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Possible oral exam questions about crystal physics
- The thermal expansion coefficient describes how the strain changes as the temperature changes. What rank tensor is the thermal expansion coefficient?
- How can the symmetry of the crystal reduce the number of independent components of a tensor?
- How would you calculate the pyroelectric coefficients from the microscopic quantum states (electron states and phonon states) of the crystal?
- When transistors are made from silicon, usually the [100] direction is perpendicular to the surface. Does it matter if the transistors are made so that the current flows in the [010] direction or the [011] direction? Why or why not?
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