Spin Hall nano-oscillator based Ising Machines for combinatorial optimization
| Dates: | 30 March 2022 |
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| Times: | 14:00 - 15:00 |
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| What is it: | Seminar |
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| Organiser: | Department of Computer Science |
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| Who is it for: | University staff, Adults, Current University students |
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| Speaker: | Johan Åkerman |
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Join us for the next Computer Science Seminar with speaker Johan Åkerman from
Physics Department, University of Gothenburg, 412 96 Gothenburg, Sweden
In my talk I will first briefly review the fundamentals of Ising Machines and describe different types of quantum and classical implementations. These range from D-waves Quantum Annealer, so-called Coherent Ising Machines based on Degenerate Optical Parametric Oscillators (DOPO), and most recently breadboard and PCB based LCR oscillator networks. I will then describe our recent progress in mutually synchronized nano-constriction based spin Hall nano-oscillator (SHNO) chains 1 and two-dimensional arrays 2 and the possibility of using them for Ising Machines. I will describe how we can generate different types of spin wave modes and control those with voltage cates 4. In our most recent work, we have now added memristive functionality to these SHNOs and demonstrated non-volatile control of mutual synchronization 5 and how this can be used for neuromorphic computing. Using microwave current injection locking and phase-sensitive micro-Brillouin Light Scattering microscopy, such two-dimensional SHNO arrays can be efficiently phase-binarized, which is a prerequisite for oscillator based Ising Machines, and solve MAX-CUT problems 7.
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1 A. A. Awad et al, Nature Physics 13, 292–299 (2017)
2 M. Zahedinejad et al, Nature Nanotechnology 15, 47 (2020)
3 H. Fulara et al, Science Advances 5, eaax8467 (2019)
4 H. Fulara et al, Nature Communication 11, 4006 (2020)
5 M. Zahedinejad et al, Nature Materials 21, 81 (2022)
6 D. I. Albertsson et al, Applied Physics Letters 118, 112404 (2021)
7 A. Houshang et al, Physical Review Applied 17, 014003 (2022)
Speaker
Johan Åkerman
Role: Professor in Experimental Physics
Organisation: Dept of Physics, University of Gothenburg Gothenburg, Sweden
Travel and Contact Information
Find event
TH 1.1 Lecture room
Kilburn
University Of Manchester
Oxford Road
MANCHESTER
