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Torsional Periodic Lattice Distortions and Diffraction of Twisted 2D Materials
Suk Hyun Sung, Yin Min Goh, Hyobin Yoo +12
Twisted 2D materials form complex moiré structures that spontaneously reduce symmetry through picoscale deformation within a mesoscale lattice. We show twisted 2D materials contain…
Imaging Polarity in Two Dimensional Materials by Breaking Friedel's Law
Pratiti Deb, Michael C. Cao, Yimo Han +5
Friedel's law guarantees an inversion-symmetric diffraction pattern for thin, light materials where a kinematic approximation or a single-scattering model holds. Typically, breakin…
Stacking, Strain, & Twist in 2D Materials Quantified by 3D Electron Diffraction
Suk Hyun Sung, Noah Schnitzer, Lola Brown +2
The field of two-dimensional (2D) materials has expanded to multilayered systems where electronic, optical, and mechanical properties change-often dramatically-with stacking order,…
Spatiotemporal Mapping of Photocurrent in a Monolayer Semiconductor Using a Diamond Quantum Sensor
Brian B. Zhou, Paul C. Jerger, Kan-Heng Lee +4
The detection of photocurrents is central to understanding and harnessing the interaction of light with matter. Although widely used, transport-based detection averages over spatia…
Deep sub-Ångstrom imaging of 2D materials with a high dynamic range detector
Yi Jiang, Zhen Chen, Yimo Han +9
Aberration-corrected optics have made electron microscopy at atomic-resolution a widespread and often essential tool for nanocharacterization. Image resolution is dominated by beam…
Coherent Atomically-Thin Superlattices with Engineered Strain
Saien Xie, Lijie Tu, Yimo Han +7
Epitaxy forms the basis of modern electronics and optoelectronics. We report coherent atomically-thin superlattices, in which different transition metal dichalcogenide monolayers--…
Absence of a Band Gap at Interface of a Metal and Highly Doped Monolayer
Alexander Kerelsky, Ankur Nipane, Drew Edelberg +9
High quality electrical contact to semiconducting transition metal dichalcogenides (TMDCs) such as is key to unlocking their unique electronic and optoelectronic properties…
Transient absorption and photocurrent microscopy show hot electron supercollisions describe the rate-limiting relaxation step in graphene
Matt W. Graham, Su-Fei Shi, Zenghui Wang +3
Using transient absorption (TA) microscopy as a hot electron thermometer we show disorder-assisted acoustic-phonon supercollisions (SCs) best describes the rate-limiting relaxation…
Oxidation resistance of graphene-coated Cu and Cu/Ni alloy
Shanshan Chen, Lola Brown, Mark Levendorf +9
The ability to protect refined metals from reactive environments is vital to many industrial and academic applications. Current solutions, however, typically introduce several nega…
Imaging Grains and Grain Boundaries in Single-Layer Graphene: An Atomic Patchwork Quilt
Pinshane Y. Huang, Carlos S. Ruiz-Vargas, Arend M. van der Zande +8
The properties of polycrystalline materials are often dominated by the size of their grains and by the atomic structure of their grain boundaries. These effects should be especiall…
Electrically Driven Light Emission from Individual CdSe Nanowires
Yong-Joo Doh, Kristin N. Maher, Lian Ouyang +3
We report electroluminescence (EL) measurements carried out on three-terminal devices incorporating individual n-type CdSe nanowires. Simultaneous optical and electrical measuremen…
Photocurrent Imaging of p-n Junctions and Local Defects in Ambipolar Carbon Nanotube Transistors
Y. H. Ahn, Wei Tsen, Bio Kim +2
We use scanning photocurrent microscopy (SPCM) to investigate the properties of internal p-n junctions as well as local defects in ambipolar carbon nanotube (CNT) transistors. Our…