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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...
Valence Bond Theory02:42

Valence Bond Theory

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...
The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.

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Related Experiment Video

Updated: May 18, 2026

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
09:00

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Published on: June 28, 2018

Spin-orbit induced electronic spin separation in semiconductor nanostructures.

Makoto Kohda1, Shuji Nakamura, Yoshitaka Nishihara

  • 1Department of Materials Science, Tohoku University, 6-6-02 Aramaki-Aza Aoba, Aoba-ku, Sendai 980-8579, Japan. makoto@material.tohoku.ac.jp

Nature Communications
|September 27, 2012
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate electronic spin separation in semiconductor nanostructures, overcoming Lorentz force limitations. This advancement paves the way for novel spintronic technologies using effective magnetic fields.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Materials science

Background:

  • The Stern-Gerlach experiment demonstrated quantized spin splitting, crucial for spintronics.
  • Electrical spin separation in spintronics faces challenges from Lorentz force and field gradient control.

Purpose of the Study:

  • To demonstrate electronic spin separation in a semiconductor nanostructure.
  • To overcome limitations of traditional spin separation methods in spintronics.

Main Methods:

  • Utilized the effective non-uniform magnetic field from Rashba spin-orbit interaction in an InGaAs heterostructure.
  • Employed a Stern-Gerlach-inspired mechanism combined with a quantum point contact.

Main Results:

  • Achieved effective field gradients of 10^8 T m^-1.
  • Successfully demonstrated electronic spin separation, generating a highly polarized spin current.

Conclusions:

  • This work enables efficient electrical spin separation in semiconductor nanostructures.
  • The method avoids Lorentz force issues, advancing spintronic device development.