Publikation:

Model Prediction of Self-Rotating Excitons in Two-Dimensional Transition-Metal Dichalcogenides

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2018

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Goerbig, Mark Oliver

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Physical Review Letters. 2018, 120(18), 187401. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.120.187401

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Using the quasiclassical concept of Berry curvature we demonstrate that a Dirac exciton—a pair of Dirac quasiparticles bound by Coulomb interactions—inevitably possesses an intrinsic angular momentum making the exciton effectively self-rotating. The model is applied to excitons in two-dimensional transition metal dichalcogenides, in which the charge carriers are known to be described by a Dirac-like Hamiltonian. We show that the topological self-rotation strongly modifies the exciton spectrum and, as a consequence, resolves the puzzle of the overestimated two-dimensional polarizability employed to fit earlier spectroscopic measurements.

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ISO 690TRUSHIN, Maxim, Mark Oliver GOERBIG, Wolfgang BELZIG, 2018. Model Prediction of Self-Rotating Excitons in Two-Dimensional Transition-Metal Dichalcogenides. In: Physical Review Letters. 2018, 120(18), 187401. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.120.187401
BibTex
@article{Trushin2018-05-01Model-42253,
  year={2018},
  doi={10.1103/PhysRevLett.120.187401},
  title={Model Prediction of Self-Rotating Excitons in Two-Dimensional Transition-Metal Dichalcogenides},
  number={18},
  volume={120},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Trushin, Maxim and Goerbig, Mark Oliver and Belzig, Wolfgang},
  note={Article Number: 187401}
}
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