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Related Concept Videos

Phase Diagrams of Ternary Systems01:28

Phase Diagrams of Ternary Systems

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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...
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Phase Transitions01:21

Phase Transitions

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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...
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Phase Transitions02:31

Phase Transitions

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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...
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Phase Diagram01:19

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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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Phase Diagram01:24

Phase Diagram

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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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The Phase Rule01:20

The Phase Rule

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The phase rule describes the relationship between the variance (degrees of freedom), the number of components, and the number of phases in a system at equilibrium.Variance is a concept that denotes the number of independent intensive properties (properties are those that do not depend on the amount of material in the system), such as temperature, pressure, and composition, that can be altered without impacting the number of phases in equilibrium.In a single-component system, such as pure water,...
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Topological phases in two-dimensional materials: a review.

Yafei Ren1, Zhenhua Qiao, Qian Niu

  • 1ICQD, Hefei National Laboratory for Physical Sciences at Microscale, and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China. CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.

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This review explores engineered topological phases in 2D systems, focusing on topological insulators and quantum Hall effects. These materials offer potential for advanced electronics and spintronics due to unique surface states.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Topological phases exhibit insulating bulk with conductive edge/surface states.
  • These properties are crucial for fundamental physics and potential applications.
  • Dissipationless electronics and spintronics are key application areas.

Purpose of the Study:

  • To review recent advancements in engineering topologically nontrivial phases.
  • Focus on two-dimensional (2D) material systems.
  • Highlight specific topological phases like topological insulators and quantum Hall effects.

Main Methods:

  • Review of experimental and theoretical progress in 2D topological materials.
  • Analysis of material platforms including quantum wells, atomic crystals, and transition metal compounds.
  • Discussion of methods for achieving and characterizing topological phases.

Main Results:

  • Significant progress in engineering various 2D topological phases.
  • Demonstration of [Formula: see text] topological insulators, quantum anomalous Hall effects, and quantum valley Hall effects.
  • Identification of suitable material systems for realizing these phases.

Conclusions:

  • 2D systems provide a versatile platform for topological phase engineering.
  • Continued research promises breakthroughs in topological quantum devices.
  • Potential for novel electronic and spintronic applications is substantial.