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相关概念视频

Entropy02:39

Entropy

34.9K
Salt particles that have dissolved in water never spontaneously come back together in solution to reform solid particles. Moreover, a gas that has expanded in a vacuum remains dispersed and never spontaneously reassembles. The unidirectional nature of these phenomena is the result of a thermodynamic state function called entropy (S). Entropy is the measure of the extent to which the energy is dispersed throughout a system, or in other words, it is proportional to the degree of disorder of a...
34.9K
Entropy01:18

Entropy

3.5K
The first law of thermodynamics is quantitatively formulated via an equation relating the internal energy of a system, the heat exchanged by it, and the work done on it. A quantitative formulation of the second law of thermodynamics leads to defining a state function, the entropy.
When an ideal gas expands isothermally, the disorder in the gas increases. From the molecular perspective, the gas molecules have more volume to move around in.
Consider an infinitesimal step in the expansion, which...
3.5K
Entropy Change in Reversible Processes01:10

Entropy Change in Reversible Processes

3.2K
In the Carnot engine, which achieves the maximum efficiency between two reservoirs of fixed temperatures, the total change in entropy is zero. The observation can be generalized by considering any reversible cyclic process consisting of many Carnot cycles. Thus, it can be stated that the total entropy change of any ideal reversible cycle is zero.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
3.2K
Entropy and the Second Law of Thermodynamics01:20

Entropy and the Second Law of Thermodynamics

4.8K
The second law of thermodynamics can be stated quantitatively using the concept of entropy. Entropy is the measure of disorder of the system.
The relation  between entropy and disorder can be illustrated with the example of the phase change of ice to water. In ice, the molecules are located at specific sites giving a solid state, whereas, in a liquid form, these molecules are much freer to move. The molecular arrangement has therefore become more randomized. Although the change in average...
4.8K
The Hall Effect01:30

The Hall Effect

4.1K
Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
4.1K
Standard Entropy Change for a Reaction03:00

Standard Entropy Change for a Reaction

24.0K
Entropy is a state function, so the standard entropy change for a chemical reaction (ΔS°rxn) can be calculated from the difference in standard entropy between the products and the reactants.
24.0K

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通过透工程来定制强大的量子异常霍尔效应.

Syeda Amina Shabbir1, Frank Fei Yun1, Muhammad Nadeem1

  • 1Institute for Superconducting and Electronic Materials (ISEM), Faculty of Engineering and Information Sciences (EIS), University of Wollongong, Wollongong, New South Wales, 2525, Australia.

Advanced materials (Deerfield Beach, Fla.)
|June 3, 2025
PubMed
概括
此摘要是机器生成的。

2D磁体中的 Entropy 工程为实现量子异常霍尔 (QAH) 效应提供了一条新的途径. 这种方法将迪拉克半金属转化为迪拉克自旋无间隙半导体,使强大的QAH相实现成为可能.

关键词:
迪拉克半金属公司高的材料高的材料.量子异常的大厅效应量子材料是一种量子材料.旋转无间隙半导体的半导体拓运输 拓运输 拓运输

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科学领域:

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 量子材料是一种量子材料.

背景情况:

  • 具有定制性质的量子材料对于先进应用至关重要.
  • 量子异常霍尔效应 (QAH) 是拓材料中的一个关键现象.
  • 实现一个强大的QAH效应与空隙散热带是一个重大挑战.

研究的目的:

  • 提出一种新的设计概念,用于强大的QAH效应,使用二维磁铁中的工程.
  • 为了研究配置对单层VCl3.3电子带结构对电子带结构的影响.
  • 为了证明狄拉克半金属的转化到支持强大的QAH阶段的状态.

主要方法:

  • 使用第一原理计算来研究单层过渡金属三化物VCl3.3.
  • 通过将各种过渡金属 (Ti,Cr,Fe,Co) 纳入VCl3蜂结构来操纵配置.
  • 分析带结构的重新规范化,包括带平面化和能量转移,由于工程.

主要成果:

  • 透工程在单层VCl3.3中打破平面镜面对称性,反转和/或旋转反转.
  • 该过程将铁磁迪拉克半金属转化为迪拉克自旋无间隙半导体.
  • 实现了一个强大的QAH阶段,具有完全间隙的散带分散,从而实现纯粹的拓边缘状态传输.

结论:

  • 配置工程为设计强大的QAH材料提供了一个可行的策略.
  • 这种方法有助于在二维磁铁中实现量子异常霍尔效应.
  • 这些发现为开发基于工程材料的新型量子设备铺平了道路.