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CARBON WORLDS
Seeing electrons surfing the waves of light on graphene
by Staff Writers
Madrid, Spain (SPX) Jun 12, 2017


Electrons and light are moving in concert along the graphene sheet. Credit ICFO/ F. Vialla

Researchers have studied how light can be used to "see" the quantum nature of an electronic material. They managed to do that by capturing light in a net of carbon atoms and slowing down light it down so that it moves almost as slow as the electrons in the graphene. Then something special happens: electrons and light start to move in concert, unveiling their quantum nature at such large scale that it could observed with a special type of microscope.

The experiments were performed with ultra-high quality graphene. To excite and image the ultra-slow ripples of light in the graphene (also called plasmons), the researchers used a special antenna for light that scans over the surface at a distance of a few nanometers.

With this near field nanoscope they saw that the light ripples on the graphene moved more than 300 times slower than light, and dramatically different from what is expected from classical physics laws.

The work has been published in Science by ICFO researchers Dr. Mark Lundeberg, Dr. Achim Woessner, led by ICREA Prof. at ICFO Frank Koppens, in collaboration with Prof. Hillenbrand from Nanogune, Prof. Polini from IIT and Prof. Hone from Columbia University.

In reference to the accomplished experiments, Prof. Koppens comments: "Usually it is very difficult to probe the quantum world, and to do so it requires ultra-low temperatures; here we could just "see" it with light and even at room temperature".

This technique paves now the way for exploring many new types quantum materials, including superconductors where electricity can flow without energy consumption, or topological materials that allow for quantum information processing with topological qubits. In addition, Prof. Hillenbrand states that "this could just be the beginning of a new era of near field nanoscopy".

Prof. Polini adds that "This discovery may eventually lead to understanding in a truly microscopic fashion complex quantum phenomena that occur when matter is subject to ultra-low temperatures and very high magnetic fields, like the fractional quantum Hall effect"

Research paper: "Tunning quantum non-local effects in graphene plasmonics"

CARBON WORLDS
Revolutionary new materials for troubled carbon times: Super filters the world can afford
Kyoto, Japan (SPX) Jun 08, 2017
Around 2800BC, the ancient inhabitants of Ur, Mesopotamia made a discovery that was to change civilization. They learned that if they blended copper and tin into an alloy, the new composite material was stronger, more useful, and more valuable than any man-made substance to date. It gave its name to the entire age it revolutionized. Bronze. More than 4000 years later, in a study published ... read more

Related Links
ICFO-The Institute of Photonic Sciences
Carbon Worlds - where graphite, diamond, amorphous, fullerenes meet


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