Related Experiment Video
Updated: Jul 4, 2025
11:03
An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
8.5K
Self-consistent quantum-kinetic theory for interacting drifting electrons and force-driven phonons in a 1D system
1Department of Electrical and Computer Engineering, Francis College of Engineering, University of Massachusetts Lowell, Lowell, MA 01854, United States of America.
Summary
This study introduces a quantum-kinetic model for electron-phonon interactions in nanowires. It reveals how electron-phonon scattering influences electron transport and current, depending on electric field and temperature gradients.
Area of Science:
- Condensed Matter Physics
- Quantum Transport
Background:
- Electron-phonon interactions are crucial in nanoscale electronic devices.
- Understanding nonlinear transport in nanowires is key for future technologies.
Purpose of the Study:
- To develop a self-consistent quantum-kinetic model for strong-field electron transport in nanowires.
- To investigate the role of force-driven phonons in electron transport.
- To analyze how electron-phonon scattering affects charge current under external fields and temperature gradients.
Main Methods:
- Development of a quantum-kinetic model beyond the relaxation-time approximation.
- Simulation of electron transport in a 1D electronic-lattice system (nanowire).
- Analysis of electron-phonon scattering dynamics and their influence on current.
Main Results:
- Phonons can be driven by electron motion against an electric field.
- Electron-phonon scattering can either enhance or reduce DC-field induced electron current.
- The effect of scattering depends on the relative orientation of the electric field and temperature gradient.
Conclusions:
- The developed model accurately describes ultrafast electron-phonon scattering and correlated transports.
- Temperature is not required to describe these phenomena, offering a simplified approach.
- This work provides insights into nonlinear electron transport mechanisms in low-dimensional systems.
Related Concept Videos
02:32The de Broglie Wavelength
25.9K
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...
25.9K
01:17Theory of Metallic Conduction
1.3K
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,...
1.3K
02:45The Quantum-Mechanical Model of an Atom
42.3K
Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
42.3K
01:10First Law: Particles in One-dimensional Equilibrium
6.9K
Newton's first law of motion states that a body at rest remains at rest, or if in motion, remains in motion at constant velocity, unless acted on by a net external force. It also states that there must be a cause for any change in velocity (a change in either magnitude or direction) to occur. This cause is a net external force. For example, consider what happens to an object sliding along a rough horizontal surface. The object quickly grinds to a halt, due to the net force of friction. If...
6.9K
02:18The Bohr Model
53.7K
Following the work of Ernest Rutherford and his colleagues in the early twentieth century, the picture of atoms consisting of tiny dense nuclei surrounded by lighter and even tinier electrons continually moving about the nucleus was well established. This picture was called the planetary model since it pictured the atom as a miniature “solar system” with the electrons orbiting the nucleus like planets orbiting the sun. The simplest atom is hydrogen, consisting of a single proton as...
53.7K
01:13Force and Potential Energy in One Dimension
5.4K
Force can be calculated from the expression for potential energy, which is a function of position. The component of a conservative force, in a particular direction, equals the negative of the derivative of the corresponding potential energy with respect to the displacement in that direction. For regions where potential energy changes rapidly with displacement, the work done and force is maximum. Also, when force is applied along the positive coordinate axis, the potential energy decreases with...
5.4K