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  • I. García-Aguilar/Leiden Univ.; E. Sloutskin/Bar-Ilan Univ.

    Faceting and Flattening of Emulsion Droplets PRL Editors' Suggestion

    Prof. Eli Sloutskin

    Faceting and Flattening of Emulsion Droplets: A Mechanical Model (PRL Editors' Suggestion)

    Ireth García-Aguilar, Piermarco Fonda, Eli Sloutskin, and Luca Giomi Phys. Rev. Lett. 126, 038001 – Published 21 January 2021

    ABSTRACT

    When cooled down, emulsion droplets stabilized by a frozen interface of alkane molecules and surfactants have been observed to undergo a spectacular sequence of morphological transformations: from spheres to faceted liquid icosahedra, down to flattened liquid platelets. While generally ascribed to the interplay between the elasticity of the frozen interface and surface tension, the physical mechanisms underpinning these transitions have remained elusive, despite different theoretical pictures having been proposed in recent years. In this Letter, we introduce a comprehensive mechanical model of morphing emulsion droplets, which quantitatively accounts for various experimental observations, including the size scaling behavior of the faceting transition. Our analysis highlights the role of gravity and the spontaneous curvature of the frozen interface in determining the specific transition pathway.

    An article was written about this article in Physics Magazine

  • PHYSICAL REVIEW LETTERS

    Fractional Advection-Diffusion-Asymmetry Equation

    Wanli Wang and Prof. Eli Barkai

    Fractional Advection-Diffusion-Asymmetry Equation

    Wanli Wang and Eli Barkai

    PHYSICAL REVIEW LETTERS

    Abstract

    Fractional kinetic equations employ noninteger calculus to model anomalous relaxation and diffusion in many systems. While this approach is well explored, it so far failed to describe an important class of transport in disordered systems. Motivated by work on contaminant spreading in geological formations, we propose and investigate a fractional advection-diffusion equation describing the biased spreading packet. While usual transport is described by diffusion and drift, we find a third term describing symmetry breaking which is omnipresent for transport in disordered systems. Our work is based on continuous time random walks with a finite mean waiting time and a diverging variance, a case that on the one hand is very common and on the other was missing in the kaleidoscope literature of fractional equations. The fractional space derivatives stem from long trapping times, while previously they were interpreted as a consequence of spatial L ́evy flights.

     

  • DNA origami octahedral frames

    DNA-assembled superconducting 3D nanoscale architectures

    Prof. Yosef Yeshurun & Lior Shani

    Abstract

    Studies of nanoscale superconducting structures have revealed various physical phenomena and led to the development of a wide range of applications. Most of these studies concentrated on one- and two-dimensional structures due to the lack of approaches for creation of fully engineered three-dimensional (3D) nanostructures. Here, we present a ‘bottom-up’ method to create 3D superconducting nanostructures with prescribed multiscale organization using DNA-based self-assembly methods. We assemble 3D DNA superlattices from octahedral DNA frames with incorporated nanoparticles, through connecting frames at their vertices, which result in cubic superlattices with a 48 nm unit cell. The superconductive superlattice is formed by converting a DNA superlattice first into highly-structured 3D silica scaffold, to turn it from a soft and liquid-environment dependent macromolecular construction into a solid structure, following by its coating with superconducting niobium (Nb). Through low-temperature electrical characterization we demonstrate that this process creates 3D arrays of Josephson junctions. This approach may be utilized in development of a variety of applications such as 3D Superconducting Quantum interference Devices (SQUIDs) for measurement of the magnetic field vector, highly sensitive Superconducting Quantum Interference Filters (SQIFs), and parametric amplifiers for quantum information systems.

    Full Article

  • WIRED MAGAZINE
  • Low energy band structure
  • Two dimensional maps of the elastic response
  • Illustration of the system
  • Robustness of interdependent networks based on bond percolation
  • schematic diagram of the proposed experimental system
  • particle distance from its central coordinate