Tracking electronic motion in a graphene-like bulk material
shows fast electrons in all dimensions.
(April 21, 2015) Electrons
were observed to travel in a solid at an unusually high velocity, which
remained the same independent of the electron energy. This anomalous light-like
behavior is found in special two-dimensional materials, such as graphene, but
is now realized in a three-dimensional bulk material. High-resolution
angle-resolved electron spectroscopy, stimulated by synchrotron x-ray
radiation, was used to substantiate the theoretically predicted exotic electron
structure.