George R. Rossman

Electrically reconfigurable polarization control with double tri-layer black phosphorus heterostructures

Samuel K. W. Seah, Souvik Biswas, Claudio U. Hail, George R. Rossman et autres

Accessing diverse polarization states across the Poincaré sphere via electrical control is highly desirable in optical communications, bio-imaging and quantum information processing, where fast continuous switching, compactness, and ease of integration into photonikic circuits are essential. Layered anisotropic 2D materials enable polarization …

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Preparation and evaluation of alexandrite, forsterite, and topaz substrates for the epitaxial growth of rutile oxides

Monique Kubovsky, Yorick A. Birkhölzer, Luka Mitrovic, Hanjong Paik et autres

Metal–insulator transitions and superconductivity in rutile-structured oxides hold promise for advanced electronic applications, yet their thin film synthesis is severely hindered by limited substrate options. Here, we present three single-crystalline substrates, BeAl2O4, Mg2SiO4, and Al2SiO4(F,OH)2, prepared via optimized thermal and chemical treatments …

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Dataset: Preparation and evaluation of alexandrite, forsterite, and topaz substrates for the epitaxial growth of rutile oxides

Monique Kubovsky, Yorick A. Birkhölzer, Luka Mitrovic, Hanjong Paik et autres

Vibrational spectroscopy of dense oxyhydroxides: Hydrogen bond disorder and symmetrization at high pressure

Benjamin Strozewski, Zhenxian Liu, George R. Rossman, W. Sturhahn et autres

Abstract Earth’s lower mantle is often considered to be “dry” on the basis of hydrogen storage capacities of nominally anhydrous minerals. Recent investigations of dense oxyhydroxides in the (δ-AlOOH)-[MgSiO2(OH)2]-(ε-FeOOH) system have revealed that these phases may carry hydrogen into the lowermost mantle …

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Geophysical Impacts and Spectroscopic Identification of a Hydrous Iron Sulfate on Icy Worlds

Olivia S. Pardo, William R. Palfey, Zhenxian Liu, W. A. III GODDARD et autres

Abstract Over geologic time‐scales, large volumes of exogenic sulfur ions from Io's plasma torus have been supplied to the surface of Europa and Ganymede, which, combined with recent interpretations of orbiter images, dynamical modeling, and surface‐subsurface exchange, suggests further sulfur transport into …

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Different crystallization events of Li-bearing pegmatitic tourmaline from San Piero in Campo, Elba Island, Italy

Andreas Ertl, Federicο Pezzotta, John M. Hughes, Hans‐Peter Meyer et autres

To learn more about the growth zones of distinctly zoned tourmalines from the well-studied Rosina aplite–pegmatite dike of the Monte Capanne pluton near San Piero in Campo, Elba Island, Italy, four tourmaline crystals rooted in the pegmatitic rock and developed into three …

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Preparation and evaluation of alexandrite, forsterite, and topaz substrates for the epitaxial growth of rutile oxides

Monique Kubovsky, Yorick A. Birkhölzer, Luka B. Mitrovic, Hanjong Paik et autres

Metal-insulator transitions and superconductivity in rutile-structured oxides hold promise for advanced electronic applications, yet their thin film synthesis is severely hindered by limited substrate options. Here, we present three single- crystalline substrates, BeAl2O4, Mg2SiO4, and Al2SiO4(F,OH)2, prepared via optimized thermal and chemical …

Fe-Ti vs. Fe-Fe charge transfers: A comprehensive review and its applications in minerals and glasses

Maxence Vigier, Helen F Evans, George R. Rossman, Stéphane Jobic et autres

Abstract Iron-titanium (Fe-Ti) charge transfer is mentioned in numerous articles as the source of the coloration of many natural minerals and some manufactured materials, but no global review of this phenomenon has been provided so far. Iron and titanium are ubiquitous in …

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Application of optical photothermal infrared spectroscopy (O-PTIR) for future returned Mars samples

Nicholas A. Heinz, Mark S. Anderson, Jerami Mennella, George R. Rossman

Optical photothermal infrared spectroscopy (O-PTIR) was used to characterize a terrestrial rock sample as a demonstration of the technique's enhanced spatial resolution as it corresponds to minerology and the detection of organics. Traditional reflectance-based infrared techniques are limited by the wavelength of …

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Porous Silica Scaffolds Enable Mechanically Robust Simulated Hydrothermal Chimney Growth

Seneca J. Velling, Jessica M. Weber, John‐Paul Jones, Alex Wertheim et autres

Injection chemical garden experiments have been used to produce laboratory analogs to seafloor hydrothermal chimneys on Earth and ocean worlds. These systems form self-assembled inorganic membranes via precipitation of metal oxyhydroxides, silicates, and/or sulfides when a hydrothermal fluid simulant is slowly injected …

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Fe2+/Fe3+ intervalence charge transfer and enhanced d-d absorption in mixed-valence iron minerals at elevated temperatures

Helen V. Evans, George R. Rossman

Abstract The absorption of light by Fe/Ti and Fe/Fe intervalence charge transfer (IVCT) bands has previously been found in aluminum oxide and Al2SiO5 aluminosilicate minerals to decrease markedly at elevated temperatures. Given the abundance of iron at depth in the Earth, assessing …

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A New Spectral Library for Modeling the Surfaces of Hot, Rocky Exoplanets

Kimberly Paragas, Heather A. Knutson, Renyu Hu, Bethany L. Ehlmann et autres

Abstract JWST’s MIRI LRS provides the first opportunity to spectroscopically characterize the surface compositions of close-in terrestrial exoplanets. Models for the bare-rock spectra of these planets often utilize a spectral library from R. Hu et al., which is based on room-temperature reflectance …