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Area of Science:

  • Materials Science
  • Nanotechnology
  • Neuroscience

Background:

  • Artificial synapses are crucial for developing neuromorphic computing systems.
  • Quantum dots (QDs) and graphene offer promising properties for synaptic devices.
  • Controlling synaptic plasticity (weight changes) with external stimuli is a key challenge.

Purpose of the Study:

  • To demonstrate excitatory and inhibitory properties in a single heterostructure synaptic device.
  • To utilize linearly polarized light as a stimulus to control synaptic functions.
  • To investigate polarization-dependent photocurrent and its effect on synaptic weight.

Main Methods:

  • Fabrication of a heterostructure with two quantum dot/graphene synaptic elements.
  • Integration of perovskite quantum dots (PQDs) for excitatory response and PbS quantum dots (PbQDs) for inhibitory response.
  • Use of a polarizer to control the polarization of incident monochromatic light.

Main Results:

  • Achieved polarization-dependent photocurrent, enabling control over synaptic weight.
  • Demonstrated potentiation (increase) and habituation (decrease) of photocurrent weights using polarized light.
  • Showcased sequential potentiation and habituation using orthogonal light polarizations.

Conclusions:

  • A single heterostructure device exhibits tunable excitatory and inhibitory synaptic behavior.
  • Linearly polarized light effectively controls synaptic plasticity in quantum dot/graphene systems.
  • This work provides a pathway for developing advanced, light-controlled artificial synaptic devices.