Science, Space and Technology News 2024
ICFO researchers have discovered a new method to control electron valleys in bulk materials, potentially revolutionizing the way information is encoded and manipulated in computing and quantum technologies. Artistic illustration of the trefoil field incident on the bulk material MoS2.
In standard semiconductor electronics, the electric charge of the electrons is the most used property exploited to encode and manipulate information. But these particles have other properties that could also be used for the same purpose, such as the valley they are in. In the past decade, the main aim of valleytronics has been to reach the control of the valley population in materials.
Now, ICFO researchers Igor Tyulnev, Julita Poborska, and Dr. Lenard Vamos, led by Prof. ICREA Jens Biegert, in collaboration with researchers from the Max-Born-Institute, the Max-Planck Institute for the Science of Light, and Instituto de Ciencia de Materiales de Madrid have found a new universal method to induce valley polarization in centrosymmetric bulk materials.
As Igor Tyulnev, first author of the article, explains, “Our experiment consisted in creating an intense light pulse with a polarization that fitted this internal structure. The result was the so-called “trefoil field,” whose symmetry matched the triangular sub-lattices that constitute hetero-atomic hexagonal materials.”
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