Jacob Repicky
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View article: Quartz phononic crystal resonators for hybrid acoustic quantum memories
Quartz phononic crystal resonators for hybrid acoustic quantum memories Open
Circuit quantum acoustodynamics systems have emerged as a promising platform for quantum information by coupling superconducting qubits to mechanical resonators, with their long-lived mechanical modes serving as quantum memories. We demons…
View article: Exceeding the Parametric Drive Strength Threshold in Nonlinear Circuits
Exceeding the Parametric Drive Strength Threshold in Nonlinear Circuits Open
Superconducting quantum circuits rely on strong drives to implement fast gates, high-fidelity readout, and state stabilization. However, these drives can induce uncontrolled excitations, so-called "ionization", that compromise the fidelity…
View article: The waves-in-space Purcell effect for superconducting qubits
The waves-in-space Purcell effect for superconducting qubits Open
Quantum information processing, especially with quantum error correction, requires both long-lived qubits and fast, quantum non-demolition readout. In superconducting circuits this leads to the requirement to both strongly couple qubits, s…
View article: An atomically tailored chiral magnet with small skyrmions at room temperature
An atomically tailored chiral magnet with small skyrmions at room temperature Open
Creating materials that do not exist in nature can lead to breakthroughs in science and technology. Magnetic skyrmions are topological excitations that have attracted great attention recently for their potential applications in low power, …
View article: An Atomically Tailored Chiral Magnet with Small Skyrmions at Room Temperature
An Atomically Tailored Chiral Magnet with Small Skyrmions at Room Temperature Open
Creating materials that do not exist in nature can lead to breakthroughs in science and technology. Magnetic skyrmions are topological excitations that have attracted great attention recently for their potential applications in low power, …
View article: Observation of Skyrmion Bubbles in Multilayer [Pt/Co/Cu]n using spin-polarized STM
Observation of Skyrmion Bubbles in Multilayer [Pt/Co/Cu]n using spin-polarized STM Open
Magnetic multilayers are a promising platform for storage and logic devices based on skyrmion spin textures, due to the large materials phase space for tuning properties. Epitaxial superlattice structures of [Pt/Co/Cu]n thin films were gro…
View article: Observation of Skyrmion Bubbles in Multilayer [Pt/Co/Cu]n using spin-polarized STM
Observation of Skyrmion Bubbles in Multilayer [Pt/Co/Cu]n using spin-polarized STM Open
Magnetic multilayers are a promising platform for storage and logic devices based on skyrmion spin textures, due to the large materials phase space for tuning properties. Epitaxial superlattice structures of [Pt/Co/Cu]n thin films were gro…
View article: An Atomically Tailored Chiral Magnet with Small Skyrmions at Room Temperature
An Atomically Tailored Chiral Magnet with Small Skyrmions at Room Temperature Open
Creating materials that do not exist in nature can lead to breakthroughs in science and technology. Magnetic skyrmions are topological excitations that have attracted great attention recently for their potential applications in low power, …
View article: Atomic-scale visualization of topological spin textures in the chiral magnet MnGe
Atomic-scale visualization of topological spin textures in the chiral magnet MnGe Open
Peeking into magnetic textures Topological spin textures hold promise as robust carriers of information and have been observed in bulk materials with a specific crystal structure. One of these materials, manganese germanide (MnGe), exhibit…
View article: Synthesis, Magnetic Properties, and Electronic Structure of Magnetic Topological Insulator MnBi<sub>2</sub>Se<sub>4</sub>
Synthesis, Magnetic Properties, and Electronic Structure of Magnetic Topological Insulator MnBi<sub>2</sub>Se<sub>4</sub> Open
The intrinsic magnetic topological insulators MnBi2Te4 and MnBi2Se4 support novel topological states related to symmetry breaking by magnetic order. Unlike MnBi2Te4, the study of MnBi2Se4 has been inhibited by the lack of bulk crystals, as…
View article: Tunable tunnel barriers in a semiconductor via ionization of individual atoms
Tunable tunnel barriers in a semiconductor via ionization of individual atoms Open
We report scanning tunneling microscopy (STM) studies of individual adatoms deposited on an InSb(110) surface. The adatoms can be reproducibly dropped off from the STM tip by voltage pulses, and impact tunneling into the surface by up to ∼…
View article: Atomic scale visualization of topological spin textures in the chiral magnet MnGe
Atomic scale visualization of topological spin textures in the chiral magnet MnGe Open
Archive of raw scanning tunneling microscopy data, spin polarized STM simulations and micromagnetic modeling of spin textures in MnGe. science.org/doi/10.1126/science.abd9225 [2008.00886] Atomic scale visualization of topological spin text…
View article: Chemical migration and dipole formation at van der Waals interfaces between magnetic transition metal chalcogenides and topological insulators
Chemical migration and dipole formation at van der Waals interfaces between magnetic transition metal chalcogenides and topological insulators Open
Metal and magnetic overlayers alter the surface of the topological insulator\n(TI) bismuth selenide (Bi$_2$Se$_3$) through proximity effects but also by\nchanging the composition and chemical structure of the Bi$_2$Se$_3$\nsub-surface. The…
View article: Tunable control over InSb(110) surface conductance utilizing charged defects
Tunable control over InSb(110) surface conductance utilizing charged defects Open
Individual impurity atoms are playing an increasingly important role in next-generation conventional and quantum devices. We use the tip of a scanning tunneling microscope to deposit individual adatoms on an InSb(110) surface and control t…
View article: Surface Structures of Epitaxial B20 FeGe(-1-1-1) Thin Films via Scanning Tunneling Microscopy
Surface Structures of Epitaxial B20 FeGe(-1-1-1) Thin Films via Scanning Tunneling Microscopy Open
We grew 20-100 nm thick films of B20 FeGe by molecular beam epitaxy and investigated the surface structures via scanning tunneling microscopy. We observed the atomic resolution of each of the four possible chemical layers in FeGe(-1-1-1). …