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originally posted by: yuppa
a reply to: AlanHenderson
I miss your gendo avatars lol.
Physicists from Nanyang Technological University, Singapore (NTU Singapore) and the Niels Bohr Institute in Copenhagen, Denmark, have devised a method to turn a non-magnetic metal into a magnet using laser light.
Magnets and their magnetic field are typically produced by circulating currents, like those found in everyday electromagnetic coils. The 'handedness' of these coils—whether they are wound in clockwise or anticlockwise fashion—determines the direction of the magnetic field produced.
The scientists theorize that when non-magnetic metallic disks are illuminated by linearly polarized light—light that does not possess any handedness of its own—circulating electric currents and hence magnetism can spontaneously emerge in the disk.
This method could in principle turn non-ferrous metals into magnets "on-demand" using laser light.
Emergent behaviour, where the whole is more than the sum of its parts, arises when many particles interact with each other to act in a collective way. It is responsible for a range of useful phases of matter such as ferromagnets and superconductors that are typically controlled by temperature. The team's research extends this idea to plasmons and puts forward how it can be controlled by light irradiation.
"On a deeper level, there are many fundamental questions to explore about the nature of the non-equilibrium spontaneous symmetry breaking ("emergence") that we predicted," said Associate Professor Rudner.
The non-equilibrium control of emergent phenomena in solids is an important research frontier, encompassing effects such as the optical enhancement of superconductivity. Nonlinear excitation of certain phonons in bilayer copper oxides was recently shown to induce superconducting-like optical properties at temperatures far greater than the superconducting transition temperature, Tc (refs 4, 5, 6). This effect was accompanied by the disruption of competing charge-density-wave correlations, which explained some but not all of the experimental results. Here we report a similar phenomenon in a very different compound, K3C60. By exciting metallic K3C60 with mid-infrared optical pulses, we induce a large increase in carrier mobility, accompanied by the opening of a gap in the optical conductivity. These same signatures are observed at equilibrium when cooling metallic K3C60 below Tc (20 kelvin). Although optical techniques alone cannot unequivocally identify non-equilibrium high-temperature superconductivity, we propose this as a possible explanation of our results.
The researchers are advancing the quantum frontier by finding new macroscopic supercurrent flowing states and developing quantum controls for switching and modulating them.
A summary of the research team’s study says experimental data they obtained from a terahertz spectroscopy instrument indicates terahertz light-wave tuning of supercurrents is a universal tool “and is key for pushing quantum functionalities to reach their ultimate limits in many cross-cutting disciplines” such as those mentioned by the science foundation.
And so, the researchers write, “We believe that it is fair to say that the present study opens a new arena of light-wave superconducting electronics via terahertz quantum control for many years to come.”
The Army Research Office supports Wang’s research.
originally posted by: TEOTWAWKIAIFF
The skin is layered (assuming that you can can make atomically thin materials). What if you have an area where the photons impact and put pressure on the next layer? Then that gets converted back to the surroundings (somehow).
It would be like those pins in a box making a 3D image of what was pressed against it. But with photons and 2D materials stacked on top of each other!
Heck, that would work across the entire skin so anywhere on the craft you could “see” outside!!