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Related Concept Videos

Phase Transitions02:31

Phase Transitions

Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...
Phase Transitions01:21

Phase Transitions

A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
Phase Diagrams02:39

Phase Diagrams

A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
Phase Diagram01:24

Phase Diagram

A phase diagram is a graphical representation of the physical states of a substance under different conditions of temperature and pressure. It shows the boundaries between solid, liquid, and gas phases and the conditions at which these phases coexist in equilibrium. An area in a phase diagram represents a single phase, whereas lines or phase boundaries represent the equilibrium between two phases.In the phase diagram of water, the boundary line between the solid and liquid states illustrates...

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Related Experiment Video

Updated: May 16, 2026

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
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Published on: April 12, 2018

Excitonic phases from Weyl semimetals.

Huazhou Wei1, Sung-Po Chao, Vivek Aji

  • 1Department of Physics and Astronomy, University of California, Riverside, California 92521, USA.

Physical Review Letters
|December 11, 2012
PubMed
Summary

Strong spin-orbit coupling in Weyl semimetals can create novel chiral excitonic insulators. This new correlated phase exhibits ferromagnetism, with its magnetic moment direction controlled by the order parameter phase.

Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • Strong spin-orbit coupling (SOC) is crucial for exotic quantum phenomena.
  • Weyl semimetals feature massless, linearly dispersing fermions with conserved chirality.
  • Understanding interactions in topological materials is key to discovering new phases.

Purpose of the Study:

  • To investigate the interplay between interactions and topology in Weyl semimetals.
  • To explore the emergence of novel correlated phases of matter.
  • To characterize a predicted chiral excitonic insulator state.

Main Methods:

  • Theoretical analysis of systems with strong spin-orbit coupling.
  • Investigating the effects of electron-electron interactions on topological semimetals.
  • Developing a low-energy effective theory for the emergent phase.

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Last Updated: May 16, 2026

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Published on: April 12, 2018

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Main Results:

  • A novel chiral excitonic insulator phase is predicted.
  • This phase arises from the interplay of interaction and topology in Weyl semimetals.
  • The chiral excitonic insulator is characterized by a complex vectorial order parameter that gaps Weyl nodes.
  • The predicted state exhibits spontaneous ferromagnetism, with the order parameter's phase dictating the magnetic moment direction.

Conclusions:

  • The study reveals a new avenue for realizing exotic quantum phases in topological materials.
  • Chiral excitonic insulators represent a unique state of matter with potential applications in spintronics.
  • The findings highlight the importance of considering interactions in topological semimetal systems.