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Related Concept Videos

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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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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.
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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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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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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Spin-valley Rashba monolayer laser.

Kexiu Rong1, Xiaoyang Duan1, Bo Wang2

  • 1Atomic-Scale Photonics Laboratory, Russell Berrie Nanotechnology Institute, and Helen Diller Quantum Center, Technion - Israel Institute of Technology, Haifa, Israel.

Nature Materials
|July 6, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel spin-optical laser using a tungsten disulfide (WS₂) monolayer. This atomic-scale light source demonstrates robust spin polarization and coherence at room temperature, paving the way for advanced optical technologies.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Optoelectronics

Background:

  • Direct-bandgap transition metal dichalcogenide monolayers exhibit valley-contrasting optical selection rules, making them promising for spin-optical applications.
  • Atomic-scale light sources are crucial for next-generation optoelectronic devices.

Purpose of the Study:

  • To demonstrate a spin-optical monolayer laser utilizing a WS₂ monolayer integrated into a microcavity.
  • To investigate the generation and properties of photonic spin-valley resonances.

Main Methods:

  • Incorporation of a WS₂ monolayer into a heterostructure microcavity.
  • Generation of spin-valley modes via photonic Rashba-type spin splitting of a bound state in the continuum.
  • Utilizing inversion symmetry breaking to induce photonic spin-orbit interaction.

Main Results:

  • Demonstration of a functional spin-optical monolayer laser with intrinsic spin polarizations.
  • Observation of high spatial and temporal coherence in the laser output.
  • Achieved valley coherence in the WS₂ monolayer under arbitrary pump polarizations at room temperature.
  • Exhibited symmetry-enabled robustness features.

Conclusions:

  • The developed monolayer laser integrates electron and photon spins for coherent light generation.
  • Monolayer-integrated spin-valley microcavities offer new possibilities for classical and non-classical spin-optical light sources.
  • This work advances the development of atomic-scale, coherent spin-optical devices.