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Full-Text Articles in Physics
Observation Of Interlayer Phonon Modes In Van Der Waals Heterostructures, C. H. Lui, Zhipeng Ye, Chao Ji, Kuan-Chang Chiu, Cheng-Tse Chou, Trond I. Andersen, Casie Means-Shively, Heidi Anderson, Jenn-Ming Wu, Tim Kidd, Yi-Hsien Lee, Rui He
Observation Of Interlayer Phonon Modes In Van Der Waals Heterostructures, C. H. Lui, Zhipeng Ye, Chao Ji, Kuan-Chang Chiu, Cheng-Tse Chou, Trond I. Andersen, Casie Means-Shively, Heidi Anderson, Jenn-Ming Wu, Tim Kidd, Yi-Hsien Lee, Rui He
Faculty Publications
We have investigated the vibrational properties of van der Waals heterostructures of monolayer transition metal dichalcogenides (TMDs), specifically MoS2/WSe2 and MoSe2/MoS2 heterobilayers and twisted MoS2 bilayers, by means of ultralow-frequency Raman spectroscopy. We discovered Raman features (at 30–40 cm−1) that arise from the layer-breathing mode (LBM) vibration between the two incommensurate TMD monolayers in these structures. The LBM Raman intensity correlates strongly with the suppression of photoluminescence that arises from interlayer charge transfer. The LBM is generated only in bilayer areas with direct layer-layer contact and an atomically clean interface. Its frequency also …
Manipulation Of Subsurface Carbon Nanoparticles In Bi2sr2cacu2o8+Δ Using A Scanning Tunneling Microscope, A. J. Stollenwerk, N. Hurley, B. Beck, K. Spurgeon, Tim Kidd, G. Gu
Manipulation Of Subsurface Carbon Nanoparticles In Bi2sr2cacu2o8+Δ Using A Scanning Tunneling Microscope, A. J. Stollenwerk, N. Hurley, B. Beck, K. Spurgeon, Tim Kidd, G. Gu
Faculty Publications
We present evidence that subsurface carbon nanoparticles in Bi2Sr2CaCu2O8+δ can be manipulated with nanometer precision using a scanning tunneling microscope. High-resolution images indicate that most of the carbon particles remain subsurface after transport observable as a local increase in height as the particle pushes up on the surface. Tunneling spectra in the vicinity of these protrusions exhibit semiconducting characteristics with a band gap of approximately 1.8 eV, indicating that the incorporation of carbon locally alters the electronic properties near the surface.