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Highlights

Highlights

Freely Jointed Polymers Made of Droplets
Freely Jointed Polymers Made of Droplets
May 20, 2019
New York University

Freely Jointed Polymers Made of Droplets

Angus McMullen, Miranda Holmes-Cerfon, Francesco Sciortino, Alexander Y. Grosberg, and Jasna Brujic, New York University
Here, we control the valence of DNA-functionalized emulsion droplets to make flexible colloidal polymers. We examine their conformational statistics to show that they are freely jointed. We demonstrate that their end-to-end length scales with the number of bonds in agreement with 2D Flory theory, and that their diffusion follows the Zimm model.
A Fully Voltage-Controlled Spin Logic Device
A Fully Voltage-Controlled Spin Logic Device
May 20, 2019
New York University

A Fully Voltage-Controlled Spin Logic Device

Rakheja, Flatté and Kent, New York University
An important goal in electronics is to reduce power use without sacrificing performance. In spintronics this can be accomplished by increasing the rate of charge to spin conversion. We show that one of the most efficient means of converting charge to spin information uses a topological insulator and voltages instead of currents.  
Hierarchical Coherent Phonons
Hierarchical Coherent Phonons
May 20, 2019
Columbia University in the City of New York

Hierarchical Coherent Phonons

Xiaoyang Zhu, Xavier Roy, Colin Nuckolls, Center for Precision Assembly of Superstratic and Superatomic Solids
The coupling of phonons to electrons, excitons and other phonons plays a defining role in material properties, including charge and energy transport, light emission, and superconductivity. In atomic solids such as Si or GaAs, phonons are delocalized over the three-dimensional (3D) lattice and are determined by bonding and crystal symmetry. In molecular materials, by contrast, localized molecular vibrations couple to electrons to produce, for example, high temperature superconductivity, as in A3C60.
2D Superconductivity
2D Superconductivity
May 20, 2019
Columbia University in the City of New York

2D Superconductivity

Cory Dean, Center for Precision Assembly of Superstratic and Superatomic Solids
Two-dimensional materials offer a unique opportunity to explore superconductivity in the two-dimensional (2D) limit with low disorder.  IRG1 creates heterostructures of high-quality monolayers of superconductors encapsulated within insulating boron nitride, which provides protection from external disorder and oxidation.
A base hydrogel, combined with collagen, allows for a mechanical response similar to natural cartilage. A small addition of collagen significantly enhances the mechanical properties.
A base hydrogel, combined with collagen, allows for a mechanical response similar to natural cartilage. A small addition of collagen significantly enhances the mechanical properties.
May 17, 2019
Cornell University

Biomimetic design of 3D-printed cartilege

Cornell researchers employ advanced 3D printing technologies, along with bio-inspired design principles and multiscale predictive modeling to optimize the chemo-mechanical properties of bioprinted artificial cartilage.
The degree of tilt of the RuO6 octahedra in the SrRuO3 film, as determined by ultra-high resolution electron microscopy, determines the magnitude of the spin Hall effect in the material.
The degree of tilt of the RuO6 octahedra in the SrRuO3 film, as determined by ultra-high resolution electron microscopy, determines the magnitude of the spin Hall effect in the material.
May 17, 2019
Cornell University

Maximizing the spin Hall effect by tuning crystal structure

Y. Ou, Z. Wang, C. S. Chang, H. Nair, H. Paik, N. Reynolds, D. C. Ralph, D. A. Muller, D. G. Schlom, and R. A. Buhrman (Cornell University)
Cornell scientists have found that thin films of SrRuO3, when optimally produced, have an exceptionally high spin Hall ratio. This is directly correlated with the degree that octahedral RuO6 subunits in the crystal are tilted away from a flat in-plane orientation.
Graduate students (top) Omar Padilla Velez teaching high school students at Escuela Cedin about batteries with electrochemistry lab and (bottom) Berit Goodge presenting how to build a microscope using pvc pipes and lenses at Sebastian Bilingual High School in Puerto Rico.
Graduate students (top) Omar Padilla Velez teaching high school students at Escuela Cedin about batteries with electrochemistry lab and (bottom) Berit Goodge presenting how to build a microscope using pvc pipes and lenses at Sebastian Bilingual High School in Puerto Rico.
May 17, 2019
Cornell University

