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- W4288009079 abstract "Twisted van der Waals heterostructures unravel a new platform to study strongly correlated quantum phases. The interlayer coupling in these heterostructures is sensitive to twist angles ($theta$) and key to controllably tune several exotic properties. Here, we demonstrate a systematic evolution of the interlayer coupling strength with twist angle in bilayer $mathrm{MoS_{2}}$ using a combination of Raman spectroscopy and classical simulations. At zero doping, we show a textit{monotonic} increment of the separation between the $mathrm{A_{1g}}$ and $mathrm{E^{1}_{2g}}$ mode frequencies as $theta$ decreases from $10^{circ} to 1^{circ}$, which saturates to that for a bilayer at small twist angles. Furthermore, using doping-dependent Raman spectroscopy we reveal $theta$ dependent softening and broadening of the $mathrm{A_{1g}}$ mode, whereas the $mathrm{E^{1}_{2g}}$ mode remains unaffected. Using first principles-based simulations we demonstrate large (weak) electron-phonon coupling for the $mathrm{A_{1g}}$ ($mathrm{E^{1}_{2g}}$) mode explaining the experimentally observed trends. Our study provides a non-destructive way to characterize the twist angle, the interlayer coupling and establishes the manipulation of phonons in twisted bilayer $mathrm{MoS_{2}}$ (twistnonics)." @default.
- W4288009079 created "2022-07-26" @default.
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- W4288009079 date "2019-11-30" @default.
- W4288009079 modified "2023-09-27" @default.
- W4288009079 title "Evolution of high-frequency Raman modes and their doping dependence in twisted bilayer MoS2" @default.
- W4288009079 doi "https://doi.org/10.48550/arxiv.1912.00139" @default.
- W4288009079 hasPublicationYear "2019" @default.
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