b)The motion vision in the real space The oscillation of the electron velocity means the electron oscillation in real space (coordinate space).Function E(k)represents the electron energy eigenvalues in the periodic field.When external electric field is applied,an electrostatic potential es will be attached, which makes the energy band inclined as shown below. band inclined by the electric field
b) The motion vision in the real space E x =0 E x band inclined by the electric field The oscillation of the electron velocity means the electron oscillation in real space (coordinate space). Function E(k) represents the electron energy eigenvalues in the periodic field. When external electric field is applied, an electrostatic potential will be attached, which makes the energy band inclined as shown below. e
The periodic oscillations of the electron velocity is in real space When t=0,electron is at point A,the band bottom of lower band. In the presence of external field force,electrons move along A->B >C,corresponding from k=0 to k=".The electron meet energy gap (equal to point A)at C point.In the classical movement, electrons are constrained in one energy band,so it will be reflected back.The electron transmit as C->B->A,that is,a oscillation process is completed during the movement from k=-z/a to k=0
A B C When t = 0, electron is at point A, the band bottom of lower band. In the presence of external field force, electrons move along A→B →C, corresponding from k = 0 to . The electron meet energy gap (equal to point A) at C point. In the classical movement, electrons are constrained in one energy band, so it will be reflected back. The electron transmit as C→B→A, that is, a oscillation process is completed during the movement from k= –π/a to k = 0. k a = The periodic oscillations of the electron velocity is in real space