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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…
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…
Atomically thin MoS2: A new direct-gap semiconductor
Kin Fai Mak, Changgu Lee, James Hone +2
The electronic properties of ultrathin crystals of molybdenum disulfide consisting of N = 1, 2, ... 6 S-Mo-S monolayers have been investigated by optical spectroscopy. Through char…
Electronic Structure of Few-Layer Graphene: Experimental Demonstration of Strong Dependence on Stacking Sequence
Kin Fai Mak, Jie Shan, Tony F. Heinz
The electronic structure of few-layer graphene (FLG) samples with crystalline order was investigated experimentally by infrared absorption spectroscopy for photon energies ranging…