15.5k citations · 25.4k across the 11 of their papers we have counts for
11 papers
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…
Experimental demonstration of continuous electronic structure tuning via strain in atomically thin MoS2
Keliang He, Charles Poole, Kin Fai Mak +1
We demonstrate the continuous tuning of the electronic structure of atomically thin MoS2 on flexible substrates by applying a uniaxial tensile strain. A redshift at a rate of ~70 m…
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…
Control of valley polarization in monolayer MoS2 by optical helicity
Kin Fai Mak, Keliang He, Jie Shan +1
Electronic and spintronic devices rely on the fact that free charge carriers in solids carry electric charge and spin, respectively. There are, however, other properties of charge…
Structurally Dependent Fano Resonances in the Infrared Spectra of Phonons in Few-Layer Graphene
Zhiqiang Li, Chun Hung Lui, Emmanuele Cappelluti +5
The in-plane optical phonons around 200 meV in few-layer graphene are investigated utilizing infrared absorption spectroscopy. The phonon spectra exhibit unusual asymmetric feature…
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…
Observation of an Electric-Field Induced Band Gap in Bilayer Graphene by Infrared Spectroscopy
Kin Fai Mak, Chun Hung Lui, Jie Shan +1
It has been predicted that application of a strong electric field perpendicular to the plane of bilayer graphene can induce a significant band gap. We have measured the optical con…