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Related Concept Videos

Phase Diagrams of Ternary Systems01:28

Phase Diagrams of Ternary Systems

Consider a ternary system, which is composed of three components: water (W), ethanoic acid (E), and trichloromethane (T). Here, Ethanoic acid (E) is fully miscible with both water (W) and trichloromethane (T), meaning it can mix entirely with either of them. However, water and trichloromethane have partial miscibility, meaning they can only mix to a certain extent, beyond which two separate phases will form.The phase diagram of a ternary system is represented as an equilateral triangle, where...
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...
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
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...
Phase Diagram01:19

Phase Diagram

The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).

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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
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Correlation effects on 3D topological phases: from bulk to boundary.

Ara Go1, William Witczak-Krempa, Gun Sang Jeon

  • 1Department of Physics and Astronomy and Center for Theoretical Physics, Seoul National University, Seoul, Korea.

Physical Review Letters
|September 26, 2012
PubMed
Summary

Researchers uncovered a novel interacting axion insulator phase in pyrochlore iridates using advanced computational methods. This discovery advances the understanding of topological quantum matter and its potential applications.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Materials Science

Background:

  • Topological phases of quantum matter are characterized by unique properties like quantized electromagnetic responses and protected surface states, not by conventional order parameters.
  • Pyrochlores, particularly iridates, are complex correlated oxides that serve as a promising platform for exploring exotic quantum phenomena.
  • Understanding interacting topological insulators and topological Weyl semimetals is crucial for advancing quantum matter research.

Purpose of the Study:

  • To investigate topological phenomena in a model of three-dimensional correlated complex oxides, specifically pyrochlore iridates.
  • To explore interacting topological insulators and topological Weyl semimetals within this model.
  • To characterize the magnetoelectric topological response and identify novel topological phases.

Main Methods:

  • Utilized cellular dynamical mean-field theory (CDMFT), a powerful computational technique for incorporating quantum many-body effects.
  • Evaluated the magnetoelectric topological response coefficient, a key invariant for characterizing topological phases in correlated systems.
  • Studied the evolution of topological boundary states under the influence of interactions.

Main Results:

  • Identified an interacting axion insulator phase, which was not apparent in simpler mean-field studies.
  • Confirmed the presence of topological phases, including interacting topological insulators and topological Weyl semimetals.
  • Corroborated bulk findings by observing the behavior of topological boundary states with increasing interactions.

Conclusions:

  • The study reveals a previously hidden interacting axion insulator phase in pyrochlore iridates, highlighting the importance of many-body effects.
  • Demonstrates the utility of CDMFT in uncovering complex topological states in correlated materials.
  • Provides insights for experimental searches for correlated materials exhibiting symmetry-protected topological order.