Analysis of Electron Orbits in Magnetic Fields: Bravais Lattice

In summary, the discussion revolved around the behavior of electrons in a crystal under a magnetic field and the use of the semiclassical equation of motion and band structure for a Bravais lattice to derive conserved quantities. The suggestion was made to start with a simple cubic lattice or a 2D problem with a square lattice and a perpendicular magnetic field, with the reminder that magnetic fields do not do work.
  • #1
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Homework Statement



IF we consider electrons in a crystal subject to a magnetic field. The electrons near the fermi energy wil obey open or closed orbits.
Using semiclassical eqn of motion and band structure for a bravais lattice, discuss the behavour and derive all conserved quantities.

Homework Equations


hbar * dk/dt = -q(1/c * v x B )



The Attempt at a Solution


I have no idea which bravais lattice would be ideal for this problem.
 
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  • #2
Try the simplest possible: a cubic one. Actually, you might like to try a 2D problem first, with a square lattice, and the magnetic field perpendicular to the plane. Further hint: magnetic fields do no work.
 

1. What is the purpose of analyzing electron orbits in magnetic fields on a Bravais lattice?

The purpose of this analysis is to understand the behavior of electrons in a magnetic field on a Bravais lattice, which is a 3-dimensional arrangement of atoms or ions in a crystal structure. This can provide insights into the electronic properties of materials, such as their conductivity, magnetic susceptibility, and energy band structure.

2. How does a magnetic field affect electron orbits on a Bravais lattice?

A magnetic field can cause electrons to experience a force perpendicular to their motion, resulting in a circular or helical orbit. On a Bravais lattice, the periodic arrangement of atoms can influence the shape and energy of these orbits, leading to unique electronic properties.

3. What is the significance of the Bravais lattice in this analysis?

The Bravais lattice is significant because it provides a mathematical framework for describing the periodicity and symmetry of a crystal structure. This is essential for understanding how the arrangement of atoms affects the behavior of electrons in a magnetic field, and ultimately, the properties of the material.

4. Can this analysis be applied to any material or crystal structure?

Yes, this analysis can be applied to any material or crystal structure that can be described by a Bravais lattice. This includes metals, semiconductors, and insulators, as well as different crystal systems, such as cubic, hexagonal, or tetragonal.

5. How is this analysis relevant to real-world applications?

Understanding the behavior of electrons in magnetic fields on a Bravais lattice has many practical applications. For example, it can help in the design of electronic devices, such as transistors and computer chips. It is also crucial in the development of new materials with specific electronic properties, such as those used in renewable energy technologies.

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