Monte Carlo studies of nonequilibrium phonon effects in polar semiconductors and quantum wells. I. Laser photoexcitation

The effects of optical pump parameters on THz temporal waveforms from large-aperture photoconductive antenna

“…The number of injected particles is determined using an empirical model for the generation rate [7] GðtÞ ¼ I 0 cosh 2:634t…”

The generation rate of optical phonons in quantum cascade lasers under different applied field

“…It has also been making dramatic progress in high device performance at room temperature (300 K) [2,3]. As a complex quantum system, QCL can be modeled in various ways such as the rate equation model [4,5], Monte-Carlo (MC) simulation [6][7][8][9], and the nonequilibrium Green's function with the density matrix model [10,11]. The rate equation method in the design of mid-infrared QCLs cannot take fully into account of the complexity of temperature and density which mainly depend on the scattering time.…”

Quantum Cascade Lasers: Electrothermal Simulation

“…According to the uncertainty principle, position and momentum cannot both be determined simultaneously. Since our electrons are all confined in the central stage (∆z is finite), the cross-plane momentum is not exactly conserved during the scattering process (q z = k z − k z ) [60]. This analysis does not affect the momentum conservation in the x − y plane, because we assume infinite uncertainty in position there.…”

“…This analysis does not affect the momentum conservation in the x − y plane, because we assume infinite uncertainty in position there. Previously, the cross-plane momentum conservation has been considered through the momentum-conservation approximation (MCA) [61,62] and a broadening of q z according to the well width [60]. The MCA forbids a phonon emitted between subbands i and f to be re-absorbed by another transition between i and f if i = i or f = f , and thus might underestimate the electron-LO interaction strength [54].…”