Effective mass, Electrical Engineering

Effective Mass

  • The electrons' "wave-particle" motion in a lattice is not the same as that for a free electron, because of the interaction with the periodic potential of the lattice.
  • To still be able to treat these particles as "free", the rest mass has to be altered to take into account the influence of the lattice.
  • The calculation of effective mass takes into account the shape of the energy bands in three-dimensional (3D) k-space, taking appropriate averages over the various energy bands.
  • The effective mass of an electron in a band with a given (E,k) relation is given by

 

                               Mx = [h/(2π)]2 / d2E/dk2         

Posted Date: 1/11/2013 4:32:12 AM | Location : United States







Related Discussions:- Effective mass, Assignment Help, Ask Question on Effective mass, Get Answer, Expert's Help, Effective mass Discussions

Write discussion on Effective mass
Your posts are moderated
Related Questions
A 20µF capacitor is connected in series with a 50 kΩ resistor and the circuit is connected to a 20 V, d.c. supply. Verify: a)  The initial value of the current flowing, b)  T

Explain Nodal analysis (supernode)

how to calculate voltage when 3 voltage sources are given?

Q. For an RG-290/U aluminum rectangular wave - guide, a = 58.42 cm and b = 29.21 cm. Compute the theoretical and practical frequency ranges of operation for the guide.

Q. A 100-kW, 230-V, dc shunt generator, with R a = 0.05 , and R f = 57.5  has no-load rotational loss (friction, windage, and core loss) of 1.8 kW. Compute: (a) The generato

Electric flux density (D): Electric flux density is a measurement of electric flux that pass through a unit of plate's area with a coincide angle, that is an area of 1 meter 2

Ferroelectric materials are characterised by (A) Very high degree of polarisation. (B) A sharp dependence of polarisation on temperature. (C) Non-linear dependence o

Preventive and Regular Maintenance Preventive and regular manages of components of the distributions system is necessary to reduce/eliminate breakdowns. Care should be taken t


2. A 6 pole lap-wound armature having 720 conductors, rotates in a field of 20.35 mWb. (a) If the induced current is 72 A, what is the torque developed by armature? (b) If the indu