Teaching and Inspiring Students in Puerto Rico

Graduate student Omar Padilla Velez, an NSF Graduate Research Fellow, gathered a team of Cornell scientists working in fields from Chemistry to Physics, to bring science to students from middle to undergraduate schools in Puerto Rico.
(a) Schematic of layered structure, where a gate voltage Vg splits water and injects protons (H+) toward the magnetic cobalt (Co) layer. The magnetization (M) switches between in-plane and out-of-plane depending on the presence or absence of protons, as seen in the hysteresis loops of (b). The magnetization orientation can be switched reversibly as the voltage is toggled (c), for thousands of cycles with no device degradation. X-ray absorption spectroscopy was used to verify the presence of hydrogen in a Pd sensing layer (d).
(a) Schematic of layered structure, where a gate voltage Vg splits water and injects protons (H+) toward the magnetic cobalt (Co) layer. The magnetization (M) switches between in-plane and out-of-plane depending on the presence or absence of protons, as seen in the hysteresis loops of (b). The magnetization orientation can be switched reversibly as the voltage is toggled (c), for thousands of cycles with no device degradation. X-ray absorption spectroscopy was used to verify the presence of hydrogen in a Pd sensing layer (d).
May 16, 2019
Massachusetts Institute of Technology

Electrical control of magnetic properties in thin films by hydrogen gating

Geoffrey Beach and Harry Tuller
INTELLECTUAL MERIT  
(a) Schematic of the light-emitting fiber. Wires (orange) are connected to the LEDs (purple). Photograph of light-emitting fibers containing (b) InGaN blue-colour LEDs, (c) InGaN green LEDs, (d) AlGaAsP red LEDs.  (e) Schematic of the photodetecting fiber structure, where an individual photodiode (orange) detects external light (red arrow). (f) Current–voltage curve of photodetecting fiber, showing clear rectifying behaviour. Black curve: in darkness. Red curve: under illumination. (g) Bandwidth of the photodetecting fibre. The 3 dB bandwidth achieved is around 3 MHz. a.u., arbitrary units.
(a) Schematic of the light-emitting fiber. Wires (orange) are connected to the LEDs (purple). Photograph of light-emitting fibers containing (b) InGaN blue-colour LEDs, (c) InGaN green LEDs, (d) AlGaAsP red LEDs.  (e) Schematic of the photodetecting fiber structure, where an individual photodiode (orange) detects external light (red arrow). (f) Current–voltage curve of photodetecting fiber, showing clear rectifying behaviour. Black curve: in darkness. Red curve: under illumination. (g) Bandwidth of the photodetecting fibre. The 3 dB bandwidth achieved is around 3 MHz. a.u., arbitrary units.
May 16, 2019
Massachusetts Institute of Technology

IRG I: Diode Fibers for Fabric-based Optical Communications

Yoel Fink and John D. Joannopoulos
INTELLECTUAL MERIT
Selection of 3D printed artifacts clockwise from top: flasks & pottery; 3D printer lab; ivory plaque; Buddha heads Image source: Justin Jureller, Jeff Gustafson
Selection of 3D printed artifacts clockwise from top: flasks & pottery; 3D printer lab; ivory plaque; Buddha heads Image source: Justin Jureller, Jeff Gustafson
May 10, 2019
University of Chicago

Oriental Institute Mobile Museum Project

At the University of Chicago MRSEC, we pursued new outreach directions with campus museums including the Smart Museum of Art and the Oriental Institute.

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