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Updated: Sep 11, 2025

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Second-Order Synaptic Memory using Inherent Plasticity of Moiré Superlattices.

Tanweer Ahmed1, Kenji Watanabe2, Takashi Taniguchi3

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Advanced Materials (Deerfield Beach, Fla.)
|August 16, 2025
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Summary
This summary is machine-generated.

Researchers developed a novel synaptic memory device using twisted double bilayer graphene (tDBLG) moiré superlattices. This carbon-based material exhibits electronic plasticity and tunable nonlinearity, paving the way for energy-efficient neuromorphic computing.

Keywords:
Twisted double bilayer grapheneextrinsic mechanismsmoiré superlatticessecond‐order nonlinear electrical responsesynaptic memory

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Computing

Background:

  • Achieving electronic synaptic functionality in single-element quantum materials is challenging.
  • Conventional methods often require extrinsic charge-traps or polar components.

Purpose of the Study:

  • To demonstrate electronic hysteresis and plasticity in twisted double bilayer graphene (tDBLG) moiré superlattices.
  • To harness these properties for a second-order synaptic memory device.

Main Methods:

  • Fabrication of tDBLG moiré superlattices with twist-angle disorder.
  • Characterization of electronic hysteresis, plasticity, and second-order nonlinear electrical response.
  • Tuning of nonlinearity via carrier concentration and vertical displacement fields.

Main Results:

  • tDBLG moiré superlattices exhibit electronic hysteresis and plasticity.
  • Inversion symmetry breaking leads to tunable second-order nonlinear electrical response.
  • A second-order synaptic memory device was successfully realized.

Conclusions:

  • Strained moiré carbon systems offer a new platform for energy-efficient neuromorphic computing.
  • Complex electronic functionality can emerge from symmetry-breaking physics in single-element materials.