Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Band Theory

Band Theory

When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...

Energy Bands in Solids

Energy Bands in Solids

Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states...

Valence Bond Theory

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...

Semiconductors

Semiconductors

There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...

Debye–Huckel–Onsager Conductance Equation

Debye–Huckel–Onsager Conductance Equation

The Debye-Hückel-Onsager equation is a cornerstone of physical chemistry, providing a method to determine the molar conductance (Λm) and molar conductance at infinite dilution (Λ°m) for uni-univalent electrolytes.Uni-univalent electrolytes are electrolytes that dissociate in solution to produce one cation with a +1 charge and one anion with a –1 charge per formula unit.This equation addresses two crucial phenomena: the asymmetry effect and the electrophoretic effect.

Fermi Level

Fermi Level

The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...

You might also read

Related Articles

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

Sort by

Same author

Phase engineering of atomically thin magnetic chromium tellurides via molecular beam epitaxy.

Nature communications·2026

Same author

Free-Anionic Duality of Interstitial Electrons Drives Superconductivity in Electride La<sub>3</sub>In.

Journal of the American Chemical Society·2026

Same author

Designing Quantum Matter in Pyrochlore Iridates: A Perspective on Recent Thin-Film Advances.

Journal of physics. Condensed matter : an Institute of Physics journal·2026

Same author

Biomechanical Differences During Overground Walking in Virtual Reality: A Comparative Study With a Real Environment.

Journal of applied biomechanics·2026

Same author

Supercurrent effect in a charge density wave intertwined superconductor.

Nature communications·2026

Same author

Direct Thermal Resistance Measurement of a Single Defect in Graphite.

ACS nano·2026

Search research articles

Related Experiment Video

Updated: Mar 29, 2026

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

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

Published on: December 3, 2013

Dimensionality-Dependent Exciton Dispersion in a Single-Band Mott Insulator.

Zhibin Su^1,2, Junjian Mi^3,4, Shaohua Yan^5,6

¹Chinese Academy of Sciences, Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Beijing 100190, China.

Physical Review Letters

|March 27, 2026

Summary

Exciton dispersion in Nb3Cl8 changes dramatically with temperature, shifting from 2D linear to 3D parabolic behavior due to interlayer coupling. This reveals how dimensionality impacts exciton dynamics.

More Related Videos

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

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

Published on: May 27, 2020

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

Related Experiment Videos

Last Updated: Mar 29, 2026

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

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

Published on: December 3, 2013

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

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

Published on: May 27, 2020

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

Area of Science:

Condensed matter physics
Materials science
Quantum mechanics

Background:

Exciton dynamics are crucial for understanding electronic properties.
Quantum exchange scattering significantly influences exciton dispersion.
Dimensionality plays a key role in modulating material behavior.

Purpose of the Study:

To directly observe dimensionality-dependent exciton dispersion.
To investigate the impact of phase transitions on exciton behavior.
To study exciton dynamics in the single-band Mott insulator Nb3Cl8.

Main Methods:

High-resolution electron energy loss spectroscopy (HREELS).
Analysis of exciton dispersion in different temperature phases.
Investigating interlayer coupling effects.

Main Results:

Observed quasi-two-dimensional massless linear exciton dispersion in the high-temperature phase.
Observed two distinct bands with three-dimensional parabolic exciton dispersion in the low-temperature phase.
Demonstrated a significant enhancement of interlayer coupling across the phase transition.

Conclusions:

Exciton dispersion is strongly dependent on dimensionality and interlayer coupling.
Phase transitions can induce dimensional mutations affecting exciton behavior.
Nb3Cl8 serves as a model system for studying dimensionality-driven exciton evolution.