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Items tagged with "topological insulator"

April 22, 2016

Oscillating currents point to practical application for topological insulators

Scientists studying an exotic material have found a potential application for its unusual properties, a discovery that could improve devices found in most digital electronics.

Under the right conditions the material, a compound called samarium hexaboride, is a topological insulator—something that conducts electricity on its surface but not through its interior. The first examples of topological insulators were only recently created in the lab, and their discovery has sparked a great deal of theoretical and experimental interest.

December 13, 2013

Ring around the resonator

Ring resonators are circular waveguides that are used as optical cavities. They look like tiny racetracks and are often fabricated from silicon. Photons can enter and exit a resonator and even move to neighboring waveguides through evanescent coupling. The micro-rings only let light waves circulate-- “resonate”-- if they have the right wavelength. This image, featured on the cover of the December 2013 issue of Nature Photonics, depicts an array of ring resonators designed to be a photonic analog to electrons experiencing quantum Hall physics. Read more to learn more about these micro-racetracks.

March 19, 2013

Topology

All materials are composed of the same basic stuff--atoms and their electrons. Atoms come in 118 different types, giving rise to enormous variation in material properties. For example, aluminum conducts electricity; add some oxygen and you get insulating aluminum oxide. One is shiny; the latter is whitish and dull.

January 29, 2013

An Ideal Material

An old material gets a new name, and with it, topological insulators have another chance to shine. Samarium hexaboride (SmB6) has been around since the late 1960s--but understanding its low temperature behavior has remained a mystery until recently. Experimentalists* have recently confirmed that this material is the first true 3D topological insulator—as originally predicted by JQI/CMTC theorists in 2010.

May 21, 2012

A Magnetic Approach to Lattices

As an extension of their work on generating synthetic fields, Ian Spielman's group has developed a new kind of lattice for atoms.

April 17, 2012

Finding Majorana - Update

A group at Delft University in the Netherlands led by L.P. Kouwenhoven has published experimental signatures of Majorana particles. The experiment precisely follows the theoretical proposals made in 2010 by Sankar Das Sarma and his collaborators at JQI.

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