Superconductivity in Nanowires: Fabrication and Quantum by Alexey Bezryadin

By Alexey Bezryadin

The significance and reality of nanotechnology is unabated and may be for years yet to come. a chief problem is to appreciate many of the houses of yes nanostructures, and the way to generate buildings with particular houses to be used in real purposes in electric Engineering and Medicine.

essentially the most vital buildings are nanowires, particularly superconducting ones. they're hugely promising for destiny electronics, transporting present with out resistance and at scales of some nanometers. to manufacture wires to yes outlined criteria in spite of the fact that, is a tremendous problem, and so is the research and figuring out of those houses within the first position. A promising method is to exploit carbon nanotubes in addition to DNA buildings as templates.

Many basic theoretical questions are nonetheless unanswered, e.g. regarding the function of quantum fluctuations. This paintings is tackling them and offers a close research of the shipping homes of such ultrathin wires. It offers an account of theoretical versions, cost shipping experiments, and likewise conveys the most recent experimental findings concerning fabrication, measurements, and theoretical research. specifically, it's the purely to be had source for the procedure of utilizing DNA and carbon nanotubes for nanowire fabrication.

it truly is meant for graduate scholars and younger researchers attracted to nanoscale superconductivity. The readers are assumed to have wisdom of the fundamentals of quantum mechanics and superconductivity.

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Extra resources for Superconductivity in Nanowires: Fabrication and Quantum Transport

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For example, if a superconducting wire loop is exposed to a perpendicular magnetic field, the velocity of the condensate is proportional to the magnetic vector-potential, which, in turn, is proportional to the magnetic flux piercing the loop. Such a magnetically induced supercurrent is called Meissner current. It is possible because all electrons in superconductors behave coherently, as a single quantum particle (single electron). For a single electron, the velocity is proportional to vector-potential, assuming that the phase gradient is zero.

The electrochemical potential is the sum of the chemical potential and the local electric potential. Assume that the chemical potential is constant everywhere in the superconducting sample. Then, the difference of electrochemical potentials becomes the difference of electric potentials, which is the voltage V between two points. 5) where V is the voltage between two points specified by the arbitrary chosen radius vectors r 2 and r 1 . It was Anderson and Dayem [11] who first introduced this popular presentation of the phase evolution equation, in which the phase difference, φ, rather than the local value of the phase itself, φ(r, t), is used.

0, then R(T ) ! R0 , and R0 is some sample-specific constant, such that 0 < R0 < 1. All samples would then saturate at a constant resistance with cooling. Such results would indicate that there is no SIT in the studied type of samples. On the other hand, a crossover might still be present, if, for example, the experiments show that R0 gradually changes from Rn to R0 Rn , as the wire diameter is gradually reduced. The Giordano R0 models of QPS predicts such crossover behaviors [108]. It predicts that any wire has a QPS rate above zero and therefore its resistance is greater than zero at zero temperature, although, within this model, R0 depends exponentially on the wire diameter.

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