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Woodward–Hoffmann Selection Rules and Microscopic Reversibility

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...

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Updated: Jan 17, 2026

Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices

Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices

Published on: July 11, 2025

域选择性1D莫伊尔工程和拓过渡在双层石墨烯中的拓过渡

Laiyuan Su¹, Yifan Gao¹, Yongdao Chen¹

¹Department of Physics, State Key Laboratory of Quantum Functional Materials, and Guangdong Basic Research Center of Excellence for Quantum Science, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China.

|September 15, 2025

概括

工程师可以使用一维 (1D) 摩尔特超直线来控制电子拓. 这种方法可以在范德瓦尔斯异构结构中对量子相进行域级控制.

关键词:

双叶石墨烯是双叶石墨烯的一种.异质列车工程是什么?莫埃尔超级网格莫埃尔超级网格拓式相位过渡的拓式相位过渡.

更多相关视频

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Published on: July 5, 2019

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures

Published on: December 5, 2015

相关实验视频

Last Updated: Jan 17, 2026

Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices

Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices

Published on: July 11, 2025

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Published on: July 5, 2019

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures

Published on: December 5, 2015

科学领域:

凝聚物质物理学凝聚物质物理学
材料科学材料科学材料科学
纳米技术纳米技术

背景情况:

二维 (2D) 莫雷超级网格为新的电子状态提供了一个平台.
工程电子拓和相关状态需要先进的材料设计.
异构线是操纵moiré超级格子的一个关键方法.

研究的目的:

探索通过异构链生成的一维 (1D) moiré 超级网的潜力.
为了证明对低能耗电子属性的域级控制.
研究应变对带间隙和电子转换的影响.

主要方法:

采用了原子的紧密结合模拟.
在特定的方向上,向 1D moiré 结构应用了 heterostrain.
分析了电子特性,带间隙和费米表面重建.

主要成果:

异构轨道消除了金属AA堆叠区域,并诱导了强大的带间隙.
随着应变的减少,该系统表现出绝缘体-金属-绝缘体过渡.
迪拉克圆的形成发生在关键应变 (η_c = 1.818%),伴随着费米表面重建和贝里曲率的信号反转.

结论:

域选择性1D摩尔工程是一种强大的方法来控制量子相.
这种方法可以精确控制范德瓦尔斯异构结构中的低能物理和拓.
这些发现为新型电子设备和量子技术铺平了道路.