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 UU01: V: General Physics I |
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Sponsoring Units: APS Chair: Xin Shi, University of Houston Room: Virtual Room 1 |
Wednesday, March 22, 2023 5:00AM - 5:12AM |
UU01.00001: Stopping power in a dense nonequilibrium quantum plasma using quantum kinetic theory Christopher Makait, Michael Bonitz Generation of warm dense matter in the laboratories is a nonequilibrium process in which non-adiabatic effects and strong excitation play an important role. Predicting the properties of the plasma, such as the stopping power, during this process, therefore, requires the use of a suitable nonequilibrium approach. We use Nonequilibrium Green's functions (NEGF)[1] combined with the Generalized Kadanoff-Baym Ansatz [2] to simulate ion stopping in a cylinder symmetric uniform warm dense plasma. Correlation effects are taken into account via the selfenergy Σ for which we use the static second Born approximation as well as the full dynamical screening selfenergy (GW) which generalizes the Balescu-Lenard collision integral to short time scales [1] and allows us to self-consistently include plasmons, instabilities and the screening dynamics. We first demonstrate that we are able to reproduce linear response results for quantum plasmas and then extend the simulations to nonequilibrium targets as well as to dense proton beams. Our results could be of relevance e.g. to the fast ignition by fast protons approach [3] to inertial confinement fusion that has sparked interest in recent years. |
Wednesday, March 22, 2023 5:12AM - 5:24AM |
UU01.00002: Anomalous Hall effects in the 2D antiferromagnet MnBi2Te4 driven by polar layer stacking Tengfei Cao, Ding-Fu Shao, Kai Huang, Gautam Gurung, Evgeny Y Tsymbal Van der Waals (vdW) assembly of two-dimensional (2D) materials has stimulated the discovery of new physical phenomena and functional properties useful for applications. Especially interesting is the recently discovered ferroelectricity in vdW assembled materials that are non-polar in the bulk form1. Breaking inversion symmetry accompanied by the appearance of the spontaneous electric polarization in such vdW materials opens a new direction to realize novel electronic, magnetic, and topological properties and control them by switchable polarization. Here, based on symmetry analyses and density-functional-theory calculations, we explore the emergence of the anomalous Hall effect (AHE) in antiferromagnetic MnBi2Te4 films assembled by polar layer stacking. Recently synthesized MnBi2Te4 films exhibit properties of an intrinsic magnetic topological insulator and reveal interesting quantum phenomena dependent on the number of monolayers in the film. We demonstrate that breaking PT symmetry by layer stacking in MnBi2Te4 films with an even number of layers produces an AHE whose sign changes by the switching of ferroelectric polarization. We find that reversable polarization at one of the interfaces in three-layer MnBi2Te4 films drives a metal-insulator transition, as well as switching from AHE to quantum AHE (QAHE). Finally, we predict that engineering an interlayer polarization in three-layer MnBi2Te4 films allows converting MnBi2Te4 from a trivial to nontrivial topological insulator. Overall, this work emphasizes the emergence of quantum transport phenomena in MnBi2Te4 films by polar layer stacking, which do not exist in this material in the bulk or bulk-like thin-film forms.
