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

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.
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...
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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,...
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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

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...
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:
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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 in...
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...

You might also read

Related Articles

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

Sort by
Same author

The influence of the Rashba spin-orbit coupling on the two-dimensional magnetoexcitons.

Journal of physics. Condensed matter : an Institute of Physics journal·2011
Same author

A controllable spin prism.

Journal of physics. Condensed matter : an Institute of Physics journal·2011
Same author

Simple test for hidden variables in spin-1 systems.

Physical review letters·2008
Same author

Excitonic condensation under spin-orbit coupling and BEC-BCS crossover.

Physical review letters·2007
Same author

Canonical-covariant Wigner function in polar form.

Journal of the Optical Society of America. A, Optics, image science, and vision·2001

Related Experiment Video

Updated: Jun 19, 2026

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
08:04

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids

Published on: May 27, 2020

Unconventional pairing in excitonic condensates under spin-orbit coupling.

M Ali Can1, T Hakioğlu

  • 1Department of Physics, Bilkent University, 06800 Ankara, Turkey.

Physical Review Letters
|October 2, 2009
PubMed
Summary

Spin-orbit couplings significantly improve excitonic condensate experiments. Low-temperature effects like enhanced photoluminescence and specific heat changes provide clearer insights into this quantum phenomenon.

More Related Videos

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

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Related Experiment Videos

Last Updated: Jun 19, 2026

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
08:04

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids

Published on: May 27, 2020

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

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Area of Science:

  • Condensed matter physics
  • Quantum mechanics
  • Materials science

Background:

  • Excitonic condensates are challenging to study due to their predominantly dark ground state.
  • Understanding the fundamental properties of excitonic condensates requires sensitive experimental probes.
  • Spin-orbit couplings are fundamental interactions influencing electron behavior in materials.

Purpose of the Study:

  • To investigate how Rashba and Dresselhaus spin-orbit couplings enhance experimental observations of excitonic condensates.
  • To identify specific low-temperature effects attributable to spin-orbit couplings that improve experimental conclusiveness.
  • To elucidate the role of spin-orbit interactions in the photoluminescence and thermodynamic properties of excitonic condensates.

Main Methods:

  • Theoretical analysis of spin-orbit couplings (Rashba and Dresselhaus) in the context of excitonic condensates.
  • Examination of photoluminescence measurements, focusing on the enhancement of bright states.
  • Analysis of low-temperature specific heat behavior and critical phenomena.
  • Investigation of static spin susceptibility, particularly nondiagonal elements.

Main Results:

  • Spin-orbit couplings enhance the conclusive power of excitonic condensate experiments.
  • Photoluminescence measurements are facilitated by increased bright state contributions.
  • A low-temperature power law dependence in specific heat and weakened second-order transitions at critical temperatures are observed.
  • Nondiagonal elements appear in the static spin susceptibility.

Conclusions:

  • Rashba and Dresselhaus spin-orbit couplings offer significant advantages for studying excitonic condensates.
  • These couplings provide distinct experimental signatures at low temperatures, aiding in the characterization of excitonic condensates.
  • The findings pave the way for more precise experimental investigations into the nature of excitonic condensates.