Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Oscillations In An LC Circuit

Oscillations In An LC Circuit

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

Electrical Current

Electrical Current

Electrical current is defined as the rate at which charge flows. When there is a large current present, such as that used to run a refrigerator, a large amount of charge moves through the wire in a small amount of time. If the current is small, such as that used to operate a handheld calculator, a small amount of charge moves through the circuit over a long period of time. The SI unit for current is the ampere (A), named for the French physicist André-Marie Ampère (1775–1836). An ampere is the...

Magnetic Field Of A Current Loop

Magnetic Field Of A Current Loop

Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.

Continuous Charge Distributions

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...

Series R—L Circuit Transients

Series R—L Circuit Transients

In a series resistor-inductor (R-L) circuit, closing the switch at the start of the time period simulates a three-phase short circuit, a fault condition where all three phases of an unloaded synchronous machine are short-circuited. When there is no fault impedance and no initial current, the initial voltage is determined by the phase angle of the source voltage.
Using Kirchhoff's Voltage Law (KVL) to analyze this circuit helps determine the total asymmetrical fault current, which consists of...

Significance of Displacement Current

Significance of Displacement Current

A displacement current is analogous to a real current in Ampère's law, participating in Ampère's law the same way as the usual conduction current. However, it is produced by a changing electric field. Displacement current is defined in terms of a time-varying electric field, and also has an associated displacement current density. By adding a term accounting for displacement current, Maxwell modified the existing Ampère's law, which is now called generalized Ampère's law.

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Neutral Endopeptidase (Neprilysin) in Therapy and Diagnostics: Yin and Yang.

Biochemistry. Biokhimiia·2019

Same author

[Cytogenetic aberrations in peripheral blood mononuclear cells in acute Lyme-borreliosis patients].

TSitologiia i genetika·2013

Same author

Magnetic field and contact resistance dependence of non-local charge imbalance.

Nanotechnology·2010

Same author

[Therapeutic effect of mineral water of the Belokurikha spa resort on the level of antinuclear antibodies and chromosomal aberrations in synovial cells of patients with osteoarthrosis].

Voprosy kurortologii, fizioterapii, i lechebnoi fizicheskoi kultury·2009

Same author

[Portable personal staircase elevator Vektor].

Meditsinskaia tekhnika·2007

Same author

[An electric exercycle for rehabilitation of patients with movement disorders].

Meditsinskaia tekhnika·2007

Search research articles

Related Experiment Video

Updated: Jun 3, 2026

Measurement of Ion Concentration in the Unstirred Boundary Layer with Open Patch-Clamp Pipette: Implications in Control of Ion Channels by Fluid Flow

Measurement of Ion Concentration in the Unstirred Boundary Layer with Open Patch-Clamp Pipette: Implications in Control of Ion Channels by Fluid Flow

Published on: January 7, 2019

Fluctuations of persistent current.

A G Semenov¹, A D Zaikin

¹I E Tamm Department of Theoretical Physics, P N Lebedev Physics Institute, Moscow, Russia. semenov@lpi.ru

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|March 17, 2011

Summary

This summary is machine-generated.

Persistent current (PC) fluctuations in nanorings continue to zero temperature if the current operator and system Hamiltonian do not commute. PC noise spectrum reveals quantum coherence and can be tuned by magnetic flux.

More Related Videos

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition

Published on: June 27, 2025

Contribution of the Na+/K+ Pump to Rhythmic Bursting, Explored with Modeling and Dynamic Clamp Analyses

Contribution of the Na⁺/K⁺ Pump to Rhythmic Bursting, Explored with Modeling and Dynamic Clamp Analyses

Published on: May 9, 2021

Related Experiment Videos

Last Updated: Jun 3, 2026

Measurement of Ion Concentration in the Unstirred Boundary Layer with Open Patch-Clamp Pipette: Implications in Control of Ion Channels by Fluid Flow

Measurement of Ion Concentration in the Unstirred Boundary Layer with Open Patch-Clamp Pipette: Implications in Control of Ion Channels by Fluid Flow

Published on: January 7, 2019

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition

Published on: June 27, 2025

Contribution of the Na+/K+ Pump to Rhythmic Bursting, Explored with Modeling and Dynamic Clamp Analyses

Contribution of the Na⁺/K⁺ Pump to Rhythmic Bursting, Explored with Modeling and Dynamic Clamp Analyses

Published on: May 9, 2021

Area of Science:

Condensed Matter Physics
Quantum Mechanics
Nanotechnology

Background:

Persistent currents (PCs) are theoretically significant in mesoscopic systems.
Understanding equilibrium fluctuations of PCs is crucial for quantum device applications.

Purpose of the Study:

To theoretically analyze equilibrium fluctuations of persistent current (PC) in nanorings.
To investigate the temperature dependence of PC fluctuations and their noise spectrum.

Main Methods:

Theoretical analysis of equilibrium fluctuations.
Evaluation of PC noise power for a quantum particle on a ring model.
Consideration of systems with multiple conducting channels.

Main Results:

PC fluctuations persist down to zero temperature under specific quantum conditions.
PC noise power exhibits sharp peaks at frequencies related to interlevel distances.
Rings with multiple channels show smoother, broader noise spectra.
PC noise spectrum is tunable by external magnetic flux, indicating quantum coherence.

Conclusions:

Quantum coherence plays a vital role in persistent current fluctuations.
PC noise serves as a sensitive probe for quantum effects in nanorings.
Tunability of PC noise by magnetic flux offers potential for quantum information applications.