What is it about?
the title says is all. Going beyond first order: what difference does it make? Turns out quite a lot.......
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Why is it important?
Designing light emitting diodes or piezoelectric cantilever systems or MEMS/NEMS, without second order could lead to severe errors.
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This page is a summary of: A review of non linear piezoelectricity in semiconductors, January 2014, American Institute of Physics,
DOI: 10.1063/1.4870192.
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