Calculates the spectral density as a function of the transverse momentum quantum number in a ballistic superconductor-graphene-superconductor junction.
In 2004 physicists from University of Manchester and Institute for Microelectronics Technology, Chernogolovka, Russia, found a way to isolate individual graphene planes by peeling them off from graphite with Scotch tape. They also measured electronic properties of the obtained flakes and showed their fantastic quality.
Carbon nanostructures such as fullerenes and carbon nanotubes have been at the forefront of materials science for over two decades. Graphene with its two-dimensional honeycomb structure and
linear low-energy electron dispersion exhibits a host of interesting chemical and physical properties such as the quantum Hall effect and Klein tunneling, combined with a variety of possible
applications ranging from single molecule sensing to high electron mobility transistors. The
chemical modification of graphene through the addition of functional groups can lead to graphene
The Zitterbewegung (ZB) was first regarded as a relativistic effect rooted in the Dirac equation and related to a ‘trembling’ or oscillatory motion of the center of a free wave packet. The ZB is caused by the interference between the positive and negative energy states in the wave packet; the characteristic frequency of this motion is determined by the gap between the two states.
Graphene can be considered as an infinite diameter carbon nanotube, or as an infinitely large aromatic molecule, the limiting case of the family of flat polycyclic aromatic hydrocarbons (PAH) or perhaps a single sheet of graphite. For many years graphene was only considered as a hypothetical limit, the theoreticians' tool in determining physical properties of carbon nanotubes or other systems.
The recent paper of the researchers of Helmholtz-Zentrum Berlin für Materialien und Energie confirmed the predictions of our group. The hedgehog and the anti-hedgehog had already been present in the previously realized graphene systems. However, they were inseparably superimposed. Only by breaking of the sublattice symmetry, the hedgehog could be separated from the anti-hedgehog.
They also measured electronic properties of the obtained flakes and showed their fantastic quality.
relativistic effect rooted in the Dirac equation and related to a ‘trembling’ or oscillatory motion of the center of a free wave packet. The ZB is caused by the interference between the positive and negative energy states in the wave packet; the characteristic frequency of this motion is determined by the gap between the two states.
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