Abstract
Earlier analyses which have predicted submillimeter-wave negative conductance in short GaAs n+nn+ structures are reviewed, and found to be deficient with respect to transport model and boundary conditions employed. The critical sensitivity of the results to boundary conditions is demonstrated analytically. Large-signal results for a specific GaAs n+nn+ structure are then presented. These results, obtained using a self-consistent particle-field Monte Carlo simulation, suggest that the structure may display negative conductance at very low temperatures, but that a room-temperature lattice condition precludes such negative conductance.
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