Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session K60: Topology Matters: Structure-Property Relationships On Different Length ScalesInvited
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Sponsoring Units: FECS FIP Chair: Daniel Dessau, University of Colorado, Boulder Room: BCEC 258A |
Wednesday, March 6, 2019 8:00AM - 8:36AM |
K60.00001: Artificial Ferroic Systems: Magnetic Monopoles, Chirality and Bloch Point Singularities Invited Speaker: Laura Heyderman In artificial ferroic systems [1], novel functionality is engineered through the combination of designed ferroic structures and the control of the interactions between the different components. We probe their behaviour with large-scale facility methods including synchrotron x-rays and low energy muon spectroscopy, which give unparalleled information on microscopic magnetic phenomena. |
Wednesday, March 6, 2019 8:36AM - 9:12AM |
K60.00002: Topological soft matter: from metamaterials to polymers Invited Speaker: Jayson Paulose
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Wednesday, March 6, 2019 9:12AM - 9:48AM |
K60.00003: Geometrical Frustration Beyond Magnets Invited Speaker: Joseph Paddison Geometrical frustration – the inability of a system to satisfy all of its interactions simultaneously because of geometrical constraints – can suppress conventional ordering and promote the formation of exotic states that are disordered, yet strongly correlated. Materials in which magnetic spins occupy lattices built from corner or edge-sharing triangles have provided many examples of novel magnetic behavior due to frustration. In this talk, I will discuss how frustration of structural (nonmagnetic) degrees of freedom – charge states, orbital orientations, or chain displacements – can determine the structures and properties of materials. I will also discuss how the nonmagnetic frustrated interactions can be mapped to equivalent “toy” spin Hamiltonians, including those that are challenging to realize experimentally in magnets. I illustrate these points using three real examples of nonmagnetic frustration. First, I discuss how the solid phases of silver(I) and/or gold(I) cyanides, in which polymeric chains occupy a triangular lattice, can host structural analogs of the spin vortices of triangular XY magnets [1]. Second, I discuss the pyrochlore oxide Y2Mo2O7, and explain how orbital dimerization of Jahn-Teller active Mo4+ ions on the frustrated pyrochlore lattice may yield an orbital-ice analog of spin-ice and water-ice states [2]. Finally, I discuss the triangular-lattice-based system YbMgGaO4 [3,4] – of interest because of proposed quantum-spin-liquid-like behaviour of its magnetic Yb3+ ions – and show how the charge difference between nonmagnetic Mg2+and Ga3+generates a structurally-frustrated state, with implications for the proposed quantum-spin-liquid behaviour. |
Wednesday, March 6, 2019 9:48AM - 10:24AM |
K60.00004: Experimental realization of higher order topological states in classical systems Invited Speaker: Alexander Khanikaev TBD |
Wednesday, March 6, 2019 10:24AM - 11:00AM |
K60.00005: Self-assembled 1D nanostructures on semiconductor surfaces Invited Speaker: Maria Longobardi Self-assembled one-dimensional (1D) nanostructures have attracted considerable attention in the last decades |
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