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Wednesday, March 22, 2023 5:24AM - 5:36AM |
UU01.00003: Strain tuned collinear-Magnetism in Mn and Co based rare-earth oxide heterostructures Gowsalya Rajan, Saurabh Ghosh, Sokrates T Pantelides Most research on rare-earth (RE)/transition-metal (TM) oxides focuses on the orthorhombic phase, but there exists a hexagonal phase, h-RETMO3, with unique magnetic and magnetoelectric properties. However, magnetic frustration due to a triangular lattice leads to spin canting and weak-ferromagnetism (wFM). Previous reports show that the magnetism of these systems can be tuned by inducing in-equivalent magnetic sublattices to reduce the magnetic frustration. Here we report theoretical investigations of heterostructures of different Mn- and Co-based h-RETMO3s. REMnO3 oxides are well known for their double exchange interactions and mixed oxidation states. Thus, it is possible to create inequivalent magnetic sublattices in Mn-based h-RETMO3s. Initial results show that if we force the system into a collinear AFM configuration, one of the three Mn (Co) in the triangular lattice of h-LuMnO3 (h-LuCoO3) goes into a low spin state (changes its oxidation state) to reduce frustration. These spin and oxidation states can be tuned by modifying the octahedral environment, e.g., by strain in heterostructures and superlattices. |
Wednesday, March 22, 2023 5:36AM - 5:48AM |
UU01.00004: Unexplored Signatures of magnetoelastic and Isosymmetric metal-insulator phase transition in a Rare-earth Nickelate via mode crystallography HARSH KUMAR, J. L Martínez, Jose Antonio Alonso, Saurabh Tripathi Rare-earth Nickelates (RNiO3) are known to exhibit a cooperative phenomenon between lattice, electronic and magnetic degrees of freedom, where R could be any member of rare earth series [1-4]. These compounds go through a sharp metal-insulator phase transition accompanied by a symmetry lowering transition from high temperature orthorhombic(metallic) to low temperature monoclinic(insulating) phase at M-I phase transition temperature (TM-I). In addition, all systems order antiferromagnetically at Neel temperature (TN), which is same as TM−I for Pr and Nd but lower than TM−I for smaller cations [3,5]. In this work [6], we have explored the phase transitions in a rare earth nickelate EuNiO3, by carrying out temperature-dependent structural analysis in conjunction with distortion mode analysis. The temperature-dependent powder Synchrotron X-ray diffraction (SXRD) studies have revealed the presence of an orthorhombic Pbnm phase (tilt system ??−??−??+), with an elementary perovskite (pseudo-monoclinic) 000 cell, over the analysed temperature range, i.e., 100-623 K [7-9]. Further, we have observed two distinct anomalies in temperature- dependent evolution of pseudo-monoclinic cell parameters (cp/ap, γ, Vmono) around 463 K and 200 K corresponding to respective Isosymmetric Metal-Insulator transition temperature (TM−I), and Neel temperature (TN) linked with a volume gain at low temperatures dictating a magnetoelastic coupling in the system. We have shown the existence of two distinct pseudo-monoclinic phases, viz., Monometal (T > TM−I) and Monoinsulator (T |
Wednesday, March 22, 2023 5:48AM - 6:00AM |
UU01.00005: Surface Engineering of Graphene SAW Gas Sensor for Effective Health Monitoring ZHOU HAOLONG To improve the quality of modern life in the current society, low-power and reliable gas sensing technology is necessary to monitor human health in real time through relevant respiratory biomarkers. However, due to the relatively small concentration and rich interfering substances, accurate identification of selective gas molecules is quite challenging. Herein, we have fabricated monolayer graphene surface acoustic gas sensor (G-SAW) with love wave for effective detection of acetone gas molecules under room temperature. We have deposited different thickness of SiO2 as the guiding layer which reduces the noise and insertion loss in fabricated device. G-SAW showed an enhanced gas response towards the acetone gas molecules (800 ppt) at room temperature. The primary sensing mechanism of G-SAW sensor is based on elastic and acoustic-electric effect which is attributed to the adsorption of acetone gas molecules on the surface of graphene. The acetone which has large dipole moment (2.69) and ionic radii easily adsorb on graphene by forming C-O bonding which leads to p-doping and shift towards high frequency in the G-SAW gas sensor. This work provides a potential strategy for detection biomarkers from human breath and diagnose the diabetic disease in human body. |
Wednesday, March 22, 2023 6:00AM - 6:12AM |
