Shane A. Cybart
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View article: Structural Changes in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub> Thin Films Modified with He<sup>+</sup>-Focused Ion Beam for High-Temperature Superconductive Nanoelectronics
Structural Changes in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub> Thin Films Modified with He<sup>+</sup>-Focused Ion Beam for High-Temperature Superconductive Nanoelectronics Open
Irradiation of high-temperature superconductor YBa2Cu3O7 (YBCO) with high-energy He+ ions is known to cause structural changes in the YBCO film, decreasing the critical temperature TC and finally leading to a superconductor-to-insulator tr…
View article: Fabrication and Application of Nano-SQUID Magnetometer to Scanning Imaging of Two-Dimensional Quantum Materials
Fabrication and Application of Nano-SQUID Magnetometer to Scanning Imaging of Two-Dimensional Quantum Materials Open
Superconducting quantum interference devices (SQUIDs) are directly sensitive to magnetic flux. Nano-fabricated SQUID chip with miniaturized superconducting circuits can be further utilized as scanning probes for imaging of materials. Scann…
View article: High-temperature superconductor quantum flux parametron for energy efficient logic
High-temperature superconductor quantum flux parametron for energy efficient logic Open
We report the fabrication and measurement of quantum flux parametron logic from high-transition-temperature Josephson junctions operating at 25 K, above the temperature of liquid helium. The circuits are written directly into the plane of …
View article: Collective neural network behavior in a dynamically driven disordered system of superconducting loops
Collective neural network behavior in a dynamically driven disordered system of superconducting loops Open
Collective properties of complex systems composed of many interacting components such as neurons in our brain can be modeled by artificial networks based on disordered systems. We show that a disordered neural network of superconducting lo…
View article: Information dynamics of our brains in dynamically driven disordered superconducting loop networks
Information dynamics of our brains in dynamically driven disordered superconducting loop networks Open
Complex systems of many interacting components exhibit patterns of recurrence and emergent behaviors in their time evolution that can be understood from a new perspective of physics of information dynamics, modeled after one such system, o…
View article: In-plane tunnel spectroscopy of cuprate superconductors with nano-scale Josephson junctions
In-plane tunnel spectroscopy of cuprate superconductors with nano-scale Josephson junctions Open
Superconducting tunnel spectroscopy has been used for decades to gather valuable information about the electronic density of states and the energy gap in superconductors. For thin film materials, this has, for the most part, only been poss…
View article: Discovery of charge order in a cuprate Mott insulator
Discovery of charge order in a cuprate Mott insulator Open
Copper oxide superconductors universally exhibit multiple forms of electronically ordered phases that break the native translational symmetry of the CuO 2 planes. In underdoped cuprates with correlated metallic ground states, charge/spin s…
View article: High-Temperature Superconductor Quantum Flux Parametron for Energy-Efficient Logic
High-Temperature Superconductor Quantum Flux Parametron for Energy-Efficient Logic Open
As we rapidly advance through the information age, the power consumed by computers, data centers, and networks grows exponentially. This has inspired a race to develop alternative low-power computational technologies. A new adiabatic confi…
View article: Method for fabricating superconducting devices using a focused ion beam
Method for fabricating superconducting devices using a focused ion beam Open
Nano-scale junctions, wires, and junction arrays are created by using a focused high-energy ion beam to direct-write insulating or poorly conducting barriers into thin films of materials that are sensitive to disorder, including supercondu…
View article: Ion beam mill etch depth monitoring with nanometer-scale resolution
Ion beam mill etch depth monitoring with nanometer-scale resolution Open
A method for measuring conductance of a material real-time during etching/milling includes providing a fixture having a socket for receiving the material. The socket is attached to a printed circuit board (PCB) mounted on one side of a pla…
View article: Superconducting disordered neural networks for neuromorphic processing with fluxons
Superconducting disordered neural networks for neuromorphic processing with fluxons Open
In superconductors, magnetic fields are quantized into discrete fluxons (flux quanta Φ 0 ), made of microscopic circulating supercurrents. We introduce a multiterminal synapse network comprising a disordered array of superconducting loops …
View article: Discovery of an electronic crystal in a cuprate Mott insulator
Discovery of an electronic crystal in a cuprate Mott insulator Open
