Exercises 10.2: Nearly empty band

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10.2.1 The right-hand figure gives a graph of the x-(in blue) and y_(in red) components of the average velocity of the electrons, in a Hall effect experiment. The other is the k-space display at the end of the time shown in the graph. The electric field is horizontal and the magnetic field perpendicular to the screen.

A) What are the directions (i.e., plus or minus) of the electric and the magnetic fields?

B) What is the (omega_c)*(tau) for this system?