Scanning tunnelling microscopy in biology Are the current carriers tunnelling electrons or hydrated protons?
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Topological transport and atomic tunnelling–clustering dynamics for aged Cu-doped Bi2Te3 crystals
Enhancing the transport contribution of surface states in topological insulators is vital if they are to be incorporated into practical devices. Such efforts have been limited by the defect behaviour of Bi2Te3 (Se3) topological materials, where the subtle bulk carrier from intrinsic defects is dominant over the surface electrons. Compensating such defect carriers is unexpectedly achieved in (Cu...
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The tunnelling current in scanning tunnelling spectroscopy (STS) is typically and often implicitly modelled by a continuous and homogeneous charge flow. If the charging energy of a single-charge quantum sufficiently exceeds the thermal energy, however, the granularity of the current becomes non-negligible. In this quantum limit, the capacitance of the tunnel junction mediates an interaction of ...
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Quantum tunnelling is a phenomenon which becomes relevant at the nanoscale and below. It is a paradox from the classical point of view as it enables elementary particles and atoms to permeate an energetic barrier without the need for sufficient energy to overcome it. Tunnelling might seem to be an exotic process only important for special physical effects and applications such as the Tunnel Dio...
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We have performed first principles calculations of the electronic properties and the magnetic order at the interface of La0.7Sr0.3MnO3 and SrTiO3. The results are analysed in order to give the strength of the exchange between the surface MnO2 layer and the bulk and also the degree of the polarization of the bands. It is shown that these properties depend on the way the interface is grown. Two d...
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In 1986, Gerd Binnig and Heinrich Rohrer won the Nobel Prize in Physics for the invention of the scanning tunnelling microscope (STM) and the fact that it could achieve atomic resolution. They observed that if they held a metallic tip of 10 angstrom above a conductive surface, they could measure a tunnelling current in the order of a nanoampere. When the tip was then scanned over the conducting...
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