-dipole-moment differences between ground and excited exciton states. This systematic evolution of magnetic dipole moments is theoretically explained from the spreading of the Rydberg states in momentum space.
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