Computations in Science Seminars
Oct 2018
24
Wed 12:15
Pedro Saenz, MIT
e-mail:
Host: William Irvine ()
Organizer: Peter Chung ()
Spin lattices of walking droplets

Understanding the self-organization principles and collective dynamics of non-equilibrium matter remains a major challenge despite considerable progress over the last decade. In this talk, I will introduce a hydrodynamic analog system that allows us to investigate simultaneously the wave-mediated self-propulsion and interactions of effective spin degrees of freedom. Millimetric liquid droplets can walk across the surface of a vibrating fluid bath, self-propelled through a resonant interaction with their own guiding wave fields. A walking droplet, or ‘walker', may be trapped by a submerged circular well at the bottom of the fluid bath, leading to a clockwise or counter-clockwise angular motion centered at the well. When a collection of such wells is arranged in a 1D or 2D lattice geometry, a thin fluid layer between wells enables wave-mediated interactions between neighboring walkers. Through experiments and mathematical modeling, we demonstrate the spontaneous emergence of coherent droplet rotation dynamics for different types of lattices. For sufficiently strong pair-coupling, wave interactions between neighboring droplets may induce local spin flips leading to ferromagnetic or antiferromagnetic order. Transitions between these two forms of order can be controlled by tuning the lattice parameters. More generally, our results reveal a number of surprising parallels between the collective spin dynamics of wave-driven droplets and known phases of classical condensed matter systems. This suggests that our hydrodynamic analog system can be used to explore universal aspects of active matter and wave-mediated particle interactions, including spin-wave propagation and topologically protected dynamics far from equilibrium.

Oct 2018
31
Wed 12:15
Timothy C. Berkelbach, University of Chicago
e-mail:
Host: Arvind Murugan ()
Organizer: Grayson Jackson ()
Nov 2018
7
Wed 12:15
Brad Marston, Brown University
e-mail:
Host: William Irvine ()
Organizer: Steven Strong ()
Nov 2018
14
Wed 12:15
Oni Basu, University of Chicago
e-mail:
Host: Arvind Murugan ()
Nov 2018
28
Wed 12:15
Felice Frankel, MIT
e-mail:
Host: Sid Nagel ()
More Than Pretty Pictures

Graphics, images and figures — visual representations of scientific data and concepts — are critical components of science and engineering research. They communicate in ways that words cannot. They can clarify or strengthen an argument and spur interest into the research process.

But it is important to remember that a visual representation of a scientific concept or data is a re-presentation and not the thing itself –– some interpretation or translation is always involved. Just as writing a journal article, one must carefully plan what to “say,” and in what order to “say it.” The process of making a visual representation requires you to clarify your thinking and improve your ability to communicate with others.

In this talk, I will show my own approach to creating depictions in science and engineering—the successes and failures. Included will be a discussion about how far can we go when “enhancing” science images.

Dec 2018
5
Wed 12:15
David Lubensky, University of Michigan
e-mail:
Host: Arvind Murugan ()
Dec 2018
12
Wed 12:15
Chiara Daraio, Caltech
e-mail:
Host: William Irvine ()
Jan 2019
9
Wed 12:15
OPEN
Jan 2019
16
Wed 12:15
Margaret Gardel, University of Chicago
e-mail:
Host: Arvind Murugan ()
Jan 2019
23
Wed 12:15
OPEN
Jan 2019
30
Wed 12:15
OPEN
Feb 2019
6
Wed 12:15
OPEN
Feb 2019
13
Wed 12:15
Jörn Dunkel, MIT
e-mail:
Host: William Irvine ()
Feb 2019
20
Wed 12:15
Greg Voth, Wesleyan University
e-mail:
Host: William Irvine ()
Feb 2019
27
Wed 12:15
OPEN
Mar 2019
13
Wed 12:15
OPEN
Mar 2019
20
Wed 12:15
Hana El-Samad, University of California, San Francisco
e-mail:
Host: Arvind Murugan ()
Mar 2019
27
Wed 12:15
OPEN
Apr 2019
3
Wed 12:15
Greg Bewley, Cornell University
e-mail:
Host: William Irvine ()
Apr 2019
10
Wed 12:15
Oskar Hallatschek, UC Berkeley
e-mail:
Host: Arvind Murugan ()
Apr 2019
17
Wed 12:15
Nikta Fakhri, MIT
e-mail:
Apr 2019
24
Wed 12:15
Detlef Lohse, University of Twente
e-mail:
Host: William Irvine ()
May 2019
1
Wed 12:15
Pankaj Mehta, Boston University
e-mail:
Host: Stefano Allesina
May 2019
8
Wed 12:15
Thierry Emonet, Yale University
e-mail:
Host: Arvind Murugan ()
May 2019
15
Wed 12:15
David Lentik, Stanford
e-mail:
Host: William Irvine ()
May 2019
22
Wed 12:15
Joshua Shaevitz, Princeton University
e-mail:
Host: Arvind Murugan ()
May 2019
29
Wed 12:15
Xiaoming Mao, University of Michigan
e-mail: