A mesoscopic Tera-hertz pulse detector

We show that, under the passage of an electromagnetic terahertz pulse, an asymmetric double barrier device may act as an on/off current switch, depending on the bias. The time-dependent response of the device is discussed.Comment: 3 pages Revtex, 4 PS figures. To appear in Applied Physics Letter

Non-Linear Effects in Resonant Tunneling; Bistabilities and Self-Sustained Oscillating Currents

We study non-linear phenomena in double barrier heterostructures. Systems in 3D under the effect of an external magnetic field along the current and 1D systems are analyzed. Non-linearities are reflected in the I-V characteristic curve as bistabilities, instabilities and time dependent oscillations of the currents. The nature of the non-linear behavior depends upon the parameters that define the system.Comment: 3 pages, 2 figures, accepted for publication in Superlattices and Microstructure