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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Fermi Level Dynamics01:12

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The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
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The de Broglie Wavelength02:32

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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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.
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Spin Gapless Quantum Materials and Devices.

Muhammad Nadeem1,2, Xiaolin Wang1,2

  • 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.)
|July 4, 2024
PubMed
Summary
This summary is machine-generated.

Spin gapless quantum materials offer a new perspective for quantum technologies by bridging fundamental science and device applications. Understanding their unique band structures is key to advancing quantum computing and spintronics.

Keywords:
quantum anomalous Hall insulatorsquantum spin/valley Hall insulatorsspin gapless nodal‐line semimetalsspin gapless semiconductorstopological electronicstopological spintronics

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Area of Science:

  • Quantum Materials Science
  • Condensed Matter Physics
  • Spintronics

Background:

  • Quantum technologies promise enhanced functionalities but face challenges due to the gap between fundamental science and implementation.
  • A new perspective is needed to bridge this gap and fully capitalize on the quantum advantage.

Purpose of the Study:

  • To review spin gapless quantum materials from the perspective of fundamental understanding and device applications.
  • To highlight their role in understanding band structure engineering and topological quantum materials.

Main Methods:

  • Discussion of spin gapless quantum materials with fully spin-polarized bands and electron/hole transport.
  • Simulation of these materials using minimal two-band models.
  • Analysis of conventional bulk transport and topological boundary transport.

Main Results:

  • Spin gapless quantum materials can be simulated by minimal two-band models, aiding in understanding band structure engineering.
  • Various spin gapless band dispersions are fundamental to understanding the quantum anomalous Hall effect.
  • Spintronic device aspects and advantages in topological field-effect transistor models are reviewed.

Conclusions:

  • Spin gapless quantum materials are crucial for advancing quantum technologies by connecting fundamental quantum phenomena with practical applications.
  • Their unique electronic properties and band structures are key to developing next-generation quantum devices and understanding topological phenomena.