Quantum Dot Memristor Capacitive Coupling Hysteresis

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Solution Overview

Problem

Current memristive systems face challenges in harnessing quantum phenomena for functional purposes, particularly at the nanoscale, where classical behaviors are frustrated by stochastic and non-convergent current-voltage characteristics.

Innovation Solution

The development of quantum-mechanical memristive devices utilizing capacitively-coupled double quantum dots, where one dot controls electron transport through quantum tunnelling and the other dot influences the energy level via capacitive coupling, enabling hysteresis and stochastic behavior for memory applications.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If quantum phenomena are harnessed in nanoscale memristive devices, then advanced memory and computing applications are enabled, but stochastic and non-convergent current-voltage characteristics frustrate classical behaviors

Engineering Contradiction:

Improvequantum functionalityVSAvoidcurrent-voltage characteristics

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent converts the harmful stochastic fluctuations and non-convergent behavior into a beneficial quantum hysteresis effect. By operating in the quantum regime and exploiting environmental coupling, the device transforms what was previously considered noise and instability into a reliable memory function with well-defined hysteresis loops, enabling stable quantum memory operation.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent changes the operating parameters from classical to quantum regime by reducing device dimensions to nanoscale and controlling environmental coupling strength. This parameter change transitions the system from exhibiting classical resistance switching to displaying quantum hysteresis with discrete energy levels, thereby enabling reliable quantum memory functionality.

Inventive Principle:

Principle #35Parameter changes

2Length of moving object

If device size is reduced to nanoscale to enable quantum effects, then quantum phenomena emerge, but classical memristive behavior is frustrated

Engineering Contradiction:

Improvedevice sizeVSAvoidmemristive behavior

Core Design Contradiction:

Length of moving objectVSStability of the object's composition

Solution Approach 1:

The patent exploits the phase transition from classical to quantum behavior that occurs at nanoscale dimensions. By carefully controlling the device size and environmental coupling, the system transitions from classical resistance switching to quantum hysteresis with discrete energy levels, maintaining stability through quantum mechanical effects rather than classical mechanisms.

Inventive Principle:

Principle #36Phase transitions

Solution Approach 2:

The patent replaces the classical mechanical resistance switching mechanism with a quantum mechanical hysteresis mechanism. Instead of relying on ionic motion and structural changes typical of classical memristors, the device uses quantum tunneling and environmental coupling to achieve stable memory function at nanoscale dimensions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach allows for the realization of memristive systems with quantum-dot-based devices that exhibit desired hysteresis and stochastic behavior, potentially enabling advanced memory and computing applications by leveraging quantum effects.

Implementation Method 1

a first quantum dot (QD1) which is capacitively coupled to a second quantum dot (QD2), a source electrode, a drain electrode, and a bath electrode, wherein said source electrode and said drain electrode are coupled via quantum tunnelling to QD1

Methodology Applied

Scientific EffectQuantum tunnelling:

Implementation Method 2

a first quantum dot (QD1) which is capacitively coupled to a second quantum dot (QD2)

Methodology Applied

Scientific EffectCapacitive coupling: Capacitance

Implementation Method 3

This time dependent current-voltage characteristic can then be incorporated into a circuit to serve as a memory

Methodology Applied

Scientific EffectHysteresis: Hysteresis

Data Source

PatentEP3446342B1Coupled quantum dot memristor

Publication Date: 2020.03.25 OXFORD UNIVERSITY INNOVATION LTD

Figure 1(a)~1(d)
Figure 2A(a)~2A(b)
Figure 2B(a)~2B(b)

AI summary

The present invention relates to novel memristive devices, uses thereof, and processes for their preparation. In a first aspect the invention provides a quantum memristor, comprising a first quantum dot (QD1 ) which is capacitively coupled to a second quantum dot (QD2), a source electrode, a drain electrode, and a bath electrode, wherein said source electrode and said drain electrode are coupled via quantum tunnelling to QD1 and said bath electrode is coupled via quantum tunnelling to QD2, and wherein QD2 is capacitively coupled to either the source electrode or the drain electrode.