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Related Concept Videos

Magnetic Damping01:17

Magnetic Damping

583
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
583
Damped Oscillations01:07

Damped Oscillations

6.1K
In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
6.1K
Types of Damping01:20

Types of Damping

6.7K
If the amount of damping in a system is gradually increased, the period and frequency start to become affected because damping opposes, and hence slows, the back and forth motion (the net force is smaller in both directions). If there is a very large amount of damping, the system does not even oscillate; instead, it slowly moves toward equilibrium. In brief, an overdamped system moves slowly towards equilibrium, whereas an underdamped system moves quickly to equilibrium but will oscillate about...
6.7K
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

9.4K
A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
9.4K
Forced Oscillations01:06

Forced Oscillations

6.8K
When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
6.8K
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

365
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
365

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Related Experiment Video

Updated: Sep 25, 2025

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Damping of Pseudo-Goldstone Fields.

Luca V Delacrétaz1, Blaise Goutéraux2, Vaios Ziogas2

  • 1Kadanoff Center for Theoretical Physics, University of Chicago, Chicago, Illinois 60637, USA.

Physical Review Letters
|April 27, 2022
PubMed
Summary

Approximate symmetries lead to pseudo-Goldstone modes. Hydrodynamics shows their damping depends only on mass and transport, with implications for materials like superconductors.

Area of Science:

  • Condensed Matter Physics
  • High Energy Physics
  • Quantum Field Theory

Background:

  • Approximate symmetries are common in nature.
  • Spontaneous breaking of these symmetries results in pseudo-Goldstones.
  • Hydrodynamics describes dissipative effects at long scales.

Purpose of the Study:

  • To investigate the damping of pseudo-Goldstones in systems with approximate symmetries.
  • To establish a connection between pseudo-Goldstone damping and hydrodynamic transport coefficients.
  • To explore the implications of this damping mechanism in various physical systems.

Main Methods:

  • Analysis within the framework of hydrodynamics at non-zero temperature.
  • Considering the limit of weak explicit symmetry breaking.

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  • Relating damping to mass and diffusive transport coefficients.

    • Main Results:

    • Pseudo-Goldstone damping is determined by their mass and diffusive transport coefficients.
    • This mechanism explains disorder-independent resistivity in electronic density waves.
    • A linear temperature dependence of resistivity is possible under specific diffusivity conditions.

    Conclusions:

    • The damping of pseudo-Goldstones is universally governed by their mass and transport properties.
    • This finding offers insights into the behavior of strongly correlated electron systems, including strange metals.
    • The study provides a unified perspective on pseudo-Goldstone dynamics across diverse physical phenomena.