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Condensed Matter > Mesoscale and Nanoscale Physics

arXiv:1601.02133 (cond-mat)
[Submitted on 9 Jan 2016 (v1), last revised 27 Sep 2016 (this version, v3)]

Title:Nano-optical imaging of WSe2 waveguide modes revealing light-exciton interactions

Authors:Z. Fei, M. E. Scott, D. J. Gosztola, J. J. Foley IV, J. Yan, D. G. Mandrus, H. Wen, P. Zhou, D. W. Zhang, Y. Sun, J. R. Guest, S. K. Gray, W. Bao, G. P. Wiederrecht, X. Xu
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Abstract:We report on nano-optical imaging study of WSe2 thin flakes with the scanning near-field optical microscopy (NSOM). The NSOM technique allows us to visualize in real space various waveguide photon modes inside WSe2. By tuning the excitation laser energy, we are able to map the entire dispersion of these waveguide modes both above and below the A exciton energy of WSe2. We found that all the modes interact strongly with WSe2 excitons. The outcome of the interaction is that the observed waveguide modes shift to higher momenta right below the A exciton energy. At higher energies, on the other hand, these modes are strongly damped due to adjacent B excitons or band edge absorptions. The mode-shifting phenomena are consistent with polariton formation in WSe2.
Comments: 19 pages, 12 figures
Subjects: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
Cite as: arXiv:1601.02133 [cond-mat.mes-hall]
  (or arXiv:1601.02133v3 [cond-mat.mes-hall] for this version)
  https://doi.org/10.48550/arXiv.1601.02133
Related DOI: https://doi.org/10.1103/PhysRevB.94.081402

Submission history

From: Zhe Fei [view email]
[v1] Sat, 9 Jan 2016 17:23:23 UTC (2,502 KB)
[v2] Sun, 17 Jul 2016 21:41:47 UTC (1,441 KB)
[v3] Tue, 27 Sep 2016 14:11:58 UTC (1,504 KB)
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