Michael Köehler

Amplification of valley polarization in an hBN-separated MoSe 2 − WSe 2 heterostructure

Anonymous, Jacob Cutshall, Daniel Shanks, Garett Reichenbach et autres

us, jp (code pays fourni par la source)

Crystallizing Electrons with Artificially Patterned Lattices

Trevor G. Stanfill, Daniel N. Shanks, Michael Köehler, David Mandrus et autres

Wigner crystals are typically confined to ultralow temperatures where thermal motion is frozen out. Moiré superlattices in twisted two-dimensional materials have extended their stability to higher temperatures and densities but rely on delicate stacking that fixes the lattice geometry and limits tunability. …

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Crystallizing electrons with artificially patterned lattices

Trevor G. Stanfill, Daniel N. Shanks, Michael Köehler, David G. Mandrus et autres

Wigner crystals are typically confined to ultralow temperatures where thermal motion is frozen out. Moiré superlattices in twisted two-dimensional materials have extended their stability to higher temperatures and densities, but rely on delicate stacking that fixes the lattice geometry and limits tunability. …

Czochralski Growth and Characterization of a Compositionally Complex Rare Earth Aluminum Garnet Scintillator: (Gd 1/4 Y 1/4 Tb 1/4 Lu 1/4 ) 3 Al 5 O 12 :Ce

Rebecca A. Lalk, Arjen van Veelen, Yauhen Tratsiak, Aya Rutherford et autres

Compositionally complex oxides have garnered increasing interest for their enhanced phase stability and tunable functional properties, yet their development as bulk single crystal scintillators remains limited. Herein, we report the Czochralski growth and characterization of (Gd 1/4 Y 1/4 Tb 1/4 Lu …

in, us (code pays fourni par la source)

Advanced Echo-planar Parallel Imaging with Gradient Harmonization (AEPIG): an optimization strategy for fast high resolution fMRI

Michael Köehler, Rüdiger Stirnberg, Jennifer Evans, Lasse Knudsen et autres

Motivation: Sub-millimeter resolution fMRI with large coverage of the brain is limited by relatively long acquisition times. Shorter TRs with very high GRAPPA factors>8 are challenged by image artifacts. Goal(s): We aim to develop, optimize, and validate highly accelerated Cartesian EPI protocols …

Cryogenic Nano-Imaging of Excitons in a Monolayer Semiconductor

Anna Roche, Michael Köehler, David Mandrus, Takashi Taniguchi et autres

Optical measurements of 2D semiconductors have primarily relied on far-field spectroscopy techniques, which are diffraction limited to several hundred nanometers. Precisely imaging nanoscale spatial disorder requires an order of magnitude increase in resolution capabilities. Here, we present a spatially resolved study of …

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Polyethylene Upcycling to Liquid Alkanes in Molten Salts under Neat and External Hydrogen Source-Free Conditions

Liqi Qiu, Felipe Polo‐Garzon, Luke L. Daemen, Min-Jae Kim et autres

Development of facile approaches to convert plastic waste into liquid fuels under neat conditions is highly desired but challenging, particularly without noble metal catalysts and an external hydrogen source. Herein, highly efficient and selective polyethylene-to-gasoline oil (branched C 6 –C 12 alkanes) …

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Imaging interlayer exciton superfluidity in a 2D semiconductor heterostructure

Jacob Cutshall, Fateme Mahdikhanysarvejahany, Anna Roche, Daniel N. Shanks et autres

Excitons, which are Coulomb bound electron-hole pairs, are composite bosons and thus at low temperature can form a superfluid state with a single well-defined amplitude and phase. We directly image this macroscopic exciton superfluid state in an hBN-separated MoSe 2 -WSe 2 …

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Data quality in laboratory convergent-beam X-ray total scattering

Peter Metz, Michael Köehler, Katharine Page

Measurement of laboratory atomic pair distribution function data has improved with contemporary X-ray sources, optics and detectors, with acquisition times of the order of minutes for ideal samples. This paper examines resolution effects in pair distribution function data obtained using a convergent-beam …

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Compatibility of LaFe13−x−yMnxSiyH1.6 and Eutectic Liquid GaInSn Alloy

Jamieson Brechtl, Joe Rendall, Mingkan Zhang, Michael Köehler et autres

The heat transfer rate of magnetocaloric regenerators is a topic of extensive research and the cyclability of these regenerators is critical to the operation of systems with a high coefficient of performance (e.g., potentially >22, significantly higher than typical vapor compression cooling …

us (code pays fourni par la source)

Ultra-broadband bright light emission from a one-dimensional inorganic van der Waals material

Fateme Mahdikhany, Sean Driskill, Jeremy G. Philbrick, Davoud Adinehloo et autres

One-dimensional (1D) van der Waals materials have emerged as an intriguing playground to explore novel electronic and optical effects. We report on inorganic one-dimensional SbPS4 nanotube bundles obtained via mechanical exfoliation from bulk crystals. The ability to mechanically exfoliate SbPS4 nanobundles offers …

us, jp (code pays fourni par la source)

Ultra-broadband bright light emission from a one-dimensional inorganic van der Waals material

Fateme Mahdikhany, Sean Driskill, Jeremy G. Philbrick, Davoud Adinehloo et autres

One-dimensional (1D) van der Waals materials have emerged as an intriguing playground to explore novel electronic and optical effects. We report on inorganic one-dimensional SbPS4 nanotubes bundles obtained via mechanical exfoliation from bulk crystals. The ability to mechanically exfoliate SbPS4 nanobundles offers …