Copper oxide high temperature superconductors universally exhibit multiple forms of electronically ordered phases that break the native translational symmetry of the CuO2 planes. The interplay between these orders and the superconducting g…
View article: High-transition-temperature nanoscale superconducting quantum interference devices directly written with a focused helium ion beam
High-transition-temperature nanoscale superconducting quantum interference devices directly written with a focused helium ion beam Open
In this work, we present nanoscale superconducting quantum interference devices (SQUIDs) with dimensions as small as 10 nm from the high-transition-temperature superconductor YBa2Cu3O7−δ (YBCO). The SQUID features and Josephson junctions a…
View article: Nanoscale High Transition Temperature Superconducting Quantum Interference Device Transimpedance Amplifier
Nanoscale High Transition Temperature Superconducting Quantum Interference Device Transimpedance Amplifier Open
As the quantum generation of electronics takes the stage, a cast of important support electronics is needed to connect these novel devices to our classical worlds. In the case of superconducting electronics, this is a challenge because the…
View article: Series arrays of planar long Josephson junctions for high dynamic range magnetic flux detection
Series arrays of planar long Josephson junctions for high dynamic range magnetic flux detection Open
We investigated series arrays of closely spaced, planar long Josephson junctions for magnetic field transduction in Earth’s field, with a linear response and high dynamic range. The devices were fabricated from thin film high-temperature s…
View article: Direct-Write Ion Beam Irradiated Josephson Junctions
Direct-Write Ion Beam Irradiated Josephson Junctions Open
We highlight the reproducibility and level of control over the electrical properties of YBa$_2$Cu$_3$O$_7$ Josephson junctions fabricated with irradiation from a focused helium ion beam. Specifically, we show the results of electrical tran…
View article: Investigation of Arrays of Two-Dimensional High-$T_\text{C}$ SQUIDs for Optimization of Electrical Properties
Investigation of Arrays of Two-Dimensional High-$T_\text{C}$ SQUIDs for Optimization of Electrical Properties Open
In this work, we investigate two-dimensional arrays of High-T C superconducting quantum interference devices (SQUIDs) for optimization of their electrical transport characteristics. Specifically, we look at devices with different electrode…
View article: Direct-coupled micro-magnetometer with Y-Ba-Cu-O nano-slit SQUID fabricated with a focused helium ion beam
Direct-coupled micro-magnetometer with Y-Ba-Cu-O nano-slit SQUID fabricated with a focused helium ion beam Open
Direct write patterning of high-transition temperature (high-TC) superconducting oxide thin films with a focused helium ion beam is a formidable approach for the scaling of high-TC circuit feature sizes down to the nanoscale. In this lette…
View article: The effects of annealing a 2-dimensional array of ion-irradiated Josephson junctions
The effects of annealing a 2-dimensional array of ion-irradiated Josephson junctions Open
We have fabricated the two-dimensional arrays of superconducting quantum interference devices (SQUIDs) using YBa2Cu3O7-δ ion-irradiated Josephson junctions, and we have studied the effects of post-annealing the arrays at 100 ◦C in oxygen. …
View article: Application of Focused Helium Ion Beams for Direct-write Lithography of Superconducting Electronics
Application of Focused Helium Ion Beams for Direct-write Lithography of Superconducting Electronics Open
Journal Article Application of Focused Helium Ion Beams for Direct-write Lithography of Superconducting Electronics Get access Shane Cybart, Shane Cybart Oxide Nano Electronics Laboratory, Department of Physics, University of California Sa…
View article: Superconducting Nano Wire Circuits Fabricated using a Focused Helium Beam
Superconducting Nano Wire Circuits Fabricated using a Focused Helium Beam Open
Journal Article Superconducting Nano Wire Circuits Fabricated using a Focused Helium Beam Get access E Y Cho, E Y Cho Oxide Nano Electronics Laboratory, Department of Physics, University of California, San Diego, La Jolla, California USA S…
View article: YBa2Cu3O7−<i>δ</i> superconducting quantum interference devices with metallic to insulating barriers written with a focused helium ion beam
YBa2Cu3O7−<i>δ</i> superconducting quantum interference devices with metallic to insulating barriers written with a focused helium ion beam Open
In this work, we demonstrate the ability to fabricate superconducting quantum interference devices (SQUIDs) by directly writing Josephson junctions into the plane of YBa2Cu3O7−δ thin films with a focused helium ion beam. This technique all…
View article: Nanometer scale high-aspect-ratio trench etching at controllable angles using ballistic reactive ion etching
Nanometer scale high-aspect-ratio trench etching at controllable angles using ballistic reactive ion etching Open
We demonstrate a low pressure reactive ion etching process capable of patterning nanometer scale angled sidewalls and three dimensional structures in photoresist. At low pressure the plasma has a large dark space region where the etchant i…