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

Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

45.1K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
45.1K
Semiconductors01:22

Semiconductors

983
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...
983
IR Spectrum Peak Intensity: Dipole Moment01:20

IR Spectrum Peak Intensity: Dipole Moment

859
The dipole moment of a bond is the product of the partial charge on either atom and the distance between them. Dipole moments influence the efficiency of IR absorption and the peak intensity. When a bond with a dipole moment is placed in an electric field, the direction of the field determines if the bond is compressed or stretched. Electromagnetic radiation consists of an electric field component that rapidly reverses direction. It follows that polar bonds are alternately stretched and...
859
Predicting Molecular Geometry02:27

Predicting Molecular Geometry

36.6K
VSEPR Theory for Determination of Electron Pair Geometries
36.6K
IR Absorption Frequency: Delocalization01:04

IR Absorption Frequency: Delocalization

960
Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR...
960
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.2K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
28.2K

You might also read

Related Articles

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

Sort by
Same author

Visualizing the impact of quenched disorder on 2D electron Wigner solids.

Nature·2026
Same author

Two-component exciton condensates in an electron-hole bilayer.

Nature·2026
Same author

Dental professionals' knowledge and awareness of teledentistry.

BMC oral health·2026
Same author

Electron-doping-induced destabilization of the dimerized insulating state in monolayer IrTe<sub>2</sub>.

Nanoscale·2026
Same author

Association between visceral adiposity indices and retinal microvascular parameters stratified by urinary protein status.

BMC ophthalmology·2026
Same author

Retraction notice to "Cold atmospheric plasma induces the curing mechanism of diabetic wounds by regulating the oxidative stress mediators iNOS and NO, the pyroptotic mediators NLRP-3, Caspase-1 and IL-1β and the angiogenesis mediators VEGF and Ang-1" [Biomedicine & Pharmacotherapy 169 (2023) 115934].

Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie·2026
Same journal

Large-scale discovery and annotation of substructure patterns in mass spectrometry profiles.

Nature communications·2026
Same journal

Salmonella SopB suppresses post-transcriptionally regulated cytokine release to reduce early tissue inflammation and delay disease progression.

Nature communications·2026
Same journal

A human-specific microRNA controls the timing of excitatory synaptogenesis.

Nature communications·2026
Same journal

An HMA-like integrated domain in the wheat tandem kinase WTK4 recognises an RNase-like pathogen effector.

Nature communications·2026
Same journal

Learning regularities in noise engages both neural predictive activity and representational changes.

Nature communications·2026
Same journal

The H3K4 methyltransferase KMT2D is an essential cofactor for GATA1 at erythroid gene enhancers.

Nature communications·2026
See all related articles

Related Experiment Video

Updated: Oct 3, 2025

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
06:57

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon

Published on: July 17, 2020

2.3K

Large-gap insulating dimer ground state in monolayer IrTe2.

Jinwoong Hwang1,2,3, Kyoo Kim4, Canxun Zhang5,6,7

  • 1Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA. jinwoonghwang@lbl.gov.

Nature Communications
|February 17, 2022
PubMed
Summary
This summary is machine-generated.

Monolayer 1T-IrTe2 forms a unique insulating state with a large band gap, unlike its metallic bulk. This 2D van der Waals material

More Related Videos

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
08:53

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

Published on: October 9, 2012

17.8K
Total Internal Reflection Absorption Spectroscopy TIRAS for the Detection of Solvated Electrons at a Plasma-liquid Interface
08:50

Total Internal Reflection Absorption Spectroscopy TIRAS for the Detection of Solvated Electrons at a Plasma-liquid Interface

Published on: January 24, 2018

13.9K

Related Experiment Videos

Last Updated: Oct 3, 2025

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
06:57

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon

Published on: July 17, 2020

2.3K
Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
08:53

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

Published on: October 9, 2012

17.8K
Total Internal Reflection Absorption Spectroscopy TIRAS for the Detection of Solvated Electrons at a Plasma-liquid Interface
08:50

Total Internal Reflection Absorption Spectroscopy TIRAS for the Detection of Solvated Electrons at a Plasma-liquid Interface

Published on: January 24, 2018

13.9K

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Two-dimensional (2D) van der Waals materials display unique electronic properties distinct from their bulk counterparts.
  • Reduced screening and symmetry breaking in 2D materials lead to novel electronic phases.
  • Interlayer coupling significantly influences the electronic behavior of layered materials.

Purpose of the Study:

  • To investigate the electronic ground state of monolayer 1T-IrTe2.
  • To understand the mechanisms driving the formation of insulating phases in 2D materials.
  • To explore the role of electron-phonon coupling and charge ordering in 2D van der Waals systems.

Main Methods:

  • Angle-resolved photoemission spectroscopy (ARPES) for electronic structure determination.
  • Scanning tunneling microscopy/spectroscopy (STM/STS) for surface morphology and local electronic properties.
  • First-principles calculations (e.g., Density Functional Theory) for theoretical validation.

Main Results:

  • Demonstration of a unique insulating 2 × 1 dimer ground state in monolayer 1T-IrTe2.
  • Observation of a large band gap in the monolayer, contrasting with metallic bulk forms.
  • Identification of collective contributions from phonon instabilities, charge instabilities, and local bond formation to the ground state.

Conclusions:

  • Monolayer 1T-IrTe2 exhibits a distinct insulating phase due to reduced interlayer coupling.
  • The interplay of electron-phonon coupling, charge ordering, and local bonding stabilizes this 2D electronic phase.
  • Findings offer insights into engineering properties of 2D materials by controlling interactions in reduced dimensions.