Peter A. van Aken
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View article: Growth of tetragonal PtO by molecular-beam epitaxy and its integration into β-Ga2O3 Schottky diodes
Growth of tetragonal PtO by molecular-beam epitaxy and its integration into β-Ga2O3 Schottky diodes Open
We demonstrate the epitaxial growth of tetragonal platinum monoxide (PtO) on MgO, TiO2, and β-Ga2O3 single-crystalline substrates by ozone molecular-beam epitaxy. We provide synthesis routes and derive a growth diagram under which PtO film…
View article: Structural order differentiation unlocks the energy storage performance of commensurate antiferroelectric ceramics
Structural order differentiation unlocks the energy storage performance of commensurate antiferroelectric ceramics Open
View article: Floating zone growth of large tetragonal Ruddlesden-Popper bilayer nickelate YySr3−yNi2−xAlxO7−δ single crystals
Floating zone growth of large tetragonal Ruddlesden-Popper bilayer nickelate YySr3−yNi2−xAlxO7−δ single crystals Open
The discovery of superconductivity under high pressure in Ruddlesden-Popper (RP) type phase bilayer $${{{{\rm{La}}}}}_{3}{{{{\rm{Ni}}}}}_{2}^{2.5+}{{{{\rm{O}}}}}_{7}$$ and trilayer $${{{{\rm{La}}}}}_{4}{{{{\rm{Ni}}}}}_{3…
View article: A universal method for in situ control of stoichiometry and termination of epitaxial perovskite films
A universal method for in situ control of stoichiometry and termination of epitaxial perovskite films Open
View article: Nonlinear Optical Response in Layer‐Stacked Gallenene with Ferroelectric Polarization
Nonlinear Optical Response in Layer‐Stacked Gallenene with Ferroelectric Polarization Open
Polar metals are very rare and challenging to realize due to the incompatibility of ferroelectricity and metallicity. Mobile electrons in polar metals effectively screen the static electric field and dipoles. Recent studies show that 2D va…
View article: Anomalous Sodium Insertion in Highly Oriented Graphite: Thermodynamics, Kinetics and Evidence for Two-Sided Intercalation
Anomalous Sodium Insertion in Highly Oriented Graphite: Thermodynamics, Kinetics and Evidence for Two-Sided Intercalation Open
The difficult intercalation of sodium (Na) into graphite is studied by systematic and long-time investigations (of up to 2 years) using highly oriented pyrolytic graphite (HOPG). By studying chemical insertion of solid, liquid and gaseous …
View article: Multiorbital character of the density wave instability in La$_4$Ni$_3$O$_{10}$
Multiorbital character of the density wave instability in La$_4$Ni$_3$O$_{10}$ Open
Ruddlesden-Popper nickelates exhibit high-temperature superconductivity closely intertwined with charge and spin density wave order. However, fundamental questions persist regarding the interplay between the associated density wave (DW) fl…
View article: DNA moiré superlattices
DNA moiré superlattices Open
View article: Enhanced Photothermal Conversion through 2D/0D Nano-Heterojunction Engineering for Highly Efficient Solar Desalination
Enhanced Photothermal Conversion through 2D/0D Nano-Heterojunction Engineering for Highly Efficient Solar Desalination Open
Two-dimensional (2D) materials are promising candidates for solar-driven desalination. However, conventional photothermal 2D materials like transition metal carbides and nitrides (MXenes) as well as transition metal dichalcogenides (TMDs) …
View article: Atomic‐Scale Mechanisms of Nucleation and Stabilization in CuCrO<sub>2</sub> and CuFeO<sub>2</sub> Delafossite Thin Films on Al<sub>2</sub>O<sub>3</sub>
Atomic‐Scale Mechanisms of Nucleation and Stabilization in CuCrO<sub>2</sub> and CuFeO<sub>2</sub> Delafossite Thin Films on Al<sub>2</sub>O<sub>3</sub> Open
Delafossite thin films exhibit a range of intriguing physical properties derived from their layered structure, which consists of alternating noble metal ( A + ) and ( B O 2 − ) sublayers in an AB O 2 stoichiometry. The integration of these…
View article: Unveiling the Interfacial Reconstruction Mechanism Enabling Stable Growth of the Delafossite PdCoO<sub>2</sub> on Al<sub>2</sub>O<sub>3</sub> and LaAlO<sub>3</sub>
Unveiling the Interfacial Reconstruction Mechanism Enabling Stable Growth of the Delafossite PdCoO<sub>2</sub> on Al<sub>2</sub>O<sub>3</sub> and LaAlO<sub>3</sub> Open
