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Seeing many-body effects in single- and few-layer graphene: Observation of two-dimensional saddle-point excitons
Kin Fai Mak, Jie Shan, Tony F. Heinz
Significant excitonic effects were observed in graphene by measuring its optical conductivity in a broad spectral range including the two-dimensional π-band saddle-point singularit…
Imaging Stacking Order in Few-Layer Graphene
Chun Hung Lui, Zhiqiang Li, Zheyuan Chen +3
Few-layer graphene (FLG) has been predicted to exist in various crystallographic stacking sequences, which can strongly influence the electronic properties of FLG. We demonstrate a…
Thermal conductance at the graphene-SiO2 interface measured by optical pump-probe spectroscopy
Kin Fai Mak, Chun Hung Lui, Tony F. Heinz
We have examined the interfacial thermal conductance σint of single and multi-layer graphene samples prepared on fused SiO2 substrates by mechanical exfoliation of graphite. By usi…
The Atomic-scale Growth of Large-Area Monolayer Graphene on Single-Crystal Copper Substrates
L. Zhao, K. T. Rim, H. Zhou +5
We study the growth and microscopic structure of large-area graphene monolayers, grown on copper single crystals by chemical vapor deposition (CVD) in ultra-high vacuum (UHV). Usin…
Ultrafast Photoluminescence from Graphene
Chun Hung Lui, Kin Fai Mak, Jie Shan +1
Since graphene has no band gap, photoluminescence is not expected from relaxed charge carriers. We have, however, observed significant light emission from graphene under excitation…
Anomalous Lattice Vibrations of Single and Few-Layer MoS2
Changgu Lee, Hugen Yan, Louis E. Brus +3
Molybdenum disulfide (MoS2) of single and few-layer thickness was exfoliated on SiO2/Si substrate and characterized by Raman spectroscopy. The number of S-Mo-S layers of the sample…