David K. Ferry

TL;DR: In this paper, a self-consistent potential was proposed to solve a selfconsistent charge selfconsistency problem, which obviates the need to parametrize the voltage.

TL;DR: In this article, the conductance through a smooth potential barrier in a narrow quantum wire is shown to be quantized, and it is shown that there are two essential elements for such conductance quantizations in the ballistic regime: a quantized energy spectrum and a nearly-classical transmission or reflection through the potential barrier.

Abstract: The use of femtosecond laser pulses to excite plasmas in semiconductors has become a major method of studying fast processes.1 The transition times from the Γ valley to the satellite X and L valleys are comparable to the reciprocal of the frequency of the phonons involved, bringing into question the use of standard perturbation-theory approaches. Our aim is to evaluate the time required to emit a phonon, either the intravalley LO or the intervalley, by a nearly-free electron in semiconductors. The leading idea of our work is that the so-called “collision duration” is related to the time required to build up correlation between the initial and final state, and then to destroy this correlation as the collision is completed. The calculations are developed using a non-equilibrium Green’s function formalism, which allows us to evaluate explicitly the effects of the correlations in time.

TL;DR: In this paper, the authors carried out Joule heating measurements on three etched quantum wires (QWRs) of various widths and 2D electron gases (2DEGs) over temperatures ranging from 0.035 K to 20 K.