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Related Concept Videos

¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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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...
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NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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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...
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Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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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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Contact-dependent Signaling01:19

Contact-dependent Signaling

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Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
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Rules of Connectivity-Dependent Phonon Interference in Molecular Junctions.

Liyuan Zheng1, Erfan Norouzi Farahani1, Abdalghani H S Daaoub1

  • 1Quantum Device Modelling Group, School of Engineering, University of Warwick, CV4 7AL Coventry, United Kingdom.

Nano Letters
|April 8, 2025
PubMed
Summary

Phonon interference in molecular junctions differs from electron quantum interference. Meta-connected molecular junctions can show higher thermal conductance due to multiple phonon pathways, unlike electronic systems.

Keywords:
phonon interferencephonon transportsingle-molecule junctionthermal conductancethermoelectricity

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Area of Science:

  • Condensed Matter Physics
  • Nanoscience
  • Materials Science

Background:

  • Controlling nanoscale heat flow is essential for developing advanced electronic devices.
  • Phonons are the primary heat carriers in molecules and exhibit wave-like properties, leading to interference phenomena.
  • Understanding phonon transport in molecular junctions is key to thermal management at the nanoscale.

Purpose of the Study:

  • To investigate and compare phonon interference (PI) in molecular junctions with electron quantum interference (QI).
  • To explore how different connection points (meta vs. para) affect thermal conductance in molecular junctions.
  • To provide insights into designing molecular systems for enhanced thermal management and thermoelectric applications.

Main Methods:

  • Theoretical modeling and simulation of phonon transport in molecular junctions connected to gold electrodes.
  • Analysis of interference patterns in single-channel and multichannel phonon transport.
  • Investigation of the impact of dephasing effects on phonon interference.

Main Results:

  • Phonon interference in molecular junctions exhibits distinct behavior compared to electron quantum interference.
  • Meta-connected molecular junctions (benzenedithiol, OPE3, etc.) can display higher thermal conductance than para-connected ones.
  • Multiple phonon transmission channels and long-range interatomic interactions contribute to enhanced thermal conductance, phenomena not observed in electronic systems.
  • Single-channel phonon transport shows an inverted interference pattern relative to electrons, while multichannel transport resembles QI.
  • Dephasing effects have a minimal impact on phonon interference at the nanoscale.

Conclusions:

  • Phonon interference is a significant factor in nanoscale heat transport within molecular junctions.
  • Molecular junction geometry and connectivity critically influence thermal conductance.
  • The findings offer a foundation for engineering molecular materials to control heat flow for advanced electronic and thermoelectric devices.