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arXiv · 2610.20755

Resonant enhancement of Raman scattering in a MoS$_2$ nanotube

D. R. Kazanov·A. V. Poshakinskiy
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Abstract

The whispering-gallery modes confined in the wall of a multiwall MoS$_2$ nanotube resonantly enhance the spontaneous Raman scattering by its own optical phonons. The enhancement is doubly resonant --- pump and Stokes waves hit two adjacent modes at one pump energy, and the signal scales as $(Q_{\rm pump}Q_{\rm sc})^2$ - whenever a phonon energy matches the free spectral range of the mode ladder. Near the A exciton the excitonic dispersion compresses the ladder and sweeps its spacing through all intralayer phonon energies of MoS$_2$, so the match, reached for $A_{1g}$ at $E_{\rm pump}=1551$~meV, requires no geometric tuning. A missed match splits the excitation peak into a pump- and a scattered-resonant doublet whose splitting measures the residual detuning. Selection rules confine the double resonance to the TM$\to$TM channel and exclude $E_{1g}$.

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D. R. Kazanov, A. V. Poshakinskiy. 2026-10-14. Resonant enhancement of Raman scattering in a MoS$_2$ nanotube. https://arxiv.org/abs/2610.20755

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