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Speaker-Juan José Palacios

Juan José Palacios
Universidad Autónoma de Madrid, Spain
Professor Juan José Palacios graduated in Physics at the Universidad Autónoma de Madrid (UAM) in 1989. He earned his PhD at the same university in 1993 thanks to his theoretical work on electronic structure and transport properties of semiconductor quantum dots and on various topics related to the integer and fractional quantum Hall effect (QHE). Prof. Palacios continued his career as a postdoctoral researcher at the National Research Council (Canada), Indiana University (USA), and University of Kentucky (USA) where, among other topics, he explored more in depth the many-body physics of the fractional QHE in collaboration with Allan MacDonald, also doing fundamental work on vortex matter and mesoscopic superconductivity in collaboration with Andre Geim. At the Universidad of Alicante (Spain), where Prof. Palacios worked for almost 10 years, he pioneered one of the first projects to compute quantum transport from first principles, resulting in a collection of codes currently distributed under the common denomination ANT (Atomistic NanoTransport). Since 2009 Prof. Palacios works at the department of Condensed Matter Physics (UAM). In 2014 he co-founded SIMUNE Atomistics, the first company in Spain that offers computational services for material science related industrial needs. Prof. Palacios area of expertise is in theoretical and computational Condensed Matter Physics with current interest in graphene and two-dimensional crystals, topological insulators, molecular electronics, and nanoelectronics. He is the author of over 130 publications which have received over 4300 citations. His h-index is 35.
Title:Atomic-scale control of graphene magnetism using hydrogen atoms
SymposiumA03 Flexible Electronics
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Abstract

Isolated hydrogen atoms chemisorbed on graphene have been predicted to induce magnetic moments. Direct observation of these magnetic moments and their interactions as well as their manipulation still remains a major experimental challenge. Here I will show that the adsorption of a single hydrogen atom on graphene induces a magnetic moment characterized by a 20 meV spin-split state at the Fermi energy. Our scanning tunneling microscopy (STM) experiments, complemented by first-principles calculations, show that such a spin-polarized state is essentially localized on the carbon sublattice complementary to the one where the H atom is chemisorbed. This atomically modulated spin-texture, which extends several nanometers away from the H atom, drives the direct coupling between the magnetic moments at unusually long distances. Using the STM tip to manipulate H atoms with atomic precision, we are able to select the adsorption sites and tailor the magnetism of large graphene regions. Furthermore, under the appropriate conditions a spontaneous adsorption of H on only one sublattice can be achieved with its concomitant  long-range ferromagnetic order. A proposal to use hydrogenated graphene as spin-polarized current injector, thus avoiding metal-contacts, will be presented.

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Abstract: Minyang Lu

Sponsor: Wenyang Yang

Media: Liping Wang

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