Magneto-Optics of Shallow Donors in Small-Gap Semiconductors
The following lectures are concerned with magneto-optical properties of shallow donors in InSb-type small-gap semiconductors. Binding energy of impurities in small-gap materials is usually so small that in absence of external fields one deals almost always with ionized donors. However, an application of a magnetic field increases the binding energy allowing one observe bound donor states, thus opening new possibilities for far infrared spectroscopy. The increase of binding energy is also known in magnetoresistance as a magnetic freeze-out of conduction electrons into bound states. The problem has more general physical significance, imitating the free hydrogen atan in the presence of an extremely high magnetic field.
KeywordsMagnetic Field Selection Rule High Magnetic Field Donor State Trial Function
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