EFFECT OF P(-CONTACT PARAMETERS ON SUBTERAHERTZ AND TERAHERTZ BALLISTIC CURRENT OSCILLATIONS FOR QUANTIZED HOLES WITH NEGATIVE EFFECTIVE MASSES())

A space-charge limited ballistic current of quantized holes in a short doped p-GaAs quantum well generates current oscillations. This genera tion is a result of a negative effective mass region in the hole dispe rsion relation. An oscillation frequency depends on the parameters of the diode structure with quantum well as a base, and is in subterahert z and terahertz ranges. It is determined by a longitudinal mode of a s elftuning plasma cavity in the diode base which depends on a Fermi ene rgy of holes emitted by the pc-anode and cathode into the base. The be st oscillation generation regime is achieved at some optimum value of the Fermi energy. (C) 1998 Elsevier Science B.V. All rights reserved.