Antiferroelectric Tunnel Junctions as Energy-Efficient Coupled Oscillators: Modeling, Analysis, and Application to Solving Combinatorial Optimization Problems

The majority of the combinatorial optimization problems are solved by searching a solution space that grows as an exponential function of the problem size. Such class of problems scales inefficiently on the Boolean von Neumann architecture. On the other hand, alternative computing techniques like co...

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Bibliographic Details
Published in:IEEE transactions on electron devices 2020-07, Vol.67 (7), p.2974-2980
Main Authors: Andrawis, Robert, Roy, Kaushik
Format: Article
Language:English
Subjects:
Antiferroelectric tunnel junction (AFTJ)
Antiferroelectricity
Boolean algebra
Circuits
Combinatorial analysis
compact model
Computer simulation
Electric potential
Electrostatics
Exponential functions
ferroelectric tunnel junction (FTJ)
Fowler–Nordheim tunneling
Graph coloring
Insulators
Integrated circuit modeling
Junctions
Mathematical programming
Optimization
Oscillators
Solution space
Tunnel junctions
Tunneling
tunneling electroresistance (TER)
Wenzel–Kramer–Brillouin (WKB)
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Summary:The majority of the combinatorial optimization problems are solved by searching a solution space that grows as an exponential function of the problem size. Such class of problems scales inefficiently on the Boolean von Neumann architecture. On the other hand, alternative computing techniques like coupled-oscillator networks are efficient in solving combinatorial optimization problems. In this article, we demonstrate the effectiveness of antiferroelectric tunnel junctions (AFTJs) in coupled-oscillator networks for solving combinatorial optimization problems such as graph coloring. AFTJs are tunnel junctions that show a high ON-/OFF-current ratio. The high ON-/OFF-current ratio of AFTJs allows a higher sense margin at low bias current. Consequently, AFTJ oscillators are more energy-efficient compared to VO 2 -, HfTaOx-, and TaOx-based oscillators. This article explains the origin of the large ON-/OFF-current ratio of AFTJs. A physics-based model is proposed to predict the AFTJ current. The proposed AFTJ model is compared to experimental results to show the ability of the model to predict AFTJ behavior. The proposed AFTJ model is implemented in Verilog-A and used in circuit simulations of the AFTJ-based coupled-oscillator network.
ISSN:0018-9383
1557-9646
DOI:10.1109/TED.2020.2993816