Ganichev, Sergey and Yassievich, Irina and Prettl, Wilhelm (1997) Ionization of deep impurities by far-infrared radiation. Physics of the Solid State 39 (11), pp. 1703-1726.
Other URL: http://www.physik.uni-regensburg.de/forschung/ganichev/reprints/PhysSolState1997p1703_review_tunnel.pdf, http://www.springerlink.com/content/33r70jk3011k7520/?p=0b1913ee77d3436c979f25011ba72aac&pi=0
An analysis is made of the ionization of deep impurity centers by high-intensity far-infrared and submillimeter-wavelength radiation, with photon energies tens of times lower than the impurity ionization energy. Within a broad range of intensities and wavelengths, terahertz electric
fields of the exciting radiation act as a dc field. Under these conditions, deep-center ionization can be described as multiphonon-assisted tunneling, in which carrier emission is accompanied by defect tunneling in configuration space and electron tunneling in the electric field. The field dependence of the ionization probability permits one to determine the defect tunneling times and the character of the defect adiabatic potentials. The ionization probability deviates from the field dependence e(E)}exp(E2/Ec 2) (where E is the wave field, and Ec
is a characteristic field) corresponding to multiphonon-assisted tunneling ionization in relatively low fields, where the defects are ionized through the Poole–Frenkel effect, and in very strong fields, where the ionization is produced by direct tunneling without thermal activation.
The effects resulting from the high radiation frequency are considered and it is shown that, at low temperatures, they become dominant. [brace not closed]
|Institutions:||Physics > Institute of Experimental and Applied Physics > Professor Ganichev > Group Sergey Ganichev|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||05 Oct 2007|
|Last Modified:||20 Jul 2011 21:09|