Abstract
Topological insulators (TIs) insulate in their bulk and conduct electricity on their
surfaces. In 2-D TIs, the edge current has scatter-free propagation, making it extremely
robust. Perhaps the most intriguing feature of this new class of solids is that their physical
properties are related to topological quantities rather than geometric ones, meaning they are
not affected by small perturbations. Besides their impact on fundamental science, TIs may lead
to sophisticated applications in quantum devices and spintronics.
© 2013 Optical Society of America
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