Coherent Electronic Coupling in Atomically Thin MoSe2

Akshay Singh; Galan Moody; Sanfeng Wu; Yanwen Wu; Nirmal J. Ghimire; Jiaqiang Yan; David G. Mandrus; Xiaodong Xu; Xiaoqin Li

doi:10.1103/PhysRevLett.112.216804

Coherent Electronic Coupling in Atomically Thin MoSe2

Mesoscale and Nanoscale Physics 2014-09-30 v1

Authors: Akshay Singh , Galan Moody , Sanfeng Wu , Yanwen Wu , Nirmal J. Ghimire , Jiaqiang Yan , David G. Mandrus , Xiaodong Xu , Xiaoqin Li

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Abstract

We report the first direct spectroscopic evidence for coherent electronic coupling between excitons and trions in atomically thin transition metal dichalcogenides, specifically monolayer MoSe2. Signatures of coupling appear as isolated cross-peaks in two-color pump-probe spectra, and the lineshape of the peaks reveals that the coupling originates from many-body interactions. Excellent agreement between the experiment and density matrix calculations suggests the formation of a correlated exciton-trion state due to their coupling.

Keywords

excitonic physics in transition metal dichalcogenides excitons in semiconductors electronic structure

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@article{arxiv.1401.2909,
  title  = {Coherent Electronic Coupling in Atomically Thin MoSe2},
  author = {Akshay Singh and Galan Moody and Sanfeng Wu and Yanwen Wu and Nirmal J. Ghimire and Jiaqiang Yan and David G. Mandrus and Xiaodong Xu and Xiaoqin Li},
  journal= {arXiv preprint arXiv:1401.2909},
  year   = {2014}
}

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5 pages, 3 figures

Coherent Electronic Coupling in Atomically Thin MoSe2

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