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Subthreshold firing in Mott nanodevices.

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Mott nanodevices exhibit a memory effect after resistive switching. Even after returning to an insulating state, subthreshold voltages can re-trigger the transition, enabling new volatile memory applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Resistive switching modifies device resistance via electric fields, crucial for neuromorphic computing and resistive memories.
  • Threshold firing in Mott insulators enables artificial spiking neurons, characterized by an insulator-to-metal transition above a threshold voltage.

Purpose of the Study:

  • To investigate the memory retention of Mott nanodevices after resistive switching events.
  • To explore the mechanism and duration of the insulator-to-metal transition recovery in Mott systems.

Main Methods:

  • Fabrication and electrical characterization of Mott nanodevices.
  • Application of voltage pulses to induce and study resistive switching dynamics.
  • Analysis of subthreshold voltage effects on insulator-to-metal transitions.

Main Results:

  • Mott nanodevices retain memory of resistive switching events beyond the recovery of insulating resistance.
  • The insulator-to-metal transition can be re-triggered by subthreshold voltages for milliseconds, long after nanosecond-scale recovery.
  • The observed phenomenon is attributed to the intrinsic metastability of first-order phase transitions.

Conclusions:

  • A novel form of volatile memory is demonstrated in Mott-based devices.
  • The findings suggest potential applications in resistive memories, frequency discriminators, and neuromorphic circuits.
  • The memory effect is potentially inherent to all Mott systems exhibiting first-order phase transitions.