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Related Concept Videos

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Related Experiment Video

Updated: Jun 3, 2026

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

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Published on: June 3, 2015

Pumped charge and spin current in a quantum dot molecule.

Hui Pan1, Shengyuan A Yang, Qian Niu

  • 1Department of Physics, The University of Texas at Austin, Austin, TX 78712, USA.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 15, 2011
PubMed
Summary

This study explores how AC electric fields influence quantum transport in double quantum dots. Researchers found that AC fields can drive a DC charge current via photon-assisted tunneling, controllable with various parameters.

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Last Updated: Jun 3, 2026

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
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12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Nanotechnology

Background:

  • Quantum dots are nanoscale semiconductor crystals exhibiting quantum mechanical properties.
  • Understanding quantum transport is crucial for developing quantum computing and spintronic devices.
  • Parallel-coupled double quantum dot systems offer a platform for studying electron interactions and transport phenomena.

Purpose of the Study:

  • To investigate the theoretical effects of AC electric fields on quantum transport in parallel-coupled double quantum dots.
  • To explore the mechanism of DC charge current pumping at zero bias.
  • To examine the controllability of pumped current characteristics and the potential for pure spin current generation.

Main Methods:

  • Theoretical investigation using quantum transport models.
  • Analysis of photon-assisted tunneling effects under AC electric field stimulation.
  • Simulation of electron transport considering gate voltage, AC field amplitude, and frequency variations.
  • Inclusion of spin-orbit interaction to study spin current generation.

Main Results:

  • A DC charge current can be pumped at zero bias, driven by photon-assisted tunneling.
  • The pumped current's sign, magnitude, and peak positions are controllable by adjusting gate voltage and AC field parameters (amplitude, frequency).
  • The study discusses the feasibility of electrically pumping a pure spin current when spin-orbit interaction is present.

Conclusions:

  • AC electric fields provide an effective method for controlling quantum transport in double quantum dot systems.
  • Photon-assisted tunneling is a key mechanism for generating controllable DC currents.
  • The findings suggest potential applications in tunable quantum devices and spintronics.