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

¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

1.2K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
1.2K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

863
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...
863
¹H NMR Signal Multiplicity: Splitting Patterns01:13

¹H NMR Signal Multiplicity: Splitting Patterns

4.9K
When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
4.9K
Resonance02:52

Resonance

53.1K
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds. 
53.1K
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

1.1K
In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
1.1K
VSEPR Theory and the Effect of Lone Pairs04:01

VSEPR Theory and the Effect of Lone Pairs

41.7K
Effect of Lone Pairs of Electrons on Molecule Geometry
41.7K

You might also read

Related Articles

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

Sort by
Same author

Imaging the flat bands of magic-angle graphene reshaped by interactions.

Nature·2026
Same author

Spin Injection and Emission Helicity Switching in a 2D Perovskite/WSe<sub>2</sub> Heterostructure.

Nano letters·2026
Same author

Revealing Electron-Electron Interactions in Graphene at Room Temperature with a Quantum Twisting Microscope.

Nano letters·2026
Same author

Optical control over topological Chern number in moiré materials.

Nature·2026
Same author

Observation of a superfluid-to-insulator transition of bilayer excitons.

Nature·2026
Same author

Radio-Frequency Charge Detection on Graphene Electron-Hole Double Quantum Dots.

Nano letters·2025

Related Experiment Video

Updated: May 29, 2025

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

8.3K

Quadrupolar excitons in MoSe2 bilayers.

Jakub Jasiński1,2, Joakim Hagel3, Samuel Brem4

  • 1Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, Wroclaw, Poland.

Nature Communications
|February 5, 2025
PubMed
Summary
This summary is machine-generated.

Researchers discovered quadrupolar excitons in molybdenum diselenide (MoSe2) homobilayers. These exotic states, useful for quantum simulations, show unique energy shifts in electric fields, offering new possibilities for light-matter interactions.

More Related Videos

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

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

Published on: October 13, 2017

9.1K
High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
10:40

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

7.4K

Related Experiment Videos

Last Updated: May 29, 2025

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

8.3K
Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

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

Published on: October 13, 2017

9.1K
High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
10:40

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

7.4K

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Optics

Background:

  • Transition metal dichalcogenide (TMD) heterostructures are crucial for generating exotic excitonic states.
  • Quadrupolar excitons, a superposition of two dipolar excitons, are key for quantum simulations and many-body physics.

Purpose of the Study:

  • To demonstrate the emergence of quadrupolar excitons in natural molybdenum diselenide (MoSe2) homobilayers.
  • To investigate the electric field response of these quadrupolar excitons.
  • To explore the advantages of MoSe2 homobilayers over trilayer systems for exciton coupling.

Main Methods:

  • Experimental observation of quadrupolar excitons in MoSe2 homobilayers.
  • Application of electric fields to study energy shifts.
  • Many-particle theory calculations for microscopic insights.

Main Results:

  • Unambiguous demonstration of quadrupolar excitons in MoSe2 homobilayers.
  • Observation of a quadratic energy shift in response to an electric field.
  • Identification of enhanced coupling between dipolar excitons in homobilayers compared to trilayers.

Conclusions:

  • MoSe2 homobilayers provide an ideal platform for engineering excitonic states and their light interactions.
  • These systems are promising candidates for on-chip quantum simulations.
  • The study offers microscopic understanding of quadrupolar exciton formation.