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Characterization and control of ZnGeN2 cation lattice ordering
Eric W. Blanton, Keliang He, Jie Shan +1
ZnGeN2 and other heterovalent ternary semiconductors have important potential applications in optoelectronics, but ordering of the cation sublattice, which can affect the band gap,…
Raman study of the vibrational modes in ZnGeN2 (0001)
Eric W. Blanton, Mark Hagemann, Keliang He +3
A Raman spectroscopy study was carried out for ZnGeN2 with direction of propagation along the (0001) crystallographic direction on hexagonal single crystal platelets obtained by re…
Observation of tightly bound trions in monolayer MoS2
Kin Fai Mak, Keliang He, Changgu Lee +4
Two-dimensional (2D) atomic crystals, such as graphene and transition-metal dichalcogenides, have emerged as a new class of materials with remarkable physical properties. In contra…
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…
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…