Klein Tunneling (IMAGE)
Caption
In Klein tunneling, a negatively charged electron (brightly colored sphere) can transit perfectly through a barrier. In a new experiment, researchers observed the Klein tunneling of electrons into a special kind of superconductor. As electrons tunneled through the barrier, they each picked up a partner, doubling the conductance measured in the experiment. To balance out the extra negatively charged electron, a positively charged hole (dark sphere) is reflected back from the barrier--a process known as Andreev reflection.
Credit
Emily Edwards/Joint Quantum Institute
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