Table 1 Ratio of \(I({A}_{1g}^{2})/I({E}_{g}^{2})\) for samples investigated with micro-Raman and TERS.

From: The effect of substrate and surface plasmons on symmetry breaking at the substrate interface of the topological insulator Bi2Te3

Substrate

\({\boldsymbol{I}}({{\boldsymbol{A}}}_{{\bf{1}}{\boldsymbol{g}}}^{{\bf{2}}})/{\boldsymbol{I}}({{\boldsymbol{E}}}_{{\boldsymbol{g}}}^{{\bf{2}}})\)

micro-Raman

TERS

Si

0.40

0.84

GaAs

2.86

3.39

Sapphire corrugated

0.38

0.49

Sapphire flat

0.34

0.55

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