Northwestern Events Calendar

Nov
18
2021

CMP Seminar: Andreas Glatz: Towards Critical Current by Design

When: Thursday, November 18, 2021
4:00 PM - 6:00 PM Central

Where: Technological Institute, F160, 2145 Sheridan Road, Evanston, IL 60208 map it

Audience: Faculty/Staff - Student - Post Docs/Docs - Graduate Students

Contact: Samantha Westlake  

Group: Physics and Astronomy Condensed Matter Physics Seminars

Category: Academic

Description:

Abstract: Understanding the dynamic behavior of vortex matter in complicated pinning landscapes is a major challenge for both fundamental science and energy applications. In particular, the type, size, and density of pinning centers define the critical current, the largest current a superconductor can carry without losses. The prediction of optimal defect topologies for a given application is a highly non-trivial task. In this talk, I will present our work to address this challenge based on understanding the underlying complex vortex dynamics and calculation of critical currents in arbitrary pinning landscapes by large-scale time-dependent Ginzburg-Landau (TDGL) simulations [1, 2].

I will show validation studies using STEM tomography data for direct simulation of a real sample [3], introduce the Critical-Current-by-Design approach [4] and optimization strategies [5] by some examples.

Finally, I will present our most recent work on utilizing advanced geneticalgorithms running on leadership-class supercomputers to find and optimize arbitrary pinning landscapes, where we borrow concepts from biological evolution and replace natural selection by targeted selection to successively improve the fitness of the system, here the critical current [6].

This Critical-Current-by-Design approach allows for the design of completely new defect configurations or improve existing commercialstructures by post-processing.

References:
[1.] I. A. Sadovskyy, A. E. Koshelev, C. L. Phillips, D. A. Karpeev, A. Glatz, J. of Comp. Phys. 294, 639 (2015).
[2.] http://oscon-scidac.org/
[3.] I. A. Sadovskyy, A. E. Koshelev, A. Glatz, V. Ortalan, M. W. Rupich, M. Leroux, Phys. Rev. Applied 5, 014011 (2016).
[4.] Ivan A. Sadovskyy, Ying Jia, Maxime Leroux, Jihwan Kwon, Hefei Hu, Lei Fang, Carlos Chaparro, Shaofei Zhu, Ulrich Welp, Jianmin Zuo, Venkat Selvamanickam, George W. Crabtree, Alexei E. Koshelev, Andreas Glatz, and Wai-Kwong Kwok, Adv. Mat. 28, 4593 (2016).
[5.] Gregory Kimmel, Ivan A. Sadovskyy, Andreas Glatz, Phys. Rev. E 96, 013318 (2017).
[6.] Ivan A. Sadovskyy, Alexei E. Koshelev, Wai-Kwong Kwok, Ulrich Welp, and Andreas Glatz, PNAS 116 (21), 10291 (2019).

Speaker: Professor Andreas Glatz, NIU

Host: Professor John Ketterson

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