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The Physics of Low-dimensional Semiconductors by John H. Davies

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ELECTRIC ANDMAGNETIC FIELDS

Electric and magnetic fields are among the most valuable probes of an electronic system. An obvious use of an electric field is to drive a current through a conductor; we studied conduction due to tunnelling in the previous chapter and will consider the opposite case of freely propagating electrons weakly scattered by impurities or phonons in later chapters. It is more surprising that useful information or practical applications can be obtained by applying an electric field to an insulator. An example of this is a change in optical absorption near a band edge caused by a strong electric field, the Franz–Keldysh effect, ...

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