David Lederman
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View article: Suppression of Thermal Conductivity via Singlet-Dominated Scattering in TmFeO$_3$
Suppression of Thermal Conductivity via Singlet-Dominated Scattering in TmFeO$_3$ Open
We measured the thermal conductivity of the rare-earth orthoferrites, $R$FeO$_3$, where $R$ = Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb and see an anomalous strong suppression for TmFeO$_3$. Using a Debye thermal transport model, we demonstrate t…
View article: Epitaxial Stabilization and Emergent Charge Order in Copper Selenide Thin Films
Epitaxial Stabilization and Emergent Charge Order in Copper Selenide Thin Films Open
We demonstrate epitaxial growth of copper selenide (Cu$_{2-x}$Se) thin films in both cubic and rhombohedral phases, achieved via molecular beam epitaxy on Al$_2$O$_3$ (001) substrates. Remarkably, the high-temperature cubic phase -- which …
View article: Critical slowdown of spontaneous fluctuations in the vicinity of metal-insulator transition in rare earth nickelates
Critical slowdown of spontaneous fluctuations in the vicinity of metal-insulator transition in rare earth nickelates Open
Fluctuations of the order parameter near the phase transition boundary in complex oxides could be key to designing probabilistic bits and stochastic synapses. Direct probes of fluctuations how- ever are non-trivial due to the requirement o…
View article: Engineering strong magnon–phonon coupling in single CoFe nanomagnets
Engineering strong magnon–phonon coupling in single CoFe nanomagnets Open
Hybrid magnonic systems are promising platforms for quantum technologies, leveraging coherent coupling between magnons and phonons. Here, we demonstrate strong magnon–phonon coupling in CoFe nanomagnets, a material with high magnetostricti…
View article: Direct visualization of relativistic quantum scars in graphene quantum dots
Direct visualization of relativistic quantum scars in graphene quantum dots Open
Quantum scars refer to eigenstates with enhanced probability density along unstable classical periodic orbits. First predicted 40 years ago1, scars are special eigenstates that counterintuitively defy ergodicity in quantum systems whose cl…
View article: Direct Visualization of Relativistic Quantum Scars
Direct Visualization of Relativistic Quantum Scars Open
Quantum scars refer to eigenstates with enhanced probability density along unstable classical periodic orbits (POs). First predicted 40 years ago, scars are special eigenstates that counterintuitively defy ergodicity in quantum systems who…
View article: Suppressed weak anti-localization in topological insulator - antiferromagnetic insulator (BiSb)$_2$Te$_3$ - MnF$_2$ thin film bilayers
Suppressed weak anti-localization in topological insulator - antiferromagnetic insulator (BiSb)$_2$Te$_3$ - MnF$_2$ thin film bilayers Open
Thin films of the topological insulator (BiSb)$_2$Te$_3$ oriented along the [0001] direction were grown via molecular beam epitaxy on substrates of Al$_2$O$_3$ (0001) and MgF$_2$ (110) single crystals, as well as on an epitaxial thin film …
View article: Photoinduced structural recovery dynamics of rare-earth nickelate thin films
Photoinduced structural recovery dynamics of rare-earth nickelate thin films Open
Photoinduced structural dynamics of rare-earth nickelate thin films, NdNiO3 and SmNiO3, grown on (001) oriented SrTiO3 were studied using time-resolved x-ray diffraction. The evolution of the (002) Bragg peak was tracked following laser ex…
View article: Emergent Magnetic Phases and Piezomagnetic Effects in Mn$_x$Ni$_{1-x}$F$_2$ Thin Film Alloys
Emergent Magnetic Phases and Piezomagnetic Effects in Mn$_x$Ni$_{1-x}$F$_2$ Thin Film Alloys Open
The effect of random competing single-ion anisotropies in antiferromagnets was studied using epitaxial Mn$_x$Ni$_{1-x}$F$_2$ antiferromagnetic thin film alloys grown via molecular beam epitaxy. The crystal structure of this material is tet…
View article: Geometric influence on the net magnetic moment in LaCoO3 thin films
Geometric influence on the net magnetic moment in LaCoO3 thin films Open
The different magnetic behaviors of LaCoO $$_3$$ films grown on LaAlO $$_3$$ and SrTiO $$_3$$ substrates are related to the Co–O–Co bond angles and the constraints imposed on the Co–O bond lengths by the substrate geometries. The …
View article: Giant orbital magnetic moments and paramagnetic shift in artificial relativistic atoms and molecules
Giant orbital magnetic moments and paramagnetic shift in artificial relativistic atoms and molecules Open
Materials such as graphene and topological insulators host massless Dirac fermions that enable the study of relativistic quantum phenomena. Single quantum dots and coupled quantum dots formed with massless Dirac fermions can be viewed as a…
View article: Observation of Giant Orbital Magnetic Moments and Paramagnetic Shift in Artificial Relativistic Atoms and Molecules
Observation of Giant Orbital Magnetic Moments and Paramagnetic Shift in Artificial Relativistic Atoms and Molecules Open
Massless Dirac fermions have been observed in various materials such as graphene and topological insulators in recent years, thus offering a solid-state platform to study relativistic quantum phenomena. Single quantum dots (QDs) and couple…
View article: Surface state mediated ferromagnetism in Mn$_{0.14}$Bi$_{1.86}$Te$_3$ thin films
Surface state mediated ferromagnetism in Mn$_{0.14}$Bi$_{1.86}$Te$_3$ thin films Open
