Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session G36: Physical Review Invited Session: Forefront Research Across DisciplinesInvited
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Sponsoring Units: APS Chair: Samindranath Mitra, American Physical Society Room: Room 236 |
Tuesday, March 7, 2023 11:30AM - 12:06PM |
G36.00001: Quantum Hardware: for Foundational Physics and Engineering Prototyping Invited Speaker: Marissa Giustina We discuss the motivation, background, technical implementation, and essential findings of two large quantum hardware experiments: a photon-based "Loophole-free" test of Bell's Inequality, and a quantum computer prototype. We review the respective experimental setups, and some of the hardware developments that enabled each experiment. A comparison reveals some significant differences between the experiments, but we also observe similarities, including roots in quantum foundations and reliance on systems engineering. |
Tuesday, March 7, 2023 12:06PM - 12:42PM |
G36.00002: Superconductivity in infinite-layer nickelates Invited Speaker: Harold Hwang Finding unconventional superconductors in proximity to various strongly correlated electronic phases has been a recurring theme in materials as diverse as heavy fermion compounds, cuprates, pnictides, and twisted bilayer graphene. The recent discovery of superconductivity in layered nickelates1 was motivated by looking for an analog of the cuprates. The synthesis of the nickelates is in and of itself interesting – it involves the removal of planes of oxygen from a 3D nickel oxide using soft chemistry techniques. We will introduce this new family of superconductors and our current understanding of their electronic and magnetic structure. Notable aspects are a doping-dependent superconducting dome2, strong magnetic fluctuations3, instabilities towards charge stripes4, and a landscape of unusual normal state properties from which superconductivity emerges5. These features are strongly reminiscent of the cuprates, despite key differences in the electronic structure and the absence of a proximate correlated insulator. |
Tuesday, March 7, 2023 12:42PM - 1:18PM |
G36.00003: Acoustically Levitated Granular Matter: From Meso-Scale Particle Assembly to Tabletop Asteroids Invited Speaker: Heinrich M Jaeger Granular matter can serve as a prototype for exploring the rich physics of many-body systems driven far from equilibrium. This talk will outline a new frontier for granular physics with macroscopic particles, where acoustic levitation compensates the forces due to gravity and eliminates frictional interactions with supporting surfaces in order to focus on particle interactions. Levitating small particles by intense ultrasound fields in air makes it possible to manipulate and control their positions and assemble them into larger aggregates. Furthermore, sound scattered off individual, levitated solid particles gives rise to tunable attractive forces among neighboring particles. The small air viscosity implies that a regime of complex, underdamped dynamics can be explored where inertial effects are important, and at the same time hydrodynamic instabilities can induce active fluctuations. I will discuss recent work that exploits acoustic levitation to self-assemble small particles, 10s to 100s of microns in diameter, into freely floating rafts and track their interactions with high-speed video imaging. These rafts can be manipulated by external forcing into regimes of extreme plastic deformation or rotated rapidly to the point of breakup similar to rubble pile asteroids [1]. By changing the interparticle spacing and controlling the energy density in the acoustic cavity, the rafts can transform from close-packed solids into extremely soft lattices that exhibit intermittency and dynamic heterogeneity [2], and that can melt into 2D liquids and eventually expand into 3D particle swarms. Along the way, acoustically levitated granular matter provides an exciting new platform to study the nature of instabilities induced by hydrodynamic coupling in multi-particle systems. |
Tuesday, March 7, 2023 1:18PM - 1:54PM |
G36.00004: Two-Dimensional Semiconductors for Quantum Science and Technologies Invited Speaker: Amalia Patane Semiconductors are the pillars of modern science and technologies. Their growing demand in high-performance systems for sensing, communications and computing, is paralleled by opportunities for future advances and innovative approaches to quantum information, Artificial Intelligence (AI) and fast, secure communication. These require an increasing miniaturization of materials, advanced methods to probe and manipulate their properties at the nanoscale, and the development of integration technologies for their use in functional devices for applications across different sectors. |
Tuesday, March 7, 2023 1:54PM - 2:30PM |
G36.00005: Extracting the energy (and the physics) out of water. Invited Speaker: Marivi Fernandez-Serra The condensed phases of water are a never-ending source of strange physics phenomena. From thermodynamic anomalies to uncommon nuclear quantum effects, the list of anomalous behavior just keeps on increasing. In principle, it is also a “never-ending” source of Hydrogen, the ideal green energy fuel. However, splitting water into Oxygen and Hydrogen molecules is a highly endothermic process. Ideally sufficiently energetic solar photons, when absorbed by the right semiconductor material can catalyze the reaction. To do so several critical physical processes both within the semiconductor material and at its surface in contact with water need to occur at the right time and energy scales. In this talk I will present how ab initio computational modelling of the water-semiconductor interface, combined with experimental insight has advanced our understanding of these complex mechanisms. |
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