Delafossites, composed of noble metal (A+) and strongly correlated sublayers (BO2-), form natural superlattices with highly anisotropic properties. These properties hold significant promise fo…
View article: Atomic-scale observation of geometric reconstruction in a fluorine-intercalated infinite layer nickelate superlattice
Atomic-scale observation of geometric reconstruction in a fluorine-intercalated infinite layer nickelate superlattice Open
Anion doping offers immense potential for tailoring material properties, but precise control over anion incorporation remains challenging due to complex synthesis and limitations in dopant detection. This study investigates F-ion intercala…
View article: Ultrafast phonon-mediated dephasing of color centers in hexagonal boron nitride probed by electron beams
Ultrafast phonon-mediated dephasing of color centers in hexagonal boron nitride probed by electron beams Open
View article: Magnetotransport Properties in Epitaxial Films of Metallic Delafossite PdCoO$_2$: Effects of Thickness and Width Variations in Hall Bar Devices
Magnetotransport Properties in Epitaxial Films of Metallic Delafossite PdCoO$_2$: Effects of Thickness and Width Variations in Hall Bar Devices Open
We report on a combined structural and magnetotransport study of Hall bar devices of various lateral dimensions patterned side-by-side on epitaxial PdCoO$_2$ thin films. We study the effects of both the thickness of the PdCoO$_2$ film and …
View article: Unveiling the Interfacial Reconstruction Mechanism Enabling Stable Growth of the Delafossite PdCoO2 on Al2O3 and LaAlO3
Unveiling the Interfacial Reconstruction Mechanism Enabling Stable Growth of the Delafossite PdCoO2 on Al2O3 and LaAlO3 Open
Delafossites, comprised of noble metal (A+) and strongly correlated sublayers (BO2-), form natural superlattices with highly anisotropic properties. These properties hold significant promise for various applications, but their exploitation…
View article: Direct Evidence of Anomalous Peierls Transition-Induced Charge Density Wave Order at Room Temperature in Metallic NaRu2O4
Direct Evidence of Anomalous Peierls Transition-Induced Charge Density Wave Order at Room Temperature in Metallic NaRu2O4 Open
In the field of quantum materials, understanding anomalous behavior under charge degrees of freedom through bond formation is of fundamental importance, with two key concepts: Dimerization and charge order at different cation sites. The co…
View article: Nitride thin films grown by thermal laser epitaxy
Nitride thin films grown by thermal laser epitaxy Open
The growth of a wide range of binary nitride films with excellent properties is reported. These films are deposited by thermal laser epitaxy (TLE). If equipped with CO2–laser substrate heating, TLE allows growth temperatures ≫ 1000 °C comb…
View article: Plasmonic and Photonic Modes in Colloidal CuS Nanocrystals
Plasmonic and Photonic Modes in Colloidal CuS Nanocrystals Open
Copper monosulfide (CuS), also known as covellite, displays exceptional optoelectronic characteristics, exhibiting both plasmonic and photonic absorption in its monolithic nanomaterial form. It is classified as a hybrid metallic‐semiconduc…
View article: Nonlinear optical response and spontaneous polarization in layer-stacked gallenene using second harmonic generation
Nonlinear optical response and spontaneous polarization in layer-stacked gallenene using second harmonic generation Open
Gallenene is a promising low-dimensional material with a structure down to the thickness of a single atom, similar to graphene. However, van der Waals stacking of two-dimensional (2D) gallenene under confinement remain poorly understood. I…
View article: Imaging atomic-scale magnetism with energy-filtered differential phase contrast method
Imaging atomic-scale magnetism with energy-filtered differential phase contrast method Open
We propose differential phase contrast (DPC) imaging using energy-filtered electrons to image the magnetic properties of materials at the atomic scale. Compared to DPC measurements with elastic electrons, our simulations predict about two …
View article: Unlocking Unexpected Charge Transfer Pathways in Interconnected Nanostructures
Unlocking Unexpected Charge Transfer Pathways in Interconnected Nanostructures Open
