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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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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.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons00:58

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Replacing each alpha-hydrogen in chloroethane by bromine (or a different functional group) yields a pair of enantiomers. Such protons are called prochiral or enantiotopic and are related by a mirror plane. Enantiotopic protons are chemically equivalent in an achiral environment. Because most proton NMR spectra are recorded using achiral solvents, enantiotopic hydrogens yield a single signal.
In chiral compounds such as 2-butanol, replacing the methylene hydrogens at C3 produces a pair of...
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Chirality in Nature02:30

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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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Chirality02:25

Chirality

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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
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Chirality at Nitrogen, Phosphorus, and Sulfur02:30

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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
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Related Experiment Video

Updated: Jan 15, 2026

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional &#960;-conjugate Systems
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Quasi-Nonvolatile Electrical Manipulation of Chiral Raman Signals.

Junze Li1, Hongzhi Shen1, Wendian Yao1

  • 1School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China.

Small (Weinheim an Der Bergstrasse, Germany)
|October 14, 2025
PubMed
Summary

Scientists demonstrate quasi-nonvolatile electrical control of chiral Raman signals in a WSe2 device. This breakthrough enables on/off switching of signals, paving the way for advanced valleytronics applications.

Keywords:
chiral Raman signalsfloating gatenon‐volatile electrical manipulationtransition metal dichalcogenides

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Chiral Raman spectroscopy probes material properties.
  • Exciton dynamics influence optical signals.
  • Valleytronics aims to utilize electron valley properties for computation.

Purpose of the Study:

  • To demonstrate quasi-nonvolatile electrical manipulation of chiral Raman signals.
  • To investigate the role of excitons in signal switching.
  • To explore potential for high-temperature valleytronics.

Main Methods:

  • Fabrication of a floating-gate device using monolayer WSe2/h-BN/graphene heterostructure.
  • Electrical gating to control doping levels and exciton species.
  • Raman spectroscopy to measure chiral signals and valley polarization.

Main Results:

  • Achieved quasi-nonvolatile switching of chiral Raman signals with a large on/off ratio.
  • Demonstrated conversion between free and charged excitons via electrical gating.
  • Observed chiral Raman signals with over 60% circular polarization and low decoherence.

Conclusions:

  • Electrical control of chiral Raman signals is feasible in WSe2-based heterostructures.
  • The device enables on/off switching of signals by manipulating exciton states.
  • The findings support the development of robust high-temperature valleytronics.