MIT Physicists Generate the First Snapshots of Fermion Pairs
upstart writes:
When your laptop or smartphone heats up, it's due to energy that's lost in translation. The same goes for power lines that transmit electricity between cities. In fact, around 10 percent of the generated energy is lost in the transmission of electricity. That's because the electrons that carry electric charge do so as free agents, bumping and grazing against other electrons as they move collectively through power cords and transmission lines. All this jostling generates friction, and, ultimately, heat.
But when electrons pair up, they can rise above the fray and glide through a material without friction. This "superconducting" behavior occurs in a range of materials, though at ultracold temperatures. If these materials can be made to superconduct closer to room temperature, they could pave the way for zero-loss devices, such as heat-free laptops and phones, and ultraefficient power lines. But first, scientists will have to understand how electrons pair up in the first place.
[...] "Fermion pairing is at the basis of superconductivity and many phenomena in nuclear physics," says study author Martin Zwierlein, the Thomas A. Frank Professor of Physics at MIT. "But no one had seen this pairing in situ. So it was just breathtaking to then finally see these images onscreen, faithfully."
[...] To directly observe electrons pair up is an impossible task. They are simply too small and too fast to capture with existing imaging techniques. To understand their behavior, physicists like Zwierlein have looked to analogous systems of atoms. Both electrons and certain atoms, despite their difference in size, are similar in that they are fermions - particles that exhibit a property known as "half-integer spin." When fermions of opposite spin interact, they can pair up, as electrons do in superconductors, and as certain atoms do in a cloud of gas.
Read more of this story at SoylentNews.