UU01.00006: Observing Edge Asymmetry Driven Enhanced Superconducting Diode Efficiency Ourania-Maria Glezakou-Elbert, Amith Varambally, Yasen Hou, Akashdeep Kamra, Patrick A Lee, Jagadeesh S Moodera Recent research efforts surrounding the superconducting diode effect have led to a better understanding of the theory underpinning the mechanism. Defects along the edges of superconductors allows for current crowding and the asymmetrical penetration of flux vortices on the edges of the material. When an out-of-plane magnetic field is applied, these phenomena, together with the Meissner screening current, result in a non-reciprocal current which leads to superconducting diode phenomenon. This scalable approach has the potential to build a highly energy efficient non-volatile memory and logic circuit using classical superconducting materials, providing motivation for further research. This work examines the effects of an asymmetrical edge in the form of a zig-zag pattern on the diode efficiency of a pure vanadium superconductor with the goal of maximizing the efficiency; efficiencies up to 50% were obtained for a pure vanadium device. |
Wednesday, March 22, 2023 6:12AM - 6:24AM |
UU01.00007: Impact of Poly-Si channel: Multiscale modeling insight from first-principles to device simulation Rita Maji, Tommaso Rollo, Shruba Gangopadhyay, Milan Pesic, Luca Larcher, Eleonora Luppi, Elena Degoli
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Wednesday, March 22, 2023 6:24AM - 6:36AM |
UU01.00008: Generalization and Unification of All Fundamental Interactions with the Unified Structure of Macroscopic and Microscopic Scale Theories (Respectively CST “Central System Theory” and GQM “Generalized Quantum Mechanics”) - "Universal Mechanics" Surendra Mund In APS March Meeting 2023, I am going to present majorly the unification of all Fundamental Interaction into N-Time Inflationary Model of Universe with Unifying both Macroscopic and Microscopic Scale Theories which was presented in APS March Meeting 2022 by me. In previous March Meeting, I have presented the unification of General Relativity (Macroscopic Scale Theory) and Quantum Mechanics (Microscopic Scale Theory) by the Principle of Central System Relativity but in APS March Meeting 2023, I am to present the Generalization and Unification of all Fundamental Interactions (Like 4-Fundamental Forces are Generalized in 3 Major categories- Variation Generated Forces (Gravitation Like Interactions), Flow Generated Forces (EM Force etc) and Transformation Generated Forces (Forces Generated by transformation of spin and Matter-Spacetime transformation). So, All Fundamental Interactions, which seems to be fundamental in Modern Physical Sense, are some manifestation of these three types of Fundamental Categories. These all Fundamental Interactions are unified under same structure under which Macroscopic and Microscopic Scale theories are Unified and this structure was briefly introduced by me in Previous March Meeting as- N-Time Inflationary Model of Universe and Universal Mechanics. Usually the problem in unification of all fundamental forces is created by Gravity but in this case at first I am unifying Gravity with EM by Generalizing the categories of these two forces in Universal Sense (in other words, these two forces are applied to all kind of central systems exist in N-Time Inflationary Model of Universe). |
Wednesday, March 22, 2023 6:36AM - 6:48AM |
UU01.00009: Theory of Stabilization and Adiabatic Current Drive of Skyrmions in Synthetic Antiferromagnets Rawana Yagan, Mehmet Cengiz Onbasli Skyrmions in synthetic antiferromagnetically (SAF) coupled multilayers have shown great promise for next-generation applications that require fast response and energy-efficient operation. Their dynamic stability against topological Hall effect and their immunity to stray fields make them candidates for applications in memory and logic devices. The conditions needed for stabilizing SAF skyrmions and how this stability depends on the material parameters and external drive conditions are not well understood. |
Wednesday, March 22, 2023 6:48AM - 7:00AM |
UU01.00010: Plasmonic Heating induced thermocapillary motion of a deformable drop Sayak Ray, Sudipta Ray, Suman Chakraborty In this paper, we explore the thermocapillary motion of a droplet in a channel induced by plasmonic heating of the surface. A three-dimensional thermocapillary-driven flow of a bubble in a homogeneous medium enclosed by a structure subject to plasmonic heating has been considered. There have been previous studies on thermo-plasmonic convection in channels induced by plasmonic heating due to frequency-dependent absorption of optical energy by nanostructures coupled to an optically absorptive substrate. To the best of our knowledge, a study of a similar phenomenon to produce variations in surface tension to drive a droplet has not been performed. The droplet is considered to be deformable and has a different fluid viscosity than the surrounding medium. The flow has been assumed to be steady. The effect of the viscosity ratio between the droplet and surrounding medium, the initial position of the droplet relative to the channel centreline along with the frequency of incident light, and spacing of the nano-structure on the droplet migration velocity is also reported. |
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