Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session B60: DMP Prize SessionInvited
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Sponsoring Units: DMP GMAG Chair: Nitin Samarth, Pennsylvania State University Room: BCEC 258A |
Monday, March 4, 2019 11:15AM - 11:51AM |
B60.00001: James C. McGroddy Prize for New Materials Talk: FA Catalogue of Topological Materials Using Topological Quantum Chemistry Invited Speaker: Andrei B Bernevig We will show how, using a new theory called Topological Quantum Chemistry, thousands of new topological materials can be predicted, classified and discovered. The result is that more than 30 percent of all materials in nature are topological. |
Monday, March 4, 2019 11:51AM - 12:27PM |
B60.00002: James C. McGroddy Prize for New Materials Talk: Topological Materials Science Invited Speaker: Claudia Felser Topology, a mathematical concept, recently became a hot and truly transdisciplinary topic in condensed matter physics, solid state chemistry and materials science. Since there is a direct connection between real space: atoms, valence electrons, bonds and orbitals, and reciprocal space: bands, Fermi surfaces and Berry curvature, a simple classification of topological materials in a single particle picture should be possible [1]. One important criterion for the identification of the topological material is, in the language of chemistry, the inert pair effect of the s-electrons in heavy elements, and the symmetry of the crystal structure. Binary phosphides are an ideal material class for a systematic study of Dirac, Weyl and new Fermion physics, since these compounds can be grown as high-quality single crystals. A new class of topological phases that have Weyl points was also predicted in the family that includes NbP, NbAs. TaP, MoP and WP2 [2-5]. In magnetic materials the Berry curvature and the classical anomalous Hall and spin Hall effect helps to identify potentially interesting candidates. As a consequence, the magnetic Heusler compounds have already been identified as Weyl semimetals: for example, Co2YZ, Mn3Sn and Co3Sn2S2 [6]. The Anomalous Hall angle also helps to identify materials in which a quantum anomalous Hall effect should be possible in thin films. Even beyond this reciprocal Berry curvature, Heusler compounds with non-collinear magnetic structures also possess real-space topological states in the form of magnetic antiskyrmions, which have not yet been observed in other materials [7]. |
Monday, March 4, 2019 12:27PM - 1:03PM |
B60.00003: James C. McGroddy Prize for New Materials Talk: Chiral zero sound and quantum oscillations in the thermal conductivity of Weyl semimetals Invited Speaker: Xi Dai Quasi-particles and collective modes are two fundamental aspects that characterize a quantum mater in additional to its ground state features. For example, the low energy physics for Fermi liquid phase in He-III was featured not only by Fermionic quasi-particles near the chemical potential, but also by fruitful collective modes in the long wave length limit, including several different sound waves that can propagate through it under different circumstances. On the other hand, it is very difficult for sound waves to be carried by the electron liquid in the ordinary metals, due to the fact that long range Coulomb interaction among electrons will generate plasmon gap for ordinary electron density waves and thus prohibits the propagation of sound waves through the electron liquid. In the present paper, we propose an unique type of acoustic collective modes formed by Weyl fermions under the magnetic field, which is called chiral zero sound (CZS). The CZS only exists and propagates along an external magnetic field for Weyl semi-metal systems containing multiple-pairs of Weyl points. The sound velocity of CZS is proportional to the field strength in the weak field limit, whereas oscillates dramatically in the strong field limit generating completely new mechanism for quantum oscillations through the dynamics of neutral Bosonic excitation, which may manifests itself in the thermal conductivity measurements under magnetic field. |
Monday, March 4, 2019 1:03PM - 1:39PM |
B60.00004: David Adler Lectureship Award in the Field of Materials Physics Talk: Sorting through messy semiconductors with first principles calculations Invited Speaker: Giulia Galli Using first principles molecular dynamics and electronic structure calculations, we investigate fundamental properties of complex semiconductors and their relevance to the design of electronic and quantum information devices. In particular, we discuss assemblies of semiconducting nanoparticles used in colloidal solar cells and electronic devices, and defective semiconductors as promising hosts for spin qubits. |
Monday, March 4, 2019 1:39PM - 2:15PM |
B60.00005: George E. Valley, Jr. Prize Talk: Picoscale Engineering of Oxide Quantum Materials Invited Speaker: Julia Mundy Materials systems with many strongly interacting degrees of freedom can host some of the most exotic physical states known. In thin films, the interface between two distinct quantum materials forms a further playground to engineer emergent ground states. Here we demonstrate how we can combine atomically-precise thin film synthesis with picoscale imaging of the resulting structure, to design, construct and probe novel quantum materials at the sub-Angstrom length scales. We will consider a series of complex oxide superlattices where tuning the local distortions of the lattice can lead to dramatic changes in the electronic and magnetic properties of the system. We will demonstrate how this technical approach allows us to stabilize previously metastable “hidden” ground states to construct the first room-temperature strong multiferroic material and a high energy density antiferroelectric system. |
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