High‐Speed Optoelectronic Graphene Sampler at 1.55 µm Reaching Intrinsic Performances

Focusing on energy and optoelectronic applications: a journey for graphene and graphene oxide at large scale.

Carbon is the only element that has stable allotropes in the 0th through the 3rd dimension, all of which have many outstanding properties. Graphene is the basic building block of other important carbon allotropes. Studies of graphene became much more active after the Geim group isolated "free" and "perfect" graphene sheets and demonstrated the unprecedented electronic properties of graphene in ...

Extrinsic and intrinsic charge trapping at the graphene/ferroelectric interface.

The interface between graphene and the ferroelectric superlattice PbTiO3/SrTiO3 (PTO/STO) is studied. Tuning the transition temperature through the PTO/STO volume fraction minimizes the adorbates at the graphene/ferroelectric interface, allowing robust ferroelectric hysteresis to be demonstrated. "Intrinsic" charge traps from the ferroelectric surface defects can adversely affect the graphene c...

Superconductivity at 155 K

Transition to a superconducting zero-resistance state at 155 K is observed for the first time in bulk material. A new five-element compound has been synthesized with nominal composition YIBa2Cu3F20y. Fluorine plays a critical role in achieving this eAect. X-ray diffraction and electron microprobe analysis indicate that the samples are multiphasic. Evidence is presented that the samples contain ...

Heavy Vehicle Rollover Propensity At Roundabouts On Highspeed Roads

Galaxy Counts at 450 Μm and 850 Μm

Surveys of the distant Universe have been made using the SCUBA submillimeter(submm)-wave camera at the JCMT. 450and 850μm data is taken simultaneously by SCUBA in the same 5-arcmin2 field. Deep 850-μm counts of high-redshift dusty galaxies have been published; however, at 450 μm both the atmospheric transmission and antenna efficiency are lower, and the atmospheric noise is higher, and so only ...