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Related Concept Videos

Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

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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...
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Magnetic Moment of an Electron01:23

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Electrons revolving around a nucleus are analogous to a circular current carrying loop. This current produces a magnetic dipole moment proportional to the electron's orbital angular momentum. Since the orbital angular momentum is quantized in terms of the reduced Planck's constant, the dipole moment is quantized in the Bohr Magneton. The value of the Bohr magneton is 9.27 x 10-24 Am2. Electrons also have an intrinsic spin angular momentum, and the associated spin magnetic moment is...
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Motion Of A Charged Particle In A Magnetic Field01:22

Motion Of A Charged Particle In A Magnetic Field

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A charged particle experiences a force when moving through a magnetic field. Consider the field to be uniform and the charged particle to move perpendicular to it. If the field is in a vacuum, the magnetic field is the dominant factor determining the motion. Since the magnetic force is perpendicular to the direction of motion, a charged particle follows a curved path. The particle continues to follow this curved path until it forms a complete circle. Another way to look at this is that the...
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Magnetic Fields01:27

Magnetic Fields

6.5K
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...
6.5K
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

1.3K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Electric Field of a Charged Disk01:23

Electric Field of a Charged Disk

2.8K
The simplest case of a surface charge distribution is the uniformly charged disk. Calculating its electric field also helps us calculate the electric field of a large plane of charge.
The system's symmetry is in the cylindrical directions across the plane of the charge. As a result, the electric fields created by various surface charge elements nullify each other in the direction parallel to the surface. Thereby, the resulting electric field is perpendicular to the plane. Since the disk is...
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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Magnetic-Field-Driven Electron Dynamics in Graphene.

Fatima1,2, Talgat Inerbaev3,4, Wenjie Xia1

  • 1Department of Civil and Environmental Engineering, North Dakota State University, Fargo, North Dakota 58108, United States.

The Journal of Physical Chemistry Letters
|May 13, 2021
PubMed
Summary
This summary is machine-generated.

Computational modeling reveals that magnetic fields alter electron dynamics in graphene, causing deviations from momentum conservation and cyclotron-like trajectories. This deepens understanding of graphene

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Quantum mechanics

Background:

  • Graphene possesses unique optoelectronic properties due to its Dirac point band structure.
  • Graphene serves as a model system for studying electronic and optical properties under external fields.
  • Electron dynamics in graphene are influenced by momentum dispersion, electric fields, and laser pulses.

Purpose of the Study:

  • To perform computational modeling of photoexcited electron dynamics in graphene under an applied magnetic field.
  • To investigate the influence of magnetic fields on momentum-resolved electron dynamics in graphene.
  • To understand the non-equilibrium properties of graphene for optoelectronic and photovoltaic applications.

Main Methods:

  • Computational modeling of photoexcited electron dynamics.
  • Simulation of electron behavior in graphene under applied magnetic fields.
  • Analysis of momentum-influenced electron dynamics.

Main Results:

  • Applied magnetic fields cause local deviations from momentum conservation for charge carriers in graphene.
  • Increasing magnetic field strength leads to increased delocalization of electron probability distribution.
  • Electrons form cyclotron-like trajectories under the influence of magnetic fields.

Conclusions:

  • Magnetic fields significantly impact electron dynamics and momentum conservation in graphene.
  • The observed delocalization and cyclotron trajectories are crucial for understanding graphene's optoelectronic behavior.
  • This research provides critical insights for advancing optoelectronic and photovoltaic device applications using graphene.