Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Beams01:30

Beams

1.9K
Beams are integral components of structural engineering and construction, designed to support loads applied at various points along their length. These long, straight members can be classified based on geometry, cross-section, support type, and equilibrium condition.
Based on geometry, beams can be straight, tapered, or curved. Straight beams are the most common type and have a constant cross-section throughout their length. Tapered beams, on the other hand, have a varying cross-section along...
1.9K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.3K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
3.3K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.5K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.5K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.5K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.5K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.7K
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.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.7K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.5K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
1.5K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Subtherapeutic posaconazole exposure during delayed-release tablet prophylaxis in high-risk patients with haematological malignancies: rationale for routine therapeutic drug monitoring.

The Journal of antimicrobial chemotherapy·2026
Same author

Impact of peri-transplant consolidative radiotherapy in patients with relapsed or refractory classical Hodgkin lymphoma.

Leukemia & lymphoma·2026
Same author

Who will watch the watchmen: unique challenges of T-cell redirecting therapies in T-cell malignancies.

The Lancet. Haematology·2026
Same author

T cell and monocyte activation in concert with hematopoietic stem cell interactions shapes the post-allogeneic transplant immune landscape in poor graft function.

Frontiers in immunology·2026
Same author

European Code Against Cancer 5th edition: 14 ways you can help prevent cancer.

The Lancet regional health. Europe·2026
Same author

A Tribute to Professor Andrew Otis Jackson.

Viruses·2026

Related Experiment Video

Updated: Feb 11, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
10:39

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

Published on: October 11, 2016

10.1K

Coherent Spin Amplification Using a Beam Splitter.

Chengyu Yan1,2, Sanjeev Kumar1,2, Kalarikad Thomas1,2

  • 1London Centre for Nanotechnology, 17-19 Gordon Street, London WC1H 0AH, United Kingdom.

Physical Review Letters
|April 26, 2018
PubMed
Summary

We demonstrate spin amplification in n-type GaAs using a capacitive beam splitter, achieving high spin polarization (~50%) and preserving spin coherence. This method works in materials lacking strong spin-orbit interaction.

More Related Videos

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
15:58

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

6.1K
Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
08:22

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

7.3K

Related Experiment Videos

Last Updated: Feb 11, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
10:39

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

Published on: October 11, 2016

10.1K
Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
15:58

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

6.1K
Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
08:22

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

7.3K

Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Quantum Mechanics

Background:

  • Spin polarization is crucial for spintronic devices.
  • Controlling and amplifying spin polarization is a key challenge.
  • Existing methods often rely on materials with strong spin-orbit interaction.

Purpose of the Study:

  • To investigate spin amplification using a capacitive beam splitter in n-type Gallium Arsenide (GaAs).
  • To demonstrate precise control and amplification of spin-polarized currents.
  • To show that spin coherence is maintained during the amplification process.

Main Methods:

  • Utilizing a capacitive beam splitter in n-type GaAs.
  • Monitoring spin polarization via transverse electron focusing measurements.
  • Observing quantum interference to confirm spin coherence.

Main Results:

  • Achieved precise control over partially spin-polarized current.
  • Demonstrated spin amplification, reaching approximately 50% spin polarization.
  • Confirmed that spin coherence is preserved, evidenced by quantum interference.

Conclusions:

  • Spin polarization amplification is achievable in n-type GaAs using a capacitive beam splitter.
  • This technique allows for significant enhancement of spin polarization without strong spin-orbit interaction.
  • The findings open possibilities for spintronic applications in materials with weak spin-orbit coupling.