Accurate control of charge transfer pathways is critical to unlocking the full potential of charge transfer plasmons (CTPs) and exploring their diverse applications. We show that the intentional manipulation of junctions in Al nanocrosses …
View article: Unconventional Crystal Structure of the High-Pressure Superconductor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>La</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:msub><mml:mrow><mml:mi>Ni</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Unconventional Crystal Structure of the High-Pressure Superconductor Open
The discovery of high-temperature superconductivity in La3Ni2O7 at pressures above 14 GPa has spurred extensive research efforts. Yet, fundamental aspects of the superconducting phase, including the possibility of a filamentary character, …
View article: Fully Transparent Epitaxial Oxide Thin‐Film Transistor Fabricated at Back‐End‐of‐Line Temperature by Suboxide Molecular‐Beam Epitaxy
Fully Transparent Epitaxial Oxide Thin‐Film Transistor Fabricated at Back‐End‐of‐Line Temperature by Suboxide Molecular‐Beam Epitaxy Open
Transparent oxide thin film transistors (TFTs) are an important ingredient of transparent electronics. Their fabrication at the back‐end‐of‐line (BEOL) opens the door to novel strategies to more closely integrate logic with memory for data…
View article: Adsorption-controlled growth of homoepitaxial <i>c</i>-plane sapphire films
Adsorption-controlled growth of homoepitaxial <i>c</i>-plane sapphire films Open
Sapphire is a technologically highly relevant material, but it poses many challenges when performing epitaxial thin-film deposition. We have identified and applied the conditions for adsorption-controlled homoepitaxial growth of c-plane sa…
View article: Unraveling nano-scale effects of topotactic reduction in LaNiO2 crystals
Unraveling nano-scale effects of topotactic reduction in LaNiO2 crystals Open
Infinite-layer nickelates stand as a promising frontier in the exploration of unconventional superconductivity. Their synthesis through topotactic oxygen reduction from the parent perovskite phase remains a complex and elusive process. Thi…
View article: <i>α</i>-Ta films on <i>c</i>-plane sapphire with enhanced microstructure
<i>α</i>-Ta films on <i>c</i>-plane sapphire with enhanced microstructure Open
Superconducting films of α-Ta are promising candidates for the fabrication of advanced superconducting qubits. However, α-Ta films suffer from many growth-induced structural inadequacies that negatively affect their performance. We have th…
View article: Imaging atomic-scale magnetism with energy-filtered differential phase contrast method
Imaging atomic-scale magnetism with energy-filtered differential phase contrast method Open
We propose differential phase contrast (DPC) imaging using energy-filtered electrons to image the magnetic properties of materials at the atomic scale. Compared to DPC measurements with elastic electrons, our simulations predict about two …
View article: Atomic-scale observation of geometric frustration in a fluorine-intercalated infinite layer nickelate superlattice
Atomic-scale observation of geometric frustration in a fluorine-intercalated infinite layer nickelate superlattice Open
Anion doping offers immense potential for tailoring material properties, but achieving precise control over anion incorporation remains a challenge due to complex synthesis processes and limitations in local dopant detection. Here, we inve…
View article: Surface reconstructions and electronic structure of metallic delafossite thin films
Surface reconstructions and electronic structure of metallic delafossite thin films Open
The growing interest in the growth and study of thin films of low-dimensional metallic delafossites, with the general formula ABO2, is driven by their potential to exhibit electronic and magnetic characteristics that are not accessible in …
View article: Plasmon‐Enhanced Light Absorption Below the Bandgap of Semiconducting SnS<sub>2</sub> Microcubes for Highly Efficient Solar Water Evaporation
Plasmon‐Enhanced Light Absorption Below the Bandgap of Semiconducting SnS<sub>2</sub> Microcubes for Highly Efficient Solar Water Evaporation Open
Semiconducting materials show high potential for solar energy harvesting due to their suitable bandgaps, which allow the efficient utilization of light energy larger than their bandgaps. However, the photon energy smaller than their bandga…