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SUMMARY:CM Seminar: Phonons with a Twist: Measuring the Phonon Hall Viscosity in a Proposed Quantum Spin Liquid\, Brad Ramshaw\, Cornell University
DESCRIPTION:Speaker: Brad Ramshaw\, Cornell University \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Phonons with a Twist: Measuring the Phonon Hall Viscosity in a Proposed Quantum Spin Liquid \nAbstract: The thermal Hall effect\, where a temperature gradient develops perpendicular to both a heat current and an applied magnetic field\, has emerged unexpectedly in a wide range of insulating materials. These include the Mott-insulating parent compounds of cuprate superconductors\, several proposed spin-liquid candidates\, and\, more recently\, almost everything. This raises fundamental questions: Are these thermal Hall effects driven by intrinsic coupling between heat carriers and magnetic fields? What are the heat carriers? And can we trust the data? \nRuCl3 has been at the center of this debate\, initially proposed to host chiral Majorana edge modes that produce a quantized thermal Hall effect. Competing explanations invoke phonon skew scattering – an extrinsic mechanism. \nI will introduce the concept of phonon Berry curvature and show how it gives rise to phonon Hall viscosity – a dissipationless viscosity that rotates phonon polarizations and bends their trajectories. I will then show how we use ultrasonic measurements to directly probe phonon Hall viscosity. Our results reveal that phonons in RuCl3 exhibit a Hall viscosity that both qualitatively and quantitatively accounts for the observed thermal Hall effect. This finding overturns both prevailing views: the thermal Hall effect in RuCl3 is neither extrinsic nor is it due to Majorana edge modes. Instead\, it arises from intrinsic coupling between lattice and spin degrees of freedom. \nMore broadly\, I will argue that the acoustic Faraday effect is a powerful tool for detecting phonon Hall viscosity and the associated Berry curvature in gapped topological states of matter. I will also comment on the current state of thermal transport experiments and give a possible explanation for the unexpected abundance of insulators with thermal Hall effects.
URL:https://qmi.miffanytark.com/event/cm-seminar-phonons-with-a-twist-measuring-the-phonon-hall-viscosity-in-a-proposed-quantum-spin-liquid-brad-ramshaw-cornell-university/
CATEGORIES:CM Seminar
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DTSTART;TZID=America/Vancouver:20260312T100000
DTEND;TZID=America/Vancouver:20260312T110000
DTSTAMP:20260305T234644Z
CREATED:20260305T234644Z
LAST-MODIFIED:20260305T234644Z
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SUMMARY:CM Seminar: Foundational Graph Atomic Cluster Expansion for Atomistic Thermodynamic and Kinetic Simulation\, Ralf Drautz\, Ruhr-Universität Bochum
DESCRIPTION:Speaker: Ralf Drautz\, Ruhr-Universität Bochum \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Foundational Graph Atomic Cluster Expansion for Atomistic Thermodynamic and Kinetic Simulation \nAbstract: The atomic-scale simulation of technological materials requires a departure from task-specific approximations toward universal foundations capable of generalizing across diverse chemistries. While first-principles methods offer the necessary accuracy\, they lack the scalability required for foundational coverage. This presentation introduces the Graph Atomic Cluster Expansion (GRACE)\, a framework designed to bridge this gap by providing a mathematically complete and computationally efficient description of atomic interactions. \nGRACE unifies equivariant message-passing with high-body-order polynomials\, enabling the development of foundational parameterizations that span the periodic table. I will demonstrate that GRACE facilitates robust thermodynamic and kinetic simulations for a wide range of materials\, including materials with complex\, multi-component compositions. Specific applications will be presented\, including the computation of phase diagrams and the prediction of diffusion kinetics in complex solids. Finally\, I will address the incorporation of magnetism and charge transfer and discuss the systematic generation of comprehensive training datasets for creating transferable and accurate foundational parameterizations.
URL:https://qmi.miffanytark.com/event/cm-seminar-foundational-graph-atomic-cluster-expansion-for-atomistic-thermodynamic-and-kinetic-simulation-ralf-drautz-ruhr-universitat-bochum/
CATEGORIES:CM Seminar
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DTSTART;TZID=America/Vancouver:20260326T100000
DTEND;TZID=America/Vancouver:20260326T110000
DTSTAMP:20260316T221454Z
CREATED:20260316T221454Z
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SUMMARY:CM Seminar: Real-Space Superconductivity: Schafroth\, Bipolarons\, Cuprates\, Pavel Kornilovich (Oregon State University)
DESCRIPTION:Speaker: Pavel Kornilovich\, Oregon State University \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Real-Space Superconductivity: Schafroth\, Bipolarons\, Cuprates \nAbstract: The idea that superconductivity might arise from the condensation of real-space electron pairs was proposed by Swiss physicist Robert Schafroth several years before the development of BCS theory. Although this concept is now known as Bose-Einstein-condensation superconductivity\, Schafroth’s contributions are largely forgotten. In this talk\, I will briefly review Schafroth’s work and his complex relationships with John Bardeen and Leon Cooper. I will then describe a version of real-space superconductivity involving phonon bipolarons as normal-state charge carriers. I argue that anisotropic bipolarons account for many of the properties of the copper-oxide superconductors discovered in 1986. I will discuss how a deeper understanding of bipolarons might help raise the critical temperature beyond the current record of 133 K.
URL:https://qmi.miffanytark.com/event/cm-seminar-real-space-superconductivity-schafroth-bipolarons-cuprates-pavel-kornilovich-oregon-state-university/
CATEGORIES:CM Seminar
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