## Introduction to Solid State Physics |

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Page 235

We imagine that the electrons are moving around in a random way, with a

velocity distribution appropriate to a condition of thermal

temperature T. In the absence of an applied electric field the average or drift

velocity, (10.1) ...

We imagine that the electrons are moving around in a random way, with a

velocity distribution appropriate to a condition of thermal

**equilibrium**attemperature T. In the absence of an applied electric field the average or drift

velocity, (10.1) ...

Page 236

or, if vp(0) is the initial drift velocity in the non-

approach to

vo(t) = vo(0)eT". We have thus arranged things so that a disturbance from

or, if vp(0) is the initial drift velocity in the non-

**equilibrium**distribution, theapproach to

**equilibrium**is described by the appropriate solution of (10.3): (10.4)vo(t) = vo(0)eT". We have thus arranged things so that a disturbance from

**equilibrium**...Page 263

(a)

for time r. (c) Difference between steady-state distribution and

distribution. the steady-state distribution, (10.98) P(r,t) = P(v, 0) — (eEr/m) (d.1°/dt,

).

(a)

**Equilibrium**velocity distribution. (b) Distribution shifted by electric field appliedfor time r. (c) Difference between steady-state distribution and

**equilibrium**distribution. the steady-state distribution, (10.98) P(r,t) = P(v, 0) — (eEr/m) (d.1°/dt,

).

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