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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...
Magnetic Fields01:27

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
Magnetic Field Of A Current Loop01:16

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.
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
Induced Electric Fields01:23

Induced Electric Fields

The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Ring Current and Local Magnetic Fields Influenced by Quantum Interference in Molecular Junctions.

Yun-Long Ge1, Bing-Xin Liu1, Zhao-Ge Jia1

  • 1School of Physics and Optoelectronics, Shandong Normal University, Jinan 250358, China.

The Journal of Physical Chemistry Letters
|May 12, 2026
PubMed
Summary
This summary is machine-generated.

Generating controllable localized magnetic fields (LMFs) at the nanoscale is difficult. This study shows that specific molecular junctions with cyclic segments can create significant ring currents and LMFs via quantum interference effects.

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Area of Science:

  • Condensed matter physics
  • Molecular electronics
  • Quantum chemistry

Background:

  • Controllable localized magnetic fields (LMFs) at the sub-nanometer scale are essential for nanoscale spin filters and logic gates.
  • Understanding quantum interference (QI) effects in molecular junctions is key to manipulating electron transport.

Purpose of the Study:

  • To investigate the generation of controllable LMFs in molecular junctions.
  • To explore the role of quantum interference (QI) in cross and linear π-conjugated systems.
  • To analyze the impact of QI on ring currents and LMFs.

Main Methods:

  • Density Functional Theory (DFT)
  • Non-equilibrium Green's function (NEGF) method
  • Computational modeling of molecular junctions

Main Results:

  • Molecular junctions with cyclic segments containing both cross and linear π-conjugated units can generate controllable nanoscale LMFs (>6 mT).
  • Destructive QI effects in cross-conjugated branches induce pathway selection, leading to significant ring currents and LMFs.
  • Enhancing the planarity of cyclic structures effectively boosts ring currents and LMFs.

Conclusions:

  • Quantum interference in specifically designed molecular junctions offers a pathway to generate controllable localized magnetic fields.
  • The interplay between π-conjugated structures and QI is crucial for nanoscale electronic device design.
  • Molecular junction engineering, particularly planarity, can optimize magnetic field generation for spintronic applications.