Related Experiment Video
Updated: Jul 31, 2026
05:20
Characterization of Thermal Transport in One-dimensional Solid Materials
Published on: January 26, 2014
Inelastic scattering and local heating in atomic gold wires
Thomas Frederiksen1, Mads Brandbyge, Nicolás Lorente
1MIC-Department of Micro and Nanotechnology, Technical University of Denmark, DK-2800 Lyngby, Denmark. thr@mic.dtu.dk
Physical Review Letters
|February 9, 2005
Summary
We developed a computational method to include inelastic scattering in molecular electronics. This approach accurately predicts conductance in gold wires and explains experimental observations like mode selectivity and phonon heating.
Area of Science:
- Computational physics
- Materials science
- Molecular electronics
Background:
- Inelastic scattering effects are crucial for accurate modeling of molecular electronic devices.
- First-principles calculations are essential for understanding electron transport phenomena at the nanoscale.
Purpose of the Study:
- To develop and apply a first-principles computational scheme incorporating inelastic scattering for molecular electronics.
- To investigate the influence of strain on the electronic transport properties of gold nanowires.
Main Methods:
- Implementation of inelastic scattering within a density-functional theory (DFT) framework.
- Simulation of four-atom gold wires under varying strain conditions.
- Calculation of nonlinear differential conductance as a function of device bias.
Main Results:
- The developed theory quantitatively matches experimental results for gold nanowires.
- The method successfully explains the experimentally observed mode selectivity in electron transport.
- Signatures of phonon heating were identified, providing insights into energy dissipation mechanisms.
Conclusions:
- The first-principles method including inelastic scattering provides a powerful tool for molecular electronics.
- The study elucidates the role of strain and inelastic processes in determining the conductance of atomic wires.
- This work offers a pathway to better understand and design nanoscale electronic devices.
Related Concept Videos
02:32The de Broglie Wavelength
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...
01:14Atomic Nuclei: Nuclear Spin State Population Distribution
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
01:14Diamagnetic Shielding of Nuclei: Local Diamagnetic Current
An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
01:27Magnetic Field Due To A Thin Straight Wire
Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
01:17Theory of Metallic Conduction
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
01:27Atomic Spectroscopy: Effects of Temperature
Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature from...
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature from...