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English Caption: 

In 2014, scientists at the Swiss Light Source demonstrated that a particular type of insulator makes electrons move in an ordered way, with "topological insulator" properties necessary for spintronic devices. This image shows a topological insulator with polarized currents flowing along its surface.

More information is available in the press release "Insulator Makes Electrons Move in an Ordered Way." 

Graphic: Paul Scherrer Institute/Mahir Dzambegovic