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New traffic rules in ‘Graphene City’

In the drive to find new ways to extend electronics beyond the use of silicon, physicists are experimenting with other properties of electrons, beyond charge. Physicists now describe a way to manipulate electrons based on their energy in relation to momentum — called ‘valley degree of freedom.’

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[ASAP] Codelivery of Hydrophobic and Hydrophilic Drugs by Graphene-Decorated Magnetic Dendrimers

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Langmuir
DOI: 10.1021/acs.langmuir.8b02710

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Using graphene to detect ALS, other neurodegenerative diseases

Graphene can determine whether cerebrospinal fluid comes from a person with ALS, MS or from someone without a neurodegenerative disease.

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Molecular adlayer produced by dissolving water-insoluble graphene in water

Using ‘molecular containers’ that encapsulate water-insoluble molecules, researchers developed a formation procedure for a nanographene adlayer, a layer that chemically interacts with the underlying substance, by just mixing the molecular containers and nanographene together in water.

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Using graphene to detect ALS, other neurodegenerative diseases

Graphene can determine whether cerebrospinal fluid comes from a person with ALS, MS or from someone without a neurodegenerative disease.

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Photonic crystals for nano-light in moire graphene superlattices

Graphene is an atomically thin plasmonic medium that supports highly confined plasmon polaritons, or nano-light, with very low loss. Electronic properties of graphene can be drastically altered when it is laid upon another graphene layer, resulting in a moiré superlattice. The relative twist angle between the two layers is a key tuning parameter of the interlayer coupling in thus-obtained twisted bilayer graphene (TBG). We studied the propagation of plasmon polaritons in TBG by infrared nano-imaging. We discovered that the atomic reconstruction occurring at small twist angles transforms the TBG into a natural plasmon photonic crystal for propagating nano-light. This discovery points to a pathway for controlling nano-light by exploiting quantum properties of graphene and other atomically layered van der Waals materials, eliminating the need for arduous top-down nanofabrication.

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A valley valve and electron beam splitter

Developing alternative paradigms of electronics beyond silicon technology requires the exploration of fundamentally new physical mechanisms, such as the valley-specific phenomena in hexagonal two-dimensional materials. We realize ballistic valley Hall kink states in bilayer graphene and demonstrate gate-controlled current transmission in a four-kink router device. The operations of a waveguide, a valve, and a tunable electron beam splitter are demonstrated. The valley valve exploits the valley-momentum locking of the kink states and reaches an on/off ratio of 8 at zero magnetic field. A magnetic field enables a full-range tunable coherent beam splitter. These results pave a path to building a scalable, coherent quantum transportation network based on the kink states.

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Steering electrons in graphene

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New traffic rules in ‘Graphene City’

Topological control of electrons means future electronic roadways are now possible.

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[ASAP] Graphene Oxide Quantum Dot Alters Amyloidogenicity of Hen Egg White Lysozyme via Modulation of Protein Surface Character

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Langmuir
DOI: 10.1021/acs.langmuir.8b02674

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