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Unformatted text preview: 1 Theory of Solids HW2 Solution By Qifeng Shan Ashcroft and Mermin’s book 14 Helicon Waves Suppose that a metal is placed in a uniform magnetic field H along the zaxis. Let an AC electric field E e i ω t be applied perpendicular to H . (a) If the electric field is circularly polarized ( E y = ± i E x ) show that Eq. (1.28) must be generalized to , , 1 z x y x c x j j i j E i j (1.61) (b) Show that, in conjunction with (1.61), Maxwell’s equations (1.31) have a solution , , z x y t kz i x E E i E e E E , (1.62) provided that k 2 c 2 = ε ω 2 , where / 1 1 2 i c p (1.63) (c) Sketch ε ( ω ) for ω > 0 (choosing the polarization E y = i E x ) and demonstrate that solutions to k 2 c 2 = ε ω 2 exist for arbitrary k at frequencies ω > ω p and ω < ω c . (Assume the high field condition ω c τ >> 1, and note that even for hundreds of kilogauss, ω p / ω c >> 1.) (d) Show that when ω << ω c the relation between k and ω for the low frequency solution is...
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This note was uploaded on 10/04/2011 for the course PHYS 4720 taught by Professor Shan during the Fall '09 term at Rensselaer Polytechnic Institute.
 Fall '09
 Shan
 Solid State Physics

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