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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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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis. This...
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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
14:58

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Published on: June 3, 2015

Nonadiabatic two-parameter charge and spin pumping in a quantum dot.

Matthias Braun1, Guido Burkard

  • 1Institute of Theoretical Physics C, RWTH Aachen University, D-52056 Aachen, Germany.

Physical Review Letters
|September 4, 2008
PubMed
Summary
This summary is machine-generated.

We explore charge and spin transport in quantum dots using oscillating parameters. Interference between voltage and coupling oscillations explains recent findings and suggests possibilities for spin current generation.

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Area of Science:

  • Condensed matter physics
  • Quantum computing
  • Mesoscopic physics

Background:

  • Quantum dots are crucial for quantum information processing.
  • Understanding charge and spin transport is key to developing quantum devices.
  • Previous models, like Tien and Gordon's, focused on simpler parameter changes.

Purpose of the Study:

  • To investigate DC charge and spin transport in quantum dots under non-adiabatic periodic parameter changes.
  • To generalize existing models for simultaneous oscillations of voltage and tunnel couplings.
  • To explain recent experimental observations in metallic islands and explore spin current pumping.

Main Methods:

  • Generalizing the Tien and Gordon model to include simultaneous oscillations.
  • Analyzing two-parameter charge pumping in quantum dots.
  • Investigating the role of interference effects between oscillating parameters.
  • Considering the influence of a static magnetic field on spin transport.

Main Results:

  • Discovered interference effects between oscillating voltage and tunnel couplings in quantum dots.
  • Demonstrated that these interference effects can explain recent experimental measurements.
  • Showed the potential for electrically pumping a spin current using a static magnetic field.

Conclusions:

  • The generalized model provides a framework for understanding complex transport phenomena in quantum dots.
  • Interference effects are critical for accurate modeling of charge pumping.
  • Electrical spin current generation is a feasible prospect in quantum dot systems.