A spontaneous ferromagnetic moment can be induced in Bi$_{2}$Te$_{3}$ thin films below a temperature T $\approx$ 16 K by the introduction of Mn dopants. We demonstrate that films grown via molecular beam epitaxy with the stoichiometry Mn$_…
View article: Carbonaceous Chondrite Outgassing Experiments: Implications for Methane Replenishment on Titan
Carbonaceous Chondrite Outgassing Experiments: Implications for Methane Replenishment on Titan Open
Titan is the only known moon in the Solar System with a substantial atmosphere of N2 and CH4. However, its origin and evolution are not well understood. Titan’s present amount of atmospheric CH4 was predicted to be destroyed photoche…
View article: Subterahertz spin pumping from an insulating antiferromagnet
Subterahertz spin pumping from an insulating antiferromagnet Open
A spin-pumping antiferromagnet Antiferromagnets have been used in spintronics mainly as a source of the so-called exchange bias. However, they hold promise for a much more active role given that their magnetization dynamics can in principl…
View article: Epitaxial strain and the magnetic properties of canted antiferromagnetic perovskite NaNiF3 thin films
Epitaxial strain and the magnetic properties of canted antiferromagnetic perovskite NaNiF3 thin films Open
The perovskite crystal structure is known to exhibit a multitude of interesting physical phenomena owing to the intricate coupling of the electronic and magnetic properties to the structure. Fluoroperovskites offer an alternative chemistry…
View article: Structural and electrical characterization of polycrystalline NbO2 thin film vertical devices grown on TiN-coated SiO2/Si substrates
Structural and electrical characterization of polycrystalline NbO2 thin film vertical devices grown on TiN-coated SiO2/Si substrates Open
We report on the electrical properties of polycrystalline NbO2 thin film vertical devices grown on TiN coated SiO2/Si substrates using pulsed laser deposition. First, we analyzed the thickness and contact size dependences of threshold swit…
View article: Mapping Electronic State Changes with STEM EBIC
Mapping Electronic State Changes with STEM EBIC Open
Journal Article Mapping Electronic State Changes with STEM EBIC Get access B C Regan, B C Regan Department of Physics & Astronomy and California NanoSystems Institute, University of California, Los Angeles, CA, USA Search for other works b…
View article: Protein bioelectronics: a review of what we do and do not know
Protein bioelectronics: a review of what we do and do not know Open
We review the status of protein-based molecular electronics. First, we define and discuss fundamental concepts of electron transfer and transport in and across proteins and proposed mechanisms for these processes. We then describe the immo…
View article: STEM EBIC Mapping of the Metal-Insulator Transition in Thin-film NbO<sub>2</sub>
STEM EBIC Mapping of the Metal-Insulator Transition in Thin-film NbO<sub>2</sub> Open
This article has been published in a revised form in Microscopy and Microanalysis https://doi.org/10.1017/S1431927617007802. This version is free to view and download for private research and study only. Not for re-distribution, re-sale or…
View article: Weak ferromagnetism and short range polar order in NaMnF3 thin films
Weak ferromagnetism and short range polar order in NaMnF3 thin films Open
The orthorhombically distorted perovskite NaMnF3 has been predicted to become ferroelectric if an a = c distortion of the bulk Pnma structure is imposed. In order to test this prediction, NaMnF3 thin films were grown on SrTiO3 (001) single…
View article: Erratum: “The role of defects in the electrical properties of NbO2 thin film vertical devices” [AIP Advances 6, 125006 (2016)]
Erratum: “The role of defects in the electrical properties of NbO2 thin film vertical devices” [AIP Advances 6, 125006 (2016)] Open
This is an Open Access Article. It is published by AIP Publishing under the Creative Commons Attribution 4.0 International Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/
View article: The role of defects in the electrical properties of NbO2 thin film vertical devices
The role of defects in the electrical properties of NbO2 thin film vertical devices Open
Epitaxial NbO2 thin films were grown on Si:GaN layers deposited on Al2O3 substrates using pulsed laser deposition. Pulsed current-voltage (IV) curves and self-sustained current oscillations were measured across a 31 nm NbO2 film and compar…
View article: Weak ferromagnetism and short range polar order in NaMnF$_3$ thin films
Weak ferromagnetism and short range polar order in NaMnF$_3$ thin films Open
The orthorhombically distorted perovskite NaMnF$_{3}$ has been predicted to become ferroelectric if an $a=c$ distortion of the bulk $Pnma$ structure is imposed. In order to test this prediction, NaMnF$_{3}$ thin films were grown on SrTiO$_…
View article: Identification of photocurrents in topological insulators
Identification of photocurrents in topological insulators Open
Optical injection and detection of charge currents is an alternative to conventional transport and photoemission measurements, avoiding the necessity of invasive contact that may disturb the system being examined. This is a particular conc…
View article: STEM Video of Electronically-Driven Metal-Insulator Transitions in Nanoscale NbO 2 Devices
STEM Video of Electronically-Driven Metal-Insulator Transitions in Nanoscale NbO 2 Devices Open
This paper is closed access. This article has been published in a revised form in Microscopy and Microanalysis https://doi.org/10.1017/S143192761600711X. This version is free to view and download for private research and study only. Not fo…