Bulletin of the American Physical Society
Annual Meeting of the APS Four Corners Section
Volume 62, Number 17
Friday–Saturday, October 20–21, 2017; Fort Collins, CO
Session N1: Plenary III |
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Chair: Susan Rempe, Sandia National Laboratories Room: Lory Student Center Theatre |
Saturday, October 21, 2017 2:15PM - 2:51PM |
N1.00001: Spin-Orbit Coupled Quantum Magnetism Invited Speaker: Kate Ross “Quantum magnetism” refers to magnetic phases with physical properties that are determined by strong quantum fluctuations. These include phases in which spins are long range entangled, as in the large number of theoretically predicted “Quantum Spin Liquid” (QSL) phases, from which exotic fractionalized quasi-particle excitations (spinons) are expected to arise. The QSL phases have previously been sought in “spin only” magnetic materials with isotropic interactions, and a few candidates have emerged, but an experimental “smoking gun” for the positive identification of such QSLs is still lacking. However, recently a new wave of quantum phases, including QSLs that would provide “smoking gun” experimental signatures, are being discovered in models with anisotropic interactions, which are physically realizable in materials where the spin and orbital angular momenta of the unpaired electrons are intimately linked by spin-orbit coupling (SOC). I will discuss the strong SOC pyrochlore material Yb$_2$Ti$_2$O$_7$ and show how inelastic neutron scattering was used to quantitatively determine its anisotropic interactions. This direct determination makes Yb$_2$Ti$_2$O$_7$ one of the first SOC quantum magnets with a quantitatively-known Hamiltonian, and provides a theoretical starting point for understanding its unusual dynamical properties which have long-evaded explanation in terms of conventional magnetism. [Preview Abstract] |
Saturday, October 21, 2017 2:51PM - 3:27PM |
N1.00002: NASA's Juno Mission to Jupiter: What is Inside the Giant Planet Invited Speaker: Fran Bagenal Juno's principal goal is to understand the origin and evolution of Jupiter. Underneath its dense cloud cover, Jupiter safeguards secrets to the fundamental processes and conditions that governed our solar system during its formation. As our primary example of a giant planet, Jupiter can also provide critical knowledge for understanding the planetary systems being discovered around other stars. With its suite of science instruments, Juno will investigate the existence of a solid planetary core, map Jupiter's intense magnetic field, measure the amount of water and ammonia in the deep atmosphere.~ JUNO is also the first spacecraft to fly over Jupiter's aurora and will measure both the energetic particles raining down on the planet and the bright ``northern and southern lights'' they excite. NASA's JUNO mission was launched in August 2011 and was put into orbit over Jupiter's poles on 4th July 2016. [Preview Abstract] |
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