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By Victor Guillemin

This article matches any direction with the be aware "Manifold" within the name. it's a graduate point ebook.

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23) gives px = eEt and determines the periodic dependence of the electron velocity on time [15]: vx = v0 (t) ≡ aε0 cos(ωB t). 26) The frequency ωB = eEa/ is called Bloch frequency. At reasonable values of the electric field, the frequency of the Bloch oscillations of the electron in a metal is many orders of magnitude lower than the collision frequency of the electron even in extremely pure metals (in other words, the oscillation period is much greater than the relaxation time τ in the metal, and the amplitude of the Bloch oscillations is much greater than the electron mean free path).

I. Kaganov [1], where the importance of topology of the Fermi surface for the conductivity was established. Namely, the difference between the “simple” Fermi surface (topological “sphere”) (Fig. 1a) and more complicated surfaces where the nonclosed quasiclassical electron trajectories can arise was shown. In particular, detailed consideration of the “simple” Fermi surface and surfaces like “warped cylinder” (Fig. 1b) for the different directions of B was made. Ya. P. Novikov B B (a) (b) Fig. 1. The “simple” Fermi surface having the form of a sphere in the Brillouin zone and the periodic “warped cylinder” extending through an infinite number of Brillouin zones.

The Brillouin zone in this case plays the role of the space of parameters and R=k. 43) |s = usk (x) exp(ikx), where usk (x) is the periodic in the x-space function and k is the wave vector. Bloch wave (43) and the energy εs (k) are the eigenfunction and the eigenvalue of Eq. 39) at the moment t. The quasiwave vector k is included in this equation as a parameter. For example, in the magnetic field k(t) = k − (e/ c)A(t). 44) supposing that the quasiwave vector in the exponent exp(ikx) is independent of time.

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