2.2k citations · 11.7k across the 77 of their papers we have counts for
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High-Temperature ferromagnetism from site-selective filling in (Fe,Ni)GeTe
Tyler L. Werner, Jonathan T. Reichanadter, Xiang Chen +23
The discovery of high-temperature ferromagnetism in the metallic van der Waals (vdW) system FeGeTe has brought two-dimensional (2D) magnets into technologically relevant te…
Nonvolatile Electric-Field Control of Inversion Symmetry
Lucas Caretta, Yu-Tsun Shao, Jia Yu +20
In condensed-matter systems, competition between ground states at phase boundaries can lead to significant changes in material properties under external stimuli, particularly when…
Uncovering Material Deformations via Machine Learning Combined with Four-Dimensional Scanning Transmission Electron Microscopy
Chuqiao Shi, Michael C. Cao, Sarah M. Rehn +5
Understanding lattice deformations is crucial in determining the properties of nanomaterials, which can become more prominent in future applications ranging from energy harvesting…
A room temperature polar ferromagnetic metal
Hongrui Zhang, Yu-Tsun Shao, Rui Chen +15
The advent of long-range magnetic order in non-centrosymmetric compounds has stimulated interest in the possibility of exotic spin transport phenomena and topologically protected s…
Ferroelectricity in Polar ScAlN/GaN Epitaxial Semiconductor Heterostructures
Joseph Casamento, Ved Gund, Hyunjea Lee +11
Room temperature ferroelectricity is observed in lattice-matched ~18% ScAlN/GaN heterostructures grown by molecular beam epitaxy on single-crystal GaN substrates. The epitaxial fil…
Emergence of a noncollinear magnetic state in twisted bilayer CrI3
Yang Xu, Ariana Ray, Yu-Tsun Shao +8
The emergence of two-dimensional (2D) magnetic crystals and moiré engineering has opened the door for devising new magnetic ground states via competing interactions in moiré superl…
Momentum-resolved electronic band structure and offsets in an epitaxial NbN/GaN superconductor/semiconductor heterojunction
Tianlun Yu, John Wright, Guru Khalsa +9
The electronic structure of heterointerfaces play a pivotal role in their device functionality. Recently, highly crystalline ultrathin films of superconducting NbN have been integr…
Electron ptychography achieves atomic-resolution limits set by lattice vibrations
Zhen Chen, Yi Jiang, Yu-Tsun Shao +7
Transmission electron microscopes use electrons with wavelengths of a few picometers, potentially capable of imaging individual atoms in solids at a resolution ultimately set by th…
Transferring Orbital Angular Momentum to an Electron Beam Reveals Toroidal and Chiral Order
Kayla X. Nguyen, Yi Jiang, Michael C. Cao +13
Orbital angular momentum and torque transfer play central roles in a wide range of magnetic textures and devices including skyrmions and spin-torque electronics(1-4). Analogous top…
Revealing the Nanostructure of Mesoporous Fuel Cell Catalyst Supports for Durable, High-Power Performance
Matthew Ko, Elliot Padgett, Venkata Yarlagadda +2
Achieving high power performance and durability with low Pt loadings are critical challenges for proton exchange membrane fuel cells. PtCo catalysts developed on new carbon black s…
-phase Inclusions as Common Defects in Alloyed -(AlGa)O and Doped -GaO Films
Celesta S. Chang, Nicholas Tanen, Vladimir Protasenko +5
-GaO is a promising ultra-wide bandgap semiconductor whose properties can be further enhanced by alloying with Al. Here, using atomic-resolution scanning transmission el…
Adsorption-Controlled Growth of Ga2O3 by Suboxide Molecular-Beam Epitaxy
Patrick Vogt, Felix V. E. Hensling, Kathy Azizie +15
This paper introduces a growth method---suboxide molecular-beam epitaxy (S-MBE)---which enables the growth of Ga2O3 and related materials at growth rates exceeding 1 micrometer per…
Tuning the convergence angle for optimum STEM performance
