The kinetic energy of the electrons outside the FBZ

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SUMMARY

The discussion focuses on the kinetic energy of electrons in solid state physics, specifically addressing the relationship between energy states within and outside the First Brillouin Zone (FBZ). It establishes that while the kinetic energy of electrons is defined by the equation $$E_{k}=\frac{\hbar^2k^2}{2m}$$, electrons in different states (inside and outside the FBZ) exhibit different kinetic energies but maintain the same total energy (E). The inquiry into the role of potential energy and band index in this context is also highlighted.

PREREQUISITES
  • Understanding of solid state physics principles
  • Familiarity with the concept of the First Brillouin Zone (FBZ)
  • Knowledge of kinetic energy equations in quantum mechanics
  • Basic grasp of reciprocal lattice vectors
NEXT STEPS
  • Study the implications of the First Brillouin Zone on electron behavior
  • Explore the concept of band theory in solid state physics
  • Investigate the role of potential energy in electron states
  • Learn about the significance of band indices in electronic properties
USEFUL FOR

Students and researchers in solid state physics, particularly those studying electron dynamics and energy states in crystalline materials.

HenryWhu
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Homework Statement


In solid state physics,we know all the states of free electrons can be expressed by the First Brillouin Zone. We know the $$E(k+K)=E(k)$$ where K is reciprocal lattice vector. We also know that the kinetic energy of the electron is $$E_{k}=\frac{\hbar^2k^2}{2m}$$. [/B]

Homework Equations


For electrons in the FBZ and out of the FBZ, they have different $$E_{k}$$ but same $$E$$
why?[/B]

The Attempt at a Solution


it is because they have different potential energy?[/B]
 
Physics news on Phys.org
How about the band index?
 

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