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Semiconductors01:22

Semiconductors

There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Biasing of Metal-Semiconductor Junctions01:27

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...
Neuromuscular Junction And Blockade01:29

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The site of chemical communication between a motor neuron and a muscle fiber is called the neuromuscular junction (NMJ). The end of the motor neuron at the NMJ divides into a cluster of synaptic end bulbs. The cytoplasm of these bulbs consists of synaptic vesicles enclosing acetylcholine molecules, the principal neurotransmitter released at the NMJ. The region opposite the synaptic bulb that ends in the muscle fiber is called the motor end plate, which has acetylcholine receptors. Within the...
MOSFET: Enhancement Mode01:22

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 current...

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Related Experiment Video

Updated: May 24, 2026

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
14:58

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Published on: June 3, 2015

Valley blockade quantum switching in Silicon nanostructures.

Enrico Prati1

  • 1Laboratorio Materiali e Dispositivi per la Microelettronica, Consiglio Nazionale delle Ricerche--IMM, Via Olivetti 2, 1-20041 Agrate Brianza, Italy.

Journal of Nanoscience and Nanotechnology
|March 10, 2012
PubMed
Summary

Researchers explored valley blockade in silicon nanostructures, analogous to Coulomb and Pauli spin blockade. A novel silicon quantum switch separates electrons by valley parity, enabling hybrid quantum-classical logic.

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Published on: November 1, 2013

Area of Science:

  • Solid-state physics
  • Quantum computing
  • Nanotechnology

Background:

  • Coulomb blockade and Pauli spin blockade are established phenomena in quantum transport.
  • Silicon nanostructures offer a promising platform for quantum devices due to their compatibility with existing semiconductor technology.
  • Understanding and controlling electron valley properties is crucial for advanced quantum applications.

Purpose of the Study:

  • To explore the concept of valley blockade in silicon nanostructures.
  • To define a valley parity operator for characterizing valley blockade.
  • To propose a novel silicon quantum changeover switch based on valley blockade principles.

Main Methods:

  • Theoretical exploration of valley blockade, drawing analogies to Coulomb and Pauli spin blockade.
  • Definition and application of a valley parity operator in quantum transport.
  • Proposal of a device architecture utilizing a triple of donor quantum dots.

Main Results:

  • Valley blockade is determined by the parity conservation of valley composition eigenvectors during quantum transport.
  • A functional silicon quantum changeover switch is proposed, capable of separating electrons based on opposite valley parity.
  • The proposed switch leverages valley parity conservation for its operation.

Conclusions:

  • Valley blockade is a viable quantum transport phenomenon in silicon nanostructures.
  • The proposed silicon quantum changeover switch demonstrates a novel approach to hybrid quantum-classical logic.
  • This work opens new avenues for developing advanced classical logic devices based on quantum principles.