Matthew Weyland, David A. Muller
The achievable instrumental performance of a scanning transmission electron microscope (STEM) is determined by the size and shape of the incident electron probe. The most important…
Observation of strong bulk damping-like spin-orbit torque in chemically disordered ferromagnetic single layers
Lijun Zhu, Xiyue S. Zhang, David A. Muller +2
Strong damping-like spin-orbit torque (τDL) has great potential for enabling ultrafast energy-efficient magnetic memories, oscillators, and logic. So far, the reported τDL exerted…
Imaging Polarity in Two Dimensional Materials by Breaking Friedel's Law
Pratiti Deb, Michael C. Cao, Yimo Han +5
Friedel's law guarantees an inversion-symmetric diffraction pattern for thin, light materials where a kinematic approximation or a single-scattering model holds. Typically, breakin…
In situ modification of delafossite type PdCoO2 bulk single crystal for reversible hydrogen sorption and fast hydrogen evolution
Guowei Li, Seunghyun Khim, Celesta S. Chang +11
The observation of extraordinarily high conductivity in delafossite-type PdCoO2 is of great current interest, and there is some evidence that electrons behave like a fluid when flo…
Structural Heterogeneity, Ductility, and Glass Forming Ability of Zr-Based Metallic Glasses
Soohyun Im, Pengyang Zhao, Geun Hee Yoo +9
We show the correlation between nanoscale structural heterogeneity and mechanical property and glass forming ability of Zr-based metallic glasses (MGs). Detailed parameters of medi…
Controlled introduction of defects to delafossite metals by electron irradiation
V. Sunko, P. H. McGuinness, C. S. Chang +7
The delafossite metals PdCoO, PtCoO and PdCrO are among the highest conductivity materials known, with low temperature mean free paths of tens of microns in the b…
Disentangling magnetic and grain contrast in polycrystalline FeGe thin films using four-dimensional Lorentz scanning transmission electron microscopy
Kayla X. Nguyen, Xiyue S. Zhang, Emrah Turgut +9
The study of nanoscale chiral magnetic order in polycrystalline materials with a strong Dzyaloshinkii-Moriya interaction (DMI) is interesting for the observation of magnetic phenom…
Revealing the nanoparticle composition of Edvard Munch's The Scream, and implications for paint alteration in iconic early 20th century artworks
Barnaby D. A. Levin, Adam C. Finnefrock, Alyssa M. Hull +7
A major motivation for the scientific study of artworks is to understand their states of preservation and ongoing degradation mechanisms. This enables preservation strategies to be…
Unusual Formation of Point Defect Complexes in the Ultra-wide Band Gap Semiconductor beta-Ga2O3
Jared M. Johnson, Zhen Chen, Joel B. Varley +10
Understanding the unique properties of ultra-wide band gap semiconductors requires detailed information about the exact nature of point defects and their role in determining the pr…
Scaling-up atomically thin coplanar semiconductor-metal circuitry via phase engineered chemical assembly
Xiaolong Xu, Shuai Liu, Bo Han +11
Two-dimensional (2D) layered semiconductors, with their ultimate atomic thickness, have shown promise to scale down transistors for modern integrated circuitry. However, the electr…
Exceptionally high, strongly temperature dependent, spin Hall conductivity of SrRuO3
Yongxi Ou, Zhe Wang, Celesta S. Chang +7
Spin-orbit torques (SOT) in thin film heterostructures originate from strong spin-orbit interactions (SOI) that, in the bulk, generate a spin current as the result of extrinsic spi…
A polarization-induced 2D hole gas in undoped gallium nitride quantum wells
Reet Chaudhuri, Samuel James Bader, Zhen Chen +4
The long-missing polarization-induced two-dimensional hole gas is finally observed in undoped gallium nitride quantum wells. Experimental results provide unambiguous proof that a 2…