Modified Space Charge Waves in Magnetized Semiconductor Quantum Plasmas

摘要

abstract_textpA dispersion relation of space charge wave is derived using one dimensional quantum hydrodynamic model in semiconductor plasma subjected to d.c. electric and magneto-static fields. It is studied analytically for both classical and quantum plasma systems. Here the carrier drift due to d.c. electric field acts as source of free energy in the system and may be attributed as cause for unstable space charge mode. It is found that the quantum parameter-H and the orientation of applied magnetic field together not only play a key role in the dynamics of space charge wave but also induce four new channels of propagation. The phase speed and growth rate of all modes are found to be very sensitive to the orientation of the magnetic field./p/abstract_text