Imaging relativistic electrons in graphene p-n junctions. Check it out here: http://nanotechweb.org/cws/article/tech/65483
Scanning Tunnelling Microscopy was recently highlighted in the November 2015 edition of Nature Nanotechnology. Check it out here: http://www.nature.com/nnano/journal/v10/n11/covers/index.html
Berkeley Lab researchers characterize individual defects inside a bulk insulator using scanning tunneling microscopy
Nanoscale defects are enormously important in shaping the electrical, optical, and mechanical properties of a material. For example, a defect may donate charge or scatter electrons moving from one point to another. However, observing individual defects in bulk insulators, a ubiquitous and essential component to almost all devices, has remained elusive: it’s far easier to image the detailed electrical structure of conductors than insulators. Read more…
Graphene continues to reign as the next potential superstar material for the electronics industry, a slimmer, stronger and much faster electron conductor than silicon. With no natural energy band-gap, however, graphene’s superfast conductance can’t be switched off, a serious drawback for transistors and other electronic devices. Various techniques have been deployed to overcome this problem with one of the most promising being the integration of ultrathin layers of graphene and boron nitride into two-dimensional heterostructures. As conductors, these bilayered hybrids are almost as fast as pure graphene, plus they are well-suited for making devices. However, tailoring the electronic properties of graphene boron nitride (GBN) heterostructures has been a tricky affair, involving chemical doping or electrostatic-gating – until now. Read more…
A research team led by physicists at the University of California, Riverside has identified a property of “bilayer graphene” (BLG) that the researchers say is analogous to finding the Higgs boson in particle physics.
Graphene, nature’s thinnest elastic material, is a one-atom thick sheet of carbon atoms arranged in a hexagonal lattice. Because of graphene’s planar and chicken wire-like structure, sheets of it lend themselves well to stacking.
BLG is formed when two graphene sheets are stacked in a special manner. Like graphene, BLG has high current-carrying capacity, also known as high electron conductivity. The high current-carrying capacity results from the extremely high velocities that electrons can acquire in a graphene sheet.