塞贝克系数与每颗粒子的比率作为基本电荷确定工具
Francisco J Peña1, César D Nuñez1, Bastian Castorene1,2
1Universidad Técnica Federico Santa María, Departamento de Física, 2390123 Valparaíso, Chile.
Physical review. E
|January 21, 2026
概括
研究人员探索了Seebeck系数 (S) 和每粒子微分 (DEP,s) 之间的联系,以表征2D材料. 他们的发现表明,s/S比率可靠地确定了基本电荷,并确定了纳米带中的清洁带间隙.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学是一种材料科学.
- 纳米技术纳米技术
背景情况:
- 塞贝克系数 (S) 通过反映能源依赖的电荷传输来表征热电性质.
- 每个粒子的微分 (DEP,s) 为电子提供了一个热力学观点.
- 在二维系统中描述电荷载体需要强大的方法,将传输和热力学特性联系起来.
研究的目的:
- 调查S和DEP (s) 之间的关系,用于2D系统中对电荷载体进行表征.
- 使用扶手椅纳米丝带作为分析S,s和它们的比率 (s/S) 取决于化学潜力的模型.
- 建立s/S作为一种补充探头,用于确定基本电荷和评估带间隙清洁度.
主要方法:
- 在椅子纳米带中,对Seebeck系数 (S) 和每粒子微分 (DEP,s) 的理论分析.
- 在不同的带宽中评估S和s,定义金属和半导体系统.
- 分析与化学潜力和温度 (室温) 相关的s/S比率.
主要成果:
- S和s在纳米带的带隙能量区域内高度相互连接.
- 比率s/S在带间隙内与基本电荷 (e) 趋同,满足凯尔文关系S=s/e.
- 对于无间隙带,s/S 在第一个传输通道的能量窗口中未定义.
结论:
- DEP与Seebeck系数 (s/S) 的比率可以作为确定基本电荷的可靠探针.
- s/S可用于识别电子带间隙的清洁度,因为它与清洁系统中的基本电荷 (e) 相匹配.
- 这种运输热力学方法为2D材料的表征提供了一个补充方法.
相关概念视频
03:00Standard 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
02:39Entropy
35.0K
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...
35.0K
01:18Entropy
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...
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
01:22Motion Of A Charged Particle In A Magnetic Field
6.7K
A charged particle experiences a force when moving through a magnetic field. Consider the field to be uniform and the charged particle to move perpendicular to it. If the field is in a vacuum, the magnetic field is the dominant factor determining the motion. Since the magnetic force is perpendicular to the direction of motion, a charged particle follows a curved path. The particle continues to follow this curved path until it forms a complete circle. Another way to look at this is that the...
6.7K
03:27Ions and Ionic Charges
78.6K
In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...
78.6K
02:42Formal Charges
40.0K
In some cases, there are seemingly more than one valid Lewis structures for molecules and polyatomic ions. The concept of formal charges can be used to help predict the most appropriate Lewis structure when more than one reasonable structure exists.
40.0K