Video Gallery

March Meeting

Virtual Press Room 2015
Image Gallery
Video Gallery

Video Gallery pictures are associated with papers presented at the 2015 March Meeting. Video credit format is on each video information page.

March Meeting Scientific Program
The 2015 March Meeting Bulletin of the American Physical Society, also called the Scientific Program, is a listing of all abstract Meeting presentation.

rGL deformation‬

Weyhaupt 2015 video image

Adam Weyhaupt
Southern Illinois University, Edwardsville

Video showing the deformation of one minimal surface (gyroid) into another (Lidinoid). These surfaces are *triply periodic minimal surfaces* (TPMS). A small piece of a TPMS behaves like a film of soap on a wire frame --- they have the smallest area among surfaces with that wire frame boundary. The special thing about TPMS is that they also have a lot of symmetry, and "fundamental domains" of these surfaces fit together to form larger, coherent structures. Experimentally, these appear in our cells, in polymers, and other neat places.
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Sirius - The new Brazilian synchrotron light source

Rogue 2015 video image

Antonio Jose Roque
Brazilian Synchrotron Light Laboratory (LNLS)

Sirius is the new synchrotron light source that is being constructed by LNLS (Brazilian Synchrotron Light Laboratory). It is planned to be a state of the art fourth generation machine, designed to be one of the most advanced in the world. It will open up new perspectives for research in many fields such as material science, structural biology, nanoscience, physics, earth and environmental science, cultural heritage, among many others.
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Origami "cloak"

Liu 2015 video image

Bin Liu
Cornell University

Origami is becoming a power tool of designing novel mechanical properties. In this design, all the foldable material collapses onto the central cylindrical hole when under compression. This makes the inner region unreachable through any forcing from the outer boundary enabling the origami to serve as a mechanical cloak for this region. In other words, it is impossible to tell the difference from any mechanical measurements if the central hole is replaced by some other materials.
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Systematic Creation of Arbitrary Terrain and Testing of Exploratory Robots (SCATTER)

Qian 2015 video image

Feifei Qian
Georgia Institute of Technology

To discover principles of ambulatory locomotion on heterogeneous granular substrates, we developed a novel experimental system for Systematic Creation of Arbitrary Terrain and Testing of Exploratory Robots (SCATTER), where properties of heterogeneous ground such as sand compaction, boulder shape/size/mobility, substrate orientation, and boulder distribution within the sand, can be precisely controlled and varied to emulate a wide variety of natural complex terrains. This automated system can perform >200 tests/day without human intervention, allowing large amount of data collection and systematic exploration of heterogeneous substrate properties. More details can be found at
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The process of cytokinesis

Turlier 2015 video image

Hervé Turlier
European Molecular Biology Laboratory

Shape dynamics during cell division, as predicted by active gel theory (left) and as observed for a sand-dollar zygote (right). The color code indicates the active stress generated over the thickness of the cell surface cortical layer.
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Simulating Crowd Flow

Karamouzaz 2015 video image

Ioannis Karamouzas
University of Minnesota, Minneapolis

Two simulated groups of pedestrians crossing at right angles. They form narrow, one-way lanes of people moving through the densest region, similar to real crowds.
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The Physics of Origami

Cohen 2015 video image

Itai Cohen
Cornell University

Cornell researchers are uncovering how origami principles could lead to exotic materials, soft robots and even tiny transformers.
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Flux Vortices Entering a Superconductor

Loudon 2015 video image

James Loudon
University of Cambridge

The video shows vortices entering a magnesium diboride superconductor which has very few defects. As the magnetic field is increased, vortices form at the edges and shoot into the centre, faster than the frame rate of the video. The vortices repel one another and as more enter, they jostle to find the optimum position. As the magnetic field is increased, they form different competing arrangements until stabilising at the highest field.
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Serendipity Turkey and the Discovery of Excimer Laser Surgery

Wynne 2015 video image

James Wynne
IBM Research Headquarters

Video excerpt from the 1 hour video program Serendipity, shown on the Discovery Health Channel in June 2002. It presents the story of how my IBM colleagues and I discovered excimer laser surgery in 1981, using Thanksgiving leftovers.
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Silicon Micro-Jungle Gyms for Cells Transforming from 2D to 3D

Rogers 2015 video image

John Rogers
University of Illinois

Video showing overlaid computational and experimental results for the 3D assembly of a silicon microstructure from a planar precursor by processes of compressive buckling.
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Switching Skyrmions

Bergmann 2015 video image

Kirsten von Bergmann
University of Hamburg, Germany

Sequence of images of a thin layer of palladium and iron on top of a iridium crystal (sample area is 50 nm x 38 nm). In this video, single magnetic vortices, or skyrmions, appear and disappear due to the injection of tunneling electrons and show up in the images as black dots. Each skyrmion has a preferred position and individual switching frequency depending on the local environment. Each of the 17 images took about 4 minutes to measure using scanning tunneling spectroscopy. Since the area is scanned line by line from top to bottom, the skyrmions with higher switching frequency may switch not only from image to image but also from line to line, leading to a stripe-like pattern.
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Rotating a Bose-Einstein Condensate

