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Related Concept Videos

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.5K
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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Isomerism in Alkenes02:01

Isomerism in Alkenes

14.5K
Alkenes like 1-butene and 2-butene exhibit constitutional isomerism, as they differ in the position of the double bond. Further, 2-butene exhibits stereoisomerism and exists as two distinct compounds differing in spatial arrangement.
An isomer is called cis-2-butene when the methyl groups are on the same side of the double bond, and the other stereoisomer, in which methyl groups are on the opposite side of the double bond, is called trans-2-butene. The cis and trans stereoisomers are not...
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Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

4.0K
Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
4.0K
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.5K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
2.5K
π Molecular Orbitals of 1,3-Butadiene01:24

π Molecular Orbitals of 1,3-Butadiene

11.1K
Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
11.1K
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

4.6K
The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
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Updated: Dec 26, 2025

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

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Type-II Ising pairing in few-layer stanene.

Joseph Falson1, Yong Xu2,3,4, Menghan Liao2

  • 1Max Planck Institute for Solid State Research, Stuttgart 70569, Germany.

Science (New York, N.Y.)
|March 14, 2020
PubMed
Summary
This summary is machine-generated.

Few-layer stanene exhibits a unique Ising pairing mechanism in two-dimensional superconductors, driven by spin-orbit locking. This discovery reveals an enhanced in-plane critical magnetic field at ultralow temperatures.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Spin-orbit coupling is crucial for topological materials and Ising pairing in 2D superconductors.
  • Ising pairing typically requires inversion symmetry-breaking and supports large in-plane magnetic fields.
  • Few-layer stanene (epitaxially strained gray tin) is a recently discovered superconductor.

Purpose of the Study:

  • To investigate the pairing mechanism in few-layer stanene.
  • To determine if stanene exhibits Ising pairing and its underlying mechanism.
  • To explore the temperature dependence of its critical magnetic field.

Main Methods:

  • Theoretical analysis of electronic band structure near the Γ-point.
  • Experimental measurement of in-plane critical magnetic fields at ultralow temperatures.

Main Results:

  • Few-layer stanene displays a distinct Ising pairing mechanism involving bands with different orbital indices.
  • This pairing occurs due to spin-orbit locking, independent of inversion symmetry-breaking.
  • The in-plane upper critical field shows significant enhancement at ultralow temperatures, consistent with theoretical predictions.

Conclusions:

  • Stanene represents a novel platform for studying Ising superconductivity.
  • The observed pairing mechanism offers new avenues for designing superconductors with high critical fields.
  • This finding advances the understanding of spin-orbit coupling effects in novel 2D materials.