Abstract
We have experimentally determined the energies of the ground and first four excited excitonic states of the fundamental optical transition in monolayer WS_{2}, a model system for the growing class of atomically thin two-dimensional semiconductor crystals. From the spectra, we establish a large exciton binding energy of 0.32 eV and a pronounced deviation from the usual hydrogenic Rydberg series of energy levels of the excitonic states. We explain both of these results using a microscopic theory in which the nonlocal nature of the effective dielectric screening modifies the functional form of the Coulomb interaction. These strong but unconventional electron-hole interactions are expected to be ubiquitous in atomically thin materials.
Keywords
Rydberg formulaExcitonExcited stateBinding energyPhysicsSeries (stratigraphy)CoulombSpectral lineEnergy (signal processing)MonolayerAtomic physicsCondensed matter physicsMaterials scienceElectronQuantum mechanicsNanotechnologyIonizationIon
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Publication Info
- Year
- 2014
- Type
- article
- Volume
- 113
- Issue
- 7
- Pages
- 076802-076802
- Citations
- 2328
- Access
- Closed
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Cite This
Alexey Chernikov,
Timothy C. Berkelbach,
Heather M. Hill
et al.
(2014).
Exciton Binding Energy and Nonhydrogenic Rydberg Series in Monolayer <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>WS</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>.
Physical Review Letters
, 113
(7)
, 076802-076802.
https://doi.org/10.1103/physrevlett.113.076802
Identifiers
- DOI
- 10.1103/physrevlett.113.076802