関連する実験動画

Updated: Jun 5, 2025

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx

Published on: May 13, 2020

ε-Cu_0.9V₂O₅ニューロモルフシングル・クリスタル・オシレータにおける伝導性のシューティング

John Ponis¹, Nicholas Jerla², George Agbeworvi¹

¹Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States.

Journal of the American Chemical Society

|December 4, 2024

まとめ

研究者らは, ε-Cu_0.9V₂O₅の原子再配置が,ニューロモルフィックコンピューティングのための金属分離器の移行をどのように誘導するかを明らかにした. イオン運動を理解することで,人工ニューロンとシナプスの原子設計が可能になります.

科学分野:

材料科学
凝縮物質物理学
ニューロモルフィック・エンジニアリング

背景:

脳にインスパイアされたコンピューティングにはエネルギー効率の良い人工ニューロンとシナプスが必要です
線形でない伝導性を有する固体化合物はメタル・インソレーター・トランジションのように生物学的ニューロンの振る舞いを真似するのに不可欠です
これらの材料の電子構造に影響を与える原子の再編成は完全に理解されていません.

研究の目的:

ε-Cu_0.9V₂O₅における不連続伝導性のスイッチングの背後にある原子機構を調査する.
ニューロモルフィックアプリケーションの電子特性の変化と構造変換を相関させる.
人工ニューロンの原子設計の洞察を提供するためです

主な方法:

非線形動的振動器をミリメートルサイズの ε-Cu_0.9V₂O₅結晶から製造する.
単一結晶のX線微分法で構造変化を原子スケールでマップする
電子状態を分析するために,電子構造の計算と解離されたサンプルと共に,X線吸収と放射スペクトロスコピーを用いる.

主要な成果:

反鉄磁気断熱器からパラ磁気金属への断続的伝導性の切り替えが観察された.
Cuイオンの超格子順序と[V₄O₁₀]層間の移動を特定し,電荷とスピンの順序につながった.
フェルミレベルに近いCu 3dとV 3d軌道が重なり,V 3d状態の調節が導電性のスイッチングを媒介する.

結論:

Cuイオン再配置は,電子構造と ε-Cu_0.9V₂O₅における伝導性のスイッチングを直接制御する.
この研究は,ニューロモルフィックデバイスの設計に不可欠な非線形伝導性を支配する原子学的経路を明らかにしています.
この理解は,材料の修正を通じて人工ニューロンとシナプスの合理的な設計を容易にする.

さらに関連する動画

Writing and Low-Temperature Characterization of Oxide Nanostructures

Writing and Low-Temperature Characterization of Oxide Nanostructures

Published on: July 18, 2014

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating

Published on: April 12, 2018

関連する概念動画

Non-ohmic Devices

Non-ohmic Devices

In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...

Oscillations In An LC Circuit

Oscillations In An LC Circuit

An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by

MOS Capacitor

MOS Capacitor

A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...

Biasing of Metal-Semiconductor Junctions

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...

MOSFET: Enhancement Mode

MOSFET: Enhancement Mode

Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...

Biasing of FET

Biasing of FET

Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...