Regarding Drude theory and AC conductivity of metal

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SUMMARY

The discussion centers on the application of Drude theory in understanding AC conductivity in metals, as referenced in the book "Solid State Physics" by Ashcroft and Mermin. It highlights the use of complex notation to represent fields and momentum, emphasizing that both the real and imaginary parts of complex functions must satisfy the same governing equations. The conversation illustrates how combining real functions, such as cosine and sine, into complex exponentials simplifies the analysis while maintaining the integrity of the solutions. The importance of phase factors in determining the real part of the complex function is also noted.

PREREQUISITES
  • Understanding of Drude theory in solid-state physics
  • Familiarity with complex functions and their properties
  • Knowledge of AC conductivity principles
  • Basic grasp of Fourier analysis and wave functions
NEXT STEPS
  • Study the implications of Drude theory on AC conductivity in metals
  • Explore complex analysis in the context of electromagnetic fields
  • Learn about the role of phase factors in wave function representation
  • Investigate the mathematical derivation of the governing equations in solid-state physics
USEFUL FOR

Physicists, electrical engineers, and students studying solid-state physics who are interested in the theoretical foundations of AC conductivity and the mathematical tools used in the analysis of electromagnetic fields.

otaKu
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This snapshot is from the book Solid State Physics by Ashcroft,Mermin. They represented the Field and Momentum as the real part of a complex function. As far as what I understand, we represent fields in complex notations for our own convenience over the standard real representation which results in computational complexities. Why then does the imaginary part of the field which we have designated by ourselves need to satisfy the equation 1.24 which the real part of the field(the actual field) satisfies?
 
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You combine two real functions into two complex functions, the second one being the adjoint function of the first.E.g you can combine cos x and sin x into exp ix and exp -ix. Hence both the real and the imaginary part of the complex function are solutions of the equation you want to solve. Whether you recover the cos or sin function taking the real part, you can decide by multiplying the complex function with a complex phase factor.
 
Thanks for the input! It was helpful.
 

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