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

Fermi Level01:18

Fermi Level

2.4K
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,...
2.4K
Fermi Level Dynamics01:12

Fermi Level Dynamics

1.0K
The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
1.0K
Ferromagnetism01:31

Ferromagnetism

3.5K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
3.5K
Field Effect Transistor01:29

Field Effect Transistor

1.7K
Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
1.7K
Biasing of FET01:22

Biasing of FET

952
Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
952
Properties of Transition Metals02:58

Properties of Transition Metals

30.8K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
30.8K

You might also read

Related Articles

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

Sort by
Same author

Monolayers of amino acid-type amphiphiles.

Advances in colloid and interface science·2023
Same author

Influence of Stereochemistry on the Monolayer Characteristics of <i>N</i>-alkanoyl-Substituted Threonine and Serine Amphiphiles at the Air-Water Interface.

Langmuir : the ACS journal of surfaces and colloids·2021
Same author

Itinerant magnetism of chromium under pressure: a DFT+DMFT study.

Journal of physics. Condensed matter : an Institute of Physics journal·2021
Same author

Revealing the Complex Nature of Bonding in the Binary High-Pressure Compound FeO_{2}.

Physical review letters·2021
Same author

Influence of linkage type (ether or ester) on the monolayer characteristics of single-chain glycerols at the air-water interface.

Physical chemistry chemical physics : PCCP·2020
Same author

Electronic correlation effects and local magnetic moments in L1<sub>0</sub>phase of FeNi.

Journal of physics. Condensed matter : an Institute of Physics journal·2020

Related Experiment Video

Updated: Apr 3, 2026

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

10.6K

Correlation-Driven Topological Fermi Surface Transition in FeSe.

I Leonov1, S L Skornyakov2,3, V I Anisimov2,3

  • 1Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, Augsburg 86135, Germany.

Physical Review Letters
|September 19, 2015
PubMed
Summary

This study reveals how expanding the FeSe lattice triggers a Lifshitz transition, altering electronic structure and magnetic correlations. This transition, linked to van Hove singularities, may induce superconductivity.

More Related Videos

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
04:51

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

Published on: July 8, 2021

3.2K
Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

8.7K

Related Experiment Videos

Last Updated: Apr 3, 2026

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

10.6K
Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
04:51

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

Published on: July 8, 2021

3.2K
Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

8.7K

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Paramagnetic FeSe exhibits complex electronic properties.
  • Understanding its phase stability is crucial for materials science applications.
  • Previous studies have not fully elucidated the interplay between electronic structure and magnetic correlations.

Purpose of the Study:

  • To compute the electronic structure and phase stability of paramagnetic FeSe.
  • To investigate the topological changes in the Fermi surface upon lattice expansion.
  • To understand the relationship between Lifshitz transitions, local moments, and magnetic correlations.

Main Methods:

  • Utilizing a combination of ab initio methods.
  • Calculating band structure.
  • Employing dynamical mean-field theory.

Main Results:

  • A topological change (Lifshitz transition) of the Fermi surface was observed upon moderate lattice expansion.
  • The Lifshitz transition led to a sharp increase in local moments.
  • Magnetic correlations reconstructed from (π,π) to (π,0).

Conclusions:

  • The observed phenomena are attributed to a correlation-induced shift of the van Hove singularity.
  • This shift, originating from specific d-bands at the M point, crosses the Fermi level.
  • Superconductivity in FeSe is proposed to be strongly influenced or induced by this van Hove singularity.