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Related Concept Videos

Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

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An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
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RLC Circuit as a Damped Oscillator01:30

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An RLC circuit combines a resistor, inductor, and capacitor, connected in a series or parallel combination.
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Design Example: Underdamped Parallel RLC Circuit01:17

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Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
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Forced Oscillations01:06

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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.
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Oscillations about an Equilibrium Position01:04

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Stability is an important concept in oscillation. If an equilibrium point is stable, a slight disturbance of an object that is initially at the stable equilibrium point will cause the object to oscillate around that point. For an unstable equilibrium point, if the object is disturbed slightly, it will not return to the equilibrium point. There are three conditions for equilibrium points—stable, unstable, and half-stable. A half-stable equilibrium point is also unstable, but is named so...
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Damped Oscillations01:07

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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.
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Related Experiment Video

Updated: Apr 27, 2026

Fabrication and Testing of Microfluidic Optomechanical Oscillators
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Bloch Diode.

M Houzet1, T Vakhtel2, J S Meyer1

  • 1Pheliqs, IRIG, Grenoble INP, CEA, Univ. Grenoble Alpes, F-38000 Grenoble, France.

Physical Review Letters
|April 25, 2026
PubMed
Summary

Researchers predict a dual Bloch diode effect in Cooper pair transistors, showing critical voltage asymmetry similar to the Josephson diode effect. This phenomenon arises from asymmetric Bloch bands and could be realized in superconducting circuits.

Area of Science:

  • Quantum electronics
  • Solid-state physics
  • Superconductivity

Background:

  • The Josephson diode effect, an asymmetry in critical currents, is a recent area of interest.
  • It has been realized in asymmetric Superconducting Quantum Interference Devices (SQUIDs).

Purpose of the Study:

  • To predict a dual version of the Josephson diode effect in a gate-tunable Cooper pair transistor.
  • To investigate the conditions and mechanisms for this dual effect, termed the Bloch diode effect.

Main Methods:

  • Theoretical prediction of the Bloch diode effect.
  • Analysis of a Cooper pair transistor in series with a resistive environment.
  • Examination of Bloch band dispersion asymmetry.

Main Results:

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  • Prediction of a "Bloch diode effect" in Cooper pair transistors.
  • This effect manifests as critical voltage asymmetry at opposite polarities.
  • The asymmetry originates from the transistor's asymmetric Bloch band dispersion.

Conclusions:

  • The Bloch diode effect is a dual phenomenon to the Josephson diode effect.
  • It can be realized in gate-tunable Cooper pair transistors coupled to a resistive environment.
  • Implementation is suggested using conventional superconducting quantum circuits, such as Josephson junction arrays.