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Updated: May 28, 2025

Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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在双层石墨烯中,Spin-valley保护了克莱默斯对

Artem O Denisov1, Veronika Reckova2, Solenn Cances2

  • 1Laboratory for Solid State Physics, ETH Zurich, Zurich, Switzerland. adenisov@phys.ethz.ch.

Nature nanotechnology
|February 10, 2025
PubMed
概括

比莱尔石墨烯 (BLG) 量子点表现出长期存在的克拉默斯状态,显示38秒的旋转谷放松时间. 这一突破为先进的半导体量子比特铺平了道路,超越了传统的自旋量子比特.

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
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