Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.026803
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Funding
- Research Corporation Scialog Program
- National Science Foundation at Case Western Reserve University [DMR-0349201, 0907477]
- National Science Foundation at the University of Kansas [DMR-0954486]
- Kevli Institute at Cornell for Nanoscale Science
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0907477, 0954486] Funding Source: National Science Foundation
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Exciton binding energy and excited states in monolayers of tungsten diselenide (WSe2) are investigated using the combined linear absorption and two-photon photoluminescence excitation spectroscopy. The exciton binding energy is determined to be 0.37 eV, which is about an order of magnitude larger than that in III-V semiconductor quantum wells and renders the exciton excited states observable even at room temperature. The exciton excitation spectrum with both experimentally determined one-and two-photon active states is distinct from the simple two-dimensional (2D) hydrogenic model. This result reveals significantly reduced and nonlocal dielectric screening of Coulomb interactions in 2D semiconductors. The observed large exciton binding energy will also have a significant impact on next-generation photonics and optoelectronics applications based on 2D atomic crystals.
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