X-ray Nano-imaging of Defects in Thin Film Catalysts via Cluster Analysis

Kavli Affiliate: Jin Suntivich | First 5 Authors: Aileen Luo, Oleg Yu. Gorobtsov, Jocienne N. Nelson, Ding-Yuan Kuo, Ziming Shao | Summary: Functional properties of transition-metal oxides strongly depend on crystallographic defects. In transition-metal-oxide electrocatalysts such as SrIrO3 (SIO), crystallographic lattice deviations can affect ionic diffusion and adsorbate binding energies. Scanning x-ray nanodiffraction enables imaging […]


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Character of the “normal state” of the nickelate superconductors

Kavli Affiliate: Lena F. Kourkoutis | First 5 Authors: Kyuho Lee, Bai Yang Wang, Motoki Osada, Berit H. Goodge, Tiffany C. Wang | Summary: The occurrence of superconductivity in proximity to various strongly correlated phases of matter has drawn extensive focus on their normal state properties, to develop an understanding of the state from which […]


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Imaging Atomic-Scale Chemistry from Fused Multi-Modal Electron Microscopy

Kavli Affiliate: Richard D. Robinson | First 5 Authors: Jonathan Schwartz, Zichao Wendy Di, Yi Jiang, Alyssa J. Fielitz, Don-Hyung Ha | Summary: Efforts to map atomic-scale chemistry at low doses with minimal noise using electron microscopes are fundamentally limited by inelastic interactions. Here, fused multi-modal electron microscopy offers high signal-to-noise ratio (SNR) recovery of […]


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Pervasive beyond room-temperature ferromagnetism in a doped van der Waals magnet: Ni doped Fe$_5$GeTe$_2$ with $T_{text{C}}$ up to 478 K

Kavli Affiliate: David A. Muller | First 5 Authors: Xiang Chen, Yu-Tsun Shao, Rui Chen, Sandhya Susarla, Tom Hogan | Summary: The existence of long range magnetic order in low dimensional magnetic systems, such as the quasi-two-dimensional (2D) van der Waals (vdW) magnets, has attracted intensive studies of new physical phenomena. The vdW Fe$_N$GeTe$_2$ ($N$ […]


Continue.. Pervasive beyond room-temperature ferromagnetism in a doped van der Waals magnet: Ni doped Fe$_5$GeTe$_2$ with $T_{text{C}}$ up to 478 K

Universal scaling for disordered viscoelastic matter II: Collapses, global behavior and spatio-temporal properties

Kavli Affiliate: Itai Cohen | First 5 Authors: Danilo B. Liarte, Stephen J. Thornton, Eric Schwen, Itai Cohen, Debanjan Chowdhury | Summary: Disordered viscoelastic materials are ubiquitous and exhibit fascinating invariant scaling properties. In a companion article, we have presented comprehensive new results for the critical behavior of the dynamic susceptibility of disordered elastic systems […]


Continue.. Universal scaling for disordered viscoelastic matter II: Collapses, global behavior and spatio-temporal properties

Memory Defense: More Robust Classification via a Memory-Masking Autoencoder

Kavli Affiliate: Dan Luo | First 5 Authors: Eashan Adhikarla, Dan Luo, Brian D. Davison, , | Summary: Many deep neural networks are susceptible to minute perturbations of images that have been carefully crafted to cause misclassification. Ideally, a robust classifier would be immune to small variations in input images, and a number of defensive […]


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Tunable bilayer Hubbard model physics in twisted WSe2

Kavli Affiliate: Jie Shan | First 5 Authors: Yang Xu, Kaifei Kang, Kenji Watanabe, Takashi Taniguchi, Kin Fai Mak | Summary: Moir’e materials with flat electronic bands provide a highly controllable quantum system for studies of strong-correlation physics and topology. In particular, angle-aligned heterobilayers of semiconducting transition metal dichalcogenides (TMDs) with large band offset realize […]


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Dielectric catastrophe at the Mott and Wigner transitions in a moiré superlattice

Kavli Affiliate: Jie Shan | First 5 Authors: Yanhao Tang, Jie Gu, Song Liu, Kenji Watanabe, Takashi Taniguchi | Summary: The metal-insulator transition (MIT) driven by electronic correlations is a fundamental and challenging problem in condensed-matter physics. Particularly, whether such a transition can be continuous remains open. The emergence of semiconducting moir’e materials with continuously […]


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Van der Waals pi Josephson junctions

Kavli Affiliate: Jie Shan | First 5 Authors: Kaifei Kang, Helmuth Berger, Kenji Watanabe, Takashi Taniguchi, Laszlo Forro | Summary: Proximity-induced superconductivity in a ferromagnet can induce Cooper pairs with a finite center-of-mass momentum. The resultant spatially modulated superconducting order parameter is able to stabilize Josephson junctions (JJs) with pi phase difference in superconductor-ferromagnet heterostructures […]


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Strain-induced orbital energy shift in antiferromagnetic RuO2 revealed by resonant elastic x-ray scattering

Kavli Affiliate: Darrell G. Schlom | First 5 Authors: Benjamin Gregory, Jörg Strempfer, Daniel Weinstock, Jacob Ruf, Yifei Sun | Summary: In its ground state, RuO2 was long thought to be an ordinary metallic paramagnet. Recent neutron and x-ray diffraction revealed that bulk RuO2 is an antiferromagnet (AFM) with TN above 300 K. Furthermore, epitaxial […]


Continue.. Strain-induced orbital energy shift in antiferromagnetic RuO2 revealed by resonant elastic x-ray scattering