Anomalous Phonon Softening with Inherent Strain in Wrinkled Monolayer WSe<sub>2</sub>.

Similarly, in Figure 2c , the phonon mode shows a clear trend of frequency shifts along with tip displacement in the normalized TERS spectra, alongside other phonon modes such as E ′( K ), E ′( M ), 2LA( M ), and 3LA( M ).

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