Operation of a semiconductor superlattice oscillator

Transport in semiconductor nanowire superlattices described by coupled quantum mechanical and kinetic models

“…Our results are comparable to those obtained by Schomburg et al [37] using a simpler drift-diffusion model for SSL with an infinite cross section. However, when predicting the frequency of a similar superlattice with a 140 meV miniband width [4], our model for a SSL with infinite cross section predicts a frequency of 68 GHz, which is much closer to observations (70 GHz) than the estimation (∼125 GHz) found using the linear interpolation in figure 4 of [37].…”

“…Semiconductor superlattices (SSLs) can be produced by various techniques, among which sputtering and molecularbeam epitaxy remain the most common. Applications of SSLs include, but are not limited to, various nanolasers [1,2], frequency generators and detectors [3][4][5], thermoelectricsbased nanostructures [6,7], as well as a wide range of different optoelectronic devices [8][9][10].…”

Bifurcation phenomena in a semiconductor superlattice subject to a tilted magnetic field

“…Some questions of the influence of external resonance circuit on charge domains dynamics in superlattice has been considered in Refs. [12,21,10,25].…”

“…With this, Ref. [12] has reported on the detailed experimental study indicating that the current oscillations in superlattices are most likely occurring in the pure charge accumulation mode. Recently, it has 15 been found out that a tilted magnetic field applied to a SSL can strongly affect the electron drift velocity in this nanostructure [13,14] and, correspondingly, the dynamics of the SL in regime of charge domains propagation [15,16].…”

Optimizing biased semiconductor superlattices for terahertz amplification

“…13 For many years, researchers have postulated that biased semiconductor superlattices (BSSL) could be used as compact, tunable THz sources through stimulated emission between Wannier-Stark ladder (WSL) states. [14][15][16][17][18][19] When an electric field F o is applied to a superlattice with period d, the electron and hole minibands are destroyed and replaced by the WSL states, which are localized about the different superlattice sites and have energies given by E n ¼ E 0 þ n hx B , where n is an integer and x B ¼ eFd= h is the Bloch oscillation frequency. 20 Because the WSL states are equally spaced in energy and the transition dipoles between neighboring states are all equal, it has been shown that one cannot achieve THz gain using the non-interacting electron WSL states.…”