Bulletin of the American Physical Society
New England Section Fall 2022 Meeting
Volume 67, Number 13
Friday–Saturday, October 14–15, 2022; University of New Hampshire, Durham, NH
Session G01: Parallel Invited Session - Condensed Matter II |
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Chair: Shawna Hollen, Brown University Room: University of New Hampshire in Durham DeMeritt Hall 112 |
Saturday, October 15, 2022 8:30AM - 9:06AM |
G01.00001: The Convergence of Quantum Materials and Quantum Information Science Invited Speaker: Tyrel M McQueen The last five years has seen an enormous increase in investment by national governments and corporations in the broad area of quantum science and technology. What are quantum materials and quantum information science? Why are these areas exciting and seeing significant investment? How do they connect to outstanding questions in all of physics, including not just in condensed matter but questions such as: what are dark matter and dark energy? I will present my perspective on these questions drawing upon a decade of fundamental research within the Institute for Quantum Matter and the Co-Design Center for Quantum Advantage (C2QA), and how I see these two previously disparate areas rapidly converging with potential to address long-standing questions and introduce new ones. I will also discuss the broader convergence with other areas of science, including materials by design and the materials genome initiative, and data science and the data revolution. |
Saturday, October 15, 2022 9:06AM - 9:42AM |
G01.00002: Bond ordering and molecular orbital fluctuations in a cluster Mott insulator Invited Speaker: Kemp Plumb When spin orbit coupling is on equal footing with electronic correlations, the spatially anisotropic character of d-orbitals in transition metal compounds can lead to many and diverse quantum phases of matter. The most celebrated example is the Kitaev model for j=1/2 Kramers doublets on the honeycomb lattice. However, coupling of spin and orbital fluctuations can result in many more possibilities, including multi-polar order, spin liquids, and/or spin orbitals liquids. In this talk, I will discuss recent measurements on the cluster Mott insulating lacunar spinels, where electronic correlations, spin orbit coupling, and orbital degeneracy act in concert to produce several interesting magnetic and orbital phases. I will present a set of neutron and x-ray scattering results on one member of this family: GaTa4Se8, a material that realizes an orbitally active j=3/2 model on the face centered cubic lattice. I will discuss the evidence for or a dynamical spin-orbital state preceding a T*=50 K order-disorder spin-orbital ordering transition. Inelastic neutron scattering measurements reveal the dynamic nature of local distortions through symmetry forbidden optical phonon modes that modulate j = 3/2 molecular orbital occupation as well as intercluster Ta-Se bonds. The resulting staggered intercluster dimerization pattern doubles the unit cell, reflecting a spin-orbital valence bond ground state. I will discuss these results in relation to the family of Lacunar spinels. |
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