Journal
PHYSICAL REVIEW LETTERS
Volume 115, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.176801
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Funding
- Theory Program
- U.S. Department of Energy [DE-AC02-05CH11231]
- National Science Foundation [DMR15-1508412, ACI-1053575]
- NSF Graduate Research Fellowship [DGE 1106400]
- Office of Science of the U.S. Department of Energy
- Extreme Science and Engineering Discovery Environment (XSEDE)
- Direct For Mathematical & Physical Scien [1508412] Funding Source: National Science Foundation
- Division Of Materials Research [1508412] Funding Source: National Science Foundation
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Exciton dispersion as a function of center-of-mass momentum Q is essential to the understanding of exciton dynamics. We use the ab initio GW-Bethe-Salpeter equation method to calculate the dispersion of excitons in monolayer MoS2 and find a nonanalytic lightlike dispersion. This behavior arises from an unusual vertical bar Q vertical bar-term in both the intra- and intervalley exchange of the electron-hole interaction, which concurrently gives rise to a valley quantum phase of winding number two. A simple effective Hamiltonian to Q(2) order with analytic solutions is derived to describe quantitatively these behaviors.
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