Bulletin of the American Physical Society
Far West Section Fall 2021 Meeting
Volume 66, Number 12
Friday–Saturday, October 29–30, 2021; Virtual
Session L01: Condensed Matter -2 |
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Chair: Alessandra Lanzara, UCBerkeley |
Saturday, October 30, 2021 10:00AM - 10:12AM |
L01.00001: Effects of Strain on Single Electron Devices Edgar Garcia, Justin Perron Gate-defined quantum dots have the ability to isolate and control individual electrons. This ability makes them a promising candidate quantum computing architecture. Control is achieved by applying electrostatic forces via metallic gates deposited on the surface of a semiconducting crystal. The requirement that these devices be operated at extremely low temperatures coupled with the difference in thermal expansion between the metallic gates and the semiconductor crystal results in a complicated strain profile during operation. To better understand effects of this strain profile, we perform finite-element simulations of these devices and look at how the gate-induced strain impacts the electron states in these devices. In agreement with previous studies, our results suggest that strain can lead to changes in quantum dot location as well as the formation of unintentional quantum dots. Building on these results, future studies will incorporate the electrostatics from the gates into these simulations to provide a more complete picture of these devices. Ultimately, we aim to accurately predict quantum dot location as well as the location and energy associated with any strain-induced unintentional charge traps. [Preview Abstract] |
Saturday, October 30, 2021 10:12AM - 10:24AM |
L01.00002: Stabilization of 3-dimensional charge order through interplanar orbital hybridization in Pr$_{x}$Y$_{1-x}$Ba$_{2}$Cu$_{3}$O$_{6+\delta }$ Brandon Gunn, Alejandro Ruiz, Yi Lu, Kalyan Sasmal, Hai Huang, Jun-Sik Lee, Fanny Rodolakis, Timothy Boyle, Morgan Walker, Yu He, Santiago Blanco-Canosa, Eduardo da Silva Neto, Brian Maple, Alex Frano In the copper oxides, two-dimensional (2D) charge order (CO) is a universal phase that competes with superconductivity but is only a short-range phenomenon primarily due to disorder. Three-dimensional (3D) CO can emerge by applying magnetic field or strain, but a 2D CO component remains present and the out-of-plane correlation lengths remain shortened by disorder. We report Cu-L$_{3}$ and Pr-M$_{5}$ resonant x-ray scattering experiments and band structure calculations on Pr$_{x}$Y$_{1-x}$Ba$_{2}$Cu$_{3}$O$_{6+\delta }$ showing that, through the hybridization between the Pr 4$f$ orbital and CuO$_{2}$ electronic states, 3D CO can be stabilized with the highest reported out-of-plane correlation length. Importantly, we do not detect any evidence of 2D CO. These results provide the first observation of a fully stabilized and isolated 3D CO phase that can be achieved by tuning the orbital character of the electronic structure. [Preview Abstract] |
Saturday, October 30, 2021 10:24AM - 10:36AM |
L01.00003: Study of the Molecular Arrangement of the Metallo-organic Molecule Copper Phthalocyanine on Graphene through Electronic Transport, Atomic Force and Transmission Electron Microscopy Francisco Ramirez, Patrick Barfield, Maya Martinez, Ho Chan, Chris Regan, Thomas Gredig, Claudia Ojeda-Aristizabal While the last decade and a half has seen great strides in exploiting graphene's unique electronic properties; more recent years have focused on inducing and tuning functionalities derived from strong electronic correlations, spin-orbit coupling by building heterostructures with two-dimensional materials. Here, we present electronic transport measurements as well as transmission electron microscopy (TEM) and atomic force microscopy (AFM) characterization of a hexagonal boron nitride/graphene/copper phthalocyanine (h-BN/Gr/CuPc) heterostructure. Copper phthalocyanine is a paramagnetic metal-organic molecule consisting of 32 carbons, 16 hydrogens, 8 nitrogens, and a central copper atom. The molecular arrangement of CuPc is known to be highly dependent on the interaction with the substrate and the temperature during deposition. We have observed a marked temperature dependence of the differential conductance of the h-BN/Gr/CuPc device that may be attributed to the rearrangement of the metallo-organic molecules on graphene at different temperatures. [Preview Abstract] |
Saturday, October 30, 2021 10:36AM - 10:48AM |
L01.00004: Probing the Electronic Band Structure of the Ferromagnetic Semiconductor VI3 using Angle Resolved Photoemission Spectroscopy Derek Bergner, Tai Kong, Ping Ai, Daniel Eilbott, Claudia Fatuzzo, Samuel Ciocys, Nicholas Dale, Conrad Stansbury, Drew Latzke, Ryan Reno, Alessandra Lanzara, Claudia Ojeda-Aristizabal Since the discovery of graphene, the one atom thick crystal of carbon, there has been a push for more two-dimensional Van der Waals materials with interesting electronic properties, particularly those materials that exhibit intrinsic ferromagnetic properties in the 2-D realm. Vanadium Triiodide (VI3) is a honeycomb material with an iodine-iodine van der Waals gap between the layers that has shown promise as a two-dimensional ferromagnet. Angle Resolved Photoemission Spectroscopy (ARPES) is an experimental tool that utilizes the photoelectric effect to unveil the band structure and electronic properties of materials. We have measured the band structure of VI3 finding agreement with recent reports [1]. Our study using different polarizations of the light, provides information about the character and geometry of the orbitals that give VI3 its magnetic properties. [1] A. Kundu, Y. Liu and T. Valla, Scientific Reports 10 15602 (2020). [Preview Abstract] |
Saturday, October 30, 2021 10:48AM - 11:00AM |
L01.00005: Simulating magnetic permeability measurements of a resonant ferromagnetic thin film in the GHz range with a short circuited microstrip using COMSOL Multiphysics Alexander Cabot The goal of the project is to simulate measurements of complex magnetic permeability of a ferromagnetic (FM) thin film with Landau-Lifshitz-Gilbert resonance and recover input parameters as proof of concept. Simulation experiments were conducted by designing a permeameter using a short circuited microstrip in COMSOL Radio Frequency module. The S$_{11}$(f) reflection parameter of the empty structure, structure with an empty dielectric substrate, structure with substrate and calibration thin film, and structure with substrate with the sample resonant thin film were measured. Reflection measurements are used to calculate effective permeability of the sample and the calibration film is used to fit the permeability of the sample film. The predicted frequency response was detected in the real and imaginary parts of magnetic permeability. Large exponential growth in the magnetic permeability at low frequencies, likely due to interaction between the microstrip structure and FM thin film, were also observed. This project is different than similar experiments because this simulation models the whole design and measurement process. [Preview Abstract] |
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