Quantized conductance and intersubband scattering in serially connected quantum wires

Abstract

We studied the conductance of quantum wires (QWRs) with rigid confinement potential in different configurations, including single QWRs, QWRs with restricted access to the 2D reservoirs, and serially connected QWRs. We explain the deviations of quantized conductance values from 2e 2 /h as coming from the lack of 1D/2D coupling. The role of intersubband scattering in establishing contact between the QWR and 2D reservoirs is demonstrated. The achievement of conductance step values close to 2e 2 /h in these wires depends on establishing strong intersubband scattering without significant backscattering. c EDP Sciences

Adiabatic Edge Channel Transport in a Nanowire Quantum Point Contact Register

“…The impact of dimensional changeover on conductance quantization is critical. De Picciotto et al , and Dwir et al have investigated a series connection of one-dimensional (1D) quantum wires formed by means of epitaxial overgrowth of the cleaved edge of a high-mobility 2DEG and in a V-groove sample, respectively. There, the 2D–1D scattering length between the two-dimensional contact area and the quantum wire was found to determine the emissivity into the 1D channel.…”