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Observation of interlayer phonon modes in van der Waals heterostructures
Chun Hung Lui, Zhipeng Ye, Chao Ji +9
We have investigated the vibrational properties of van der Waals heterostructures of monolayer transition metal dichalcogenides (TMDs), specifically MoS2/WSe2 and MoSe2/MoS2 hetero…
Stacking-dependent shear modes in trilayer graphene
Chun Hung Lui, Zhipeng Ye, Courtney Keiser +2
We observed distinct interlayer shear mode Raman spectra for trilayer graphene with ABA and ABC stacking order. There are two rigid-plane shear-mode phonon branches in trilayer gra…
Temperature-activated layer-breathing vibrations in few-layer graphene
Chun Hung Lui, Zhipeng Ye, Courtney Keiser +2
We investigated the low-frequency Raman spectra of freestanding few-layer graphene (FLG) at varying temperatures (400 - 900 K) controlled by laser heating. At high temperature, we…
Semiconducting-to-metallic photoconductivity crossover and temperature-dependent Drude weight in graphene
A. J. Frenzel, C. H. Lui, Y. C. Shin +2
We investigated the transient photoconductivity of graphene at various gate-tuned carrier densities by optical-pump terahertz-probe spectroscopy. We demonstrated that graphene exhi…