Tsatsos 2015 video image

Storm Weiner
University of California at Berkeley

Marios Tsatsos
University of Sao Paulo

Lorenz S. Cederbaum
Heidelberg University

Axel U. J. Lode
University of Basel

Superfluids are distinguished from ordinary fluids by the quantized manner of their rotations and, subject to rotation, are known to acquire quantized vortices. In this work we study a trapped ultracold Bose gas of 100 atoms in two dimensions under rotation using an exact many-body theory (more details available from the video and abstract links) and find a novel type of quantum vortex: the "phantom vortex". A phantom vortex is hidden, i.e. it cannot be seen in the density of the gas, because the gas splits dynamically into several superfluids, which fill up the quantized vortices of each other. However phantom vortices leave their signature in the collective behaviour of the gas particles which can be quantified by the so-called "correlation function" shown in this video. An appealing 'line structure' forms around the distribution of the elusive phantom vortices.
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Shape-reconfigurable Liquid Metal

Dickey 2015 video image

Michael Dickey
North Carolina State University

It is possible to control the shape of liquid metals composed of gallium using low voltages. The voltage deposits or removes a surface oxide that forms on the metal, which alters the surface tension of the metal.
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Molecular Dynamics Simulation of Na+ Binding to the Transporter Protein, NhaA

Beckstein 2015 video image

Oliver Beckstein
Arizona State University

Molecular dynamics simulation of the membrane protein NhaA, showing how a sodium ion (magenta) binds to the protein. The simulation reveals the residues that are responsible for binding the ion and also unexpectedly showed that ion binding triggers breaking of a salt-bridge.
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Self-assembly of a Shear Jammed State

Behringer 2015 video image

Robert Behringer
Duke University

Bulbul Chakraborty
Sumantra Sarkar

Brandeis University

Dong Wang
Duke University

Jie Ren
Duke University and Merck & Co

(Top) Starting from a force-free state, we shear a system of photoelastic disk-shaped particles, which leads to the spontaneous formation of a shear-jammed state, where the (bright) particles experience large forces. (Bottom) Force-tile representation of the experimental data in the top panel. The force tiles provide insight into key features associated with the transition from an unjammed to a shear-jammed state.
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Worms on a Plane

Selinger 2015 video image

Michael Varga
Mohammad Najafi
Robin Selinger
Kent State University

When worm-shaped bacteria crawl together on a surface, they swirl and clump to form sinuous traveling swarms that continuously collide, break apart, and reassemble. Using computer simulations of crawling "worms on a plane," we explore how bacteria shape, flexibility, and behavior affect the patterns they form.
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Synthetic Aqueous SpiderSilk Fibers & Gels: NanoStructure Study using Synchrotron X-rays

Sampath 2015 video image

Sujatha Sampath
University of Utah

Justin Jones
Thomas Harris
Randolph Lewis

Utah State University

Spider silks are extraordinary biopolymers having a combination of high strength and elasticity. Their amazing mechanical properties are largely due to their protein composition and their nanoscale structure. Synthesis of aqueous gels and fibers from recombinant spider silk dopes have been achieved with potential applications in tissue engineering and targeted drug delivery vehicles in nanomedicine. Understanding the nanoscale structure is crucial to design and improve on the material properties. Synchrotron X-ray diffraction experiments are used to probe the nanoscale structure of the fibers and gels.
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The Science of Kirigami

Castle 2015 video image

Toen Castle
University of Pennsylvania

Randall Kamien of the University of Pennsylvania explains how to create complex three-dimensional structures using the ancient Japanese art form of kirigami.
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Experimental Detection of Superfluidity and Calculation of the Superfluid Density

Rousseau 2015 video image

Valéry Rousseau

This video illustrates how superfluidity can be detected experimentally. Performing a “thought experiment" that idealizes the real experiment, the superfluid density can be defined and calculated by the Correspondence Principle, which relates quantum behaviors with classical behaviors for large energies.
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Forming a Photonic Hyper-Crystal

Smolyaninova 2015 video image

Vera Smolyaninova
Bradley Yost
David Lahneman

Towson University

Igor Smolyaninov
University of Maryland

A photonic hyper-crystal is forming in cobalt-based ferrofluid under a magnetic field. A photonic hyper-crystal has two scales of periodicity. Larger micron-scale features appearing in the video are responsible for the photonic crystal behavior. Smaller scale nano-columns (not resolvable optically) are responsible for hyperbolic metamaterial behavior.
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