Bulletin of the American Physical Society
2012 Annual Meeting of the California-Nevada Section of the APS
Volume 57, Number 13
Friday–Saturday, November 2–3, 2012; San Luis Obispo, California
Session A1: Plenary Session I |
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Chair: Sergey Savrasov, University of California, Davis Room: Chumash Auditorium 065-0 |
Friday, November 2, 2012 10:00AM - 10:15AM |
A1.00001: Welcome Lynn Cominsky, Nilgun Sungar |
Friday, November 2, 2012 10:15AM - 11:00AM |
A1.00002: The sometimes surprising behavior of magnetic spins on a complex surface Invited Speaker: Barbara Jones We have studied the unusual charge and spin properties of magnetic atoms (Mn, Co, Fe, Ti, Gd) on a complex surface as constructed by STM. This surface, a lattice of N atoms on Cu(100), was designed to be insulating in order to inhibit the Kondo effect (in which the Cu electrons would completely screen the spin). However, the magnetic adatom may be drawn down into the surface, or stay high above and attract surface atoms to it, with very different resulting properties. We show illustrations from our electronic structure calculations of these systems. The various magnetic atoms exhibit behavior ranging from spin chains to large-anisotropy atomic-scale molecular magnets to a Kondo effect for Co and Ti. Finally, when two magnetic atoms are close to one another, their magnetic spins can interact, with complex and interesting results. We show the unexpected results of a close-spaced 2D lattice of magnetic atoms as well. I will conclude with some comments about the role of large-scale calculations for nanostructures. Some references:\\[4pt] [1] C-Y Lin, J-L Li, Y-H Hsieh, K-L Ou, and B. A. Jones, ``Magnetic Interaction between Surface-Engineered Rare-Earth Atomic Spins,'' Phys. Rev. X 2, 021012 (2012).\\[0pt] [2] R. Pushpa, J. Cruz, and B. Jones, ``Spin and exchange coupling for Ti embedded in a surface dipolar network,'' Phys. Rev. B 84, 075422 (2011).\\[0pt] [3] C-Y Lin and B. A. Jones, ``First-principles calculations of engineered surface spin structures,'' Phys. Rev. B 83, 014413 (2011). [Preview Abstract] |
Friday, November 2, 2012 11:00AM - 11:45AM |
A1.00003: Quantum Matters Invited Speaker: Chetan Nayak Physicists have discovered states of matter where there are particles with properties not possessed by any particles seen in the vacuum. These particles are collective excitations of the electrons in these materials. Their exotic properties are a consequence of quantum mechanics and have no analog in the familiar classical world. They can be manifested when, for instance, a particle simultaneously takes two different paths from point A to point B and they interfere. Remarkably, these particles might be harnessed for a quantum computer, a hypothetical computer that could solve problems far beyond the reach of today's computers. [Preview Abstract] |
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