Exciton band structure of monolayer MoS$_2$

By Fengcheng Wu, F. Qu, Allan H. MacDonald. 2015

259 citations recorded by the source corpus.

We address the properties of excitons in monolayer MoS$_2$ from a theoretical point of view, showing that low-energy excitonic states occur both at the Brillouin zone center and at the Brillouin-zone corners, that binding energies at the Brillouin-zone center deviate strongly from the $(n-1/2)^{-2}$ pattern of the two-dimensional hydrogenic model, and that the valley-degenerate exciton doublet at the Brillouin-zone center splits at finite momentum into an upper mode with non-analytic linear dispersion and a lower mode with quadratic dispersion. Although monolayer MoS$_2$ is a direct-gap semiconductor when classified by its quasiparticle band structure, it may well be an indirect gap material when classified by its excitation spectra.

Subfields: Materials Chemistry, Molecular Biology

View Paper: https://www.semanticscholar.org/paper/5893a742a47408dce9b2ffad617bf1f2f93f9138

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In Materials Chemistry

1. Fengcheng Wu
2. Lain‐Jong Li
3. Allan H. MacDonald
4. Ashvin Vishwanath
5. M. Koshino

Citations in the corpus

• Direct measurement of exciton valley coherence in monolayer WSe2 (2015, background): “The coupling constant JQ is linear in the magnitude of Q: JQ = Ry ∗ π 4 α(2)|aB ψ(0)|(2)(2 TQ/Ry ), (7)”