The Resistor - How Voltage Drops

A resistor driven by a voltage source.Resistors, capacitors and inductors are the basic passive elements of any electric circuit. Find out why resistors are so important, how we may describe and characterize them and what materials they are made off!

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The "Mass" of the Photon - Magnetic Fields in Superconductors

a levitating superconductorIf photons had a nonvanishing mass, the electromagnetic fields would show different characteristics than those we are used to: a wavelength dependence of the speed of light, modifications of Coulomb's and Ampères law and thus different fields for charges and dipoles and so on. Find out more about the photon mass and how related theories can be used to describe superconductivity.

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Nanoantennas to Control Quantum Systems

A nanoantenna is used to control the forbidden transition of a quantum system.Richard Feynman gave a remarkable talk at Caltech in 1959 called There’s Plenty of Room at the Bottom. In his contribution, Feynman formulated a noble challenge:
"But I am not afraid to consider the final question as to whether, ultimately - in the great future - we can arrange the atoms the way we want; the very atoms, all the way down!"
I think we have reached that goal!

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