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Related Concept Videos

Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

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...
Continuous Charge Distributions01:17

Continuous Charge Distributions

Imagine a bucket of water. It contains many molecules, of the order of 1026 molecules. Thus, although it contains discrete elements (molecules) at the microscopic level, macroscopically, it can be considered continuous. Small volume elements of water, infinitesimal compared to the bulk of the bucket's volume, still contain many molecules. Under this framework, quantized matter is approximated as continuous for practical purposes.
The electric charge can also be subjected to an analogical...
Ampere-Maxwell's Law: Problem-Solving01:17

Ampere-Maxwell's Law: Problem-Solving

A parallel-plate capacitor with capacitance C, whose plates have area A and separation distance d, is connected to a resistor R and a battery of voltage V. The current starts to flow at t = 0. What is the displacement current between the capacitor plates at time t? From the properties of the capacitor, what is the corresponding real current?
To solve the problem, we can use the equations from the analysis of an RC circuit and Maxwell's version of Ampère's law.
For the first part of the problem,...
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
Drift Velocity01:19

Drift Velocity

The high speed of electrical signals results from the fact that the force between charges acts rapidly at a distance. Thus, when a free charge is forced into a wire, the incoming charge pushes other charges ahead due to the repulsive force between like charges. These moving charges move the charges farther down the line. The density of charge in a system cannot easily be increased, so the signal is passed on rapidly. The resulting electrical shock wave moves through the system at nearly the...
Charge on a Conductor01:26

Charge on a Conductor

An interesting property of a conductor in static equilibrium is that extra charges on the conductor end up on its outer surface, regardless of where they originate. Consider a hollow metallic conductor with a uniform surface charge density. Since the conductor itself is in electrostatic equilibrium, there should not be any electric field inside the conductor. Now, assume a Gaussian surface enclosing the hollow portion. Applying Gauss's law, the inner surface of the hollow conductor will not...

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Related Experiment Video

Updated: May 13, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Fluctuating charge-density waves in a cuprate superconductor.

Darius H Torchinsky, Fahad Mahmood, Anthony T Bollinger

    Nature Materials
    |February 26, 2013
    PubMed
    Summary
    This summary is machine-generated.

    Dynamic charge-density waves (CDWs) were detected in cuprate superconductors using ultrafast spectroscopy. This new method reveals fluctuating CDWs in underdoped materials, offering insights into high-temperature superconductivity (HTS).

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    Published on: March 24, 2019

    Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
    08:53

    Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

    Published on: October 9, 2012

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    Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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    Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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    Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
    08:53

    Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

    Published on: October 9, 2012

    Area of Science:

    • Condensed Matter Physics
    • Materials Science
    • Spectroscopy

    Background:

    • Cuprate materials exhibit high-temperature superconductivity (HTS) alongside complex charge and spin ordering phenomena.
    • Static charge-density waves (CDWs) are typically observed in cuprates only under specific doping conditions or external fields.
    • The presence and role of dynamic CDWs in cuprates, particularly their relationship with HTS, remain largely unexplored.

    Discussion:

    • A novel ultrafast spectroscopy technique is introduced for detecting and characterizing CDW fluctuations.
    • The study investigates CDW dynamics in both underdoped and optimally doped La(x)Sr(y)CuO4 films.
    • Results highlight the temperature-dependent lifetime of CDW fluctuations in underdoped cuprates.

    Key Insights:

    • Dynamic CDW excitations were observed in an underdoped La(1.9)Sr(0.1)CuO4 film, persisting up to 100 K.
    • The lifetime of these dynamic CDWs was measured, showing a decrease from 2 ps at 5 K to 0.5 ps at 100 K.
    • No evidence of fluctuating CDWs was found in an optimally doped La(1.84)Sr(0.16)CuO4 film, supporting a competition scenario between CDW and superconductivity.

    Outlook:

    • This research establishes a new spectroscopic pathway for investigating dynamic order parameters in superconductors.
    • The findings provide crucial data for understanding the interplay between CDWs and HTS in cuprate systems.
    • The developed methodology can be extended to study fluctuating orders in a broader range of quantum materials.