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Related Concept Videos

P-N junction01:11

P-N junction

611
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
611
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

431
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
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...
431

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Updated: Aug 19, 2025

Monitoring Conformational Dynamics of Single Unmodified Proteins using Plasmonic Nanotweezers
09:33

Monitoring Conformational Dynamics of Single Unmodified Proteins using Plasmonic Nanotweezers

Published on: March 21, 2025

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Plasmon Squeezing in Single-Molecule Junctions.

Lei-Lei Nian1, Tao Wang2, Jing-Tao Lü2

  • 1School of Physics and Astronomy, Yunnan University, 650091Kunming, People's Republic of China.

Nano Letters
|November 30, 2022
PubMed
Summary
This summary is machine-generated.

Researchers theoretically predict squeezed light emission from plasmon modes in a scanning tunneling microscope (STM) single molecular junction. This breakthrough could advance quantum technologies by enabling atomic-scale control of nonclassical light states.

Keywords:
gap plasmonquantum statisticsscanning tunneling microscopesingle molecular junctionsqueezing

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Area of Science:

  • Quantum optics
  • Condensed matter physics
  • Nanotechnology

Background:

  • Scanning tunneling microscopy (STM) enables electrical generation and atomic-scale manipulation of nonclassical light states.
  • Squeezed light emission, crucial for quantum technologies, has not been demonstrated in STM platforms.

Purpose of the Study:

  • To theoretically predict squeezed light emission from plasmon modes in an STM single molecular junction.
  • To explore the role of molecular coherence and anharmonicity in generating squeezed light.
  • To demonstrate control over the statistical properties of the emitted light.

Main Methods:

  • Theoretical modeling of a coupled plasmon-molecule-exciton system in an STM junction.
  • Analysis of light emission under external laser drive.
  • Investigation of energy ladder excitation for controlling quantum properties.

Main Results:

  • Prediction of squeezed light emission from plasmon modes in an STM junction.
  • Demonstration of squeezing via molecular coherence and anharmonic energy spectrum.
  • Tunable sub-Poissonian or super-Poissonian statistical properties of squeezed plasmons.
  • Simultaneous squeezing of molecular excitonic modes.

Conclusions:

  • STM-induced luminescence can generate squeezed light, a significant advancement for quantum technologies.
  • Molecular coherence plays a key role in achieving squeezing beyond traditional photon-photon interactions.
  • This work opens new avenues for controlling quantum states of light at the nanoscale.