Magnetic field effect on tunnel ionization of deep impurities by far-infrared radiation

The probability of electron tunneling from a bound to a free state in an al ternating electric and a constant magnetic field is calculated in the quasi classical approximation. It is shown that the magnetic field reduces the pr obability of electron tunneling. The application of the external magnetic f ield perpendicular to the electric field reduces the ionization probability at high magnetic fields, when cyclotron resonance frequency becomes larger than reciprocal tunneling time. The increase of electric field frequency t o values larger than the same reciprocal tunneling time enhances the influe nce of magnetic field. (C) 1999 Elsevier Science B.V. All rights reserved.