Magnetic forces and stationary electron flow in three-terminal semiconductor quantum ring - Condensed Matter > Mesoscale and Nanoscale PhysicsReportar como inadecuado




Magnetic forces and stationary electron flow in three-terminal semiconductor quantum ring - Condensed Matter > Mesoscale and Nanoscale Physics - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: We study stationary electron flow through a three-terminal quantum ring anddescribe effects due to deflection of electron trajectories by classicalmagnetic forces. We demonstrate that generally at high magnetic field $B$ thecurrent is guided by magnetic forces to follow a classical path which for $B>0$leads via the left arm of the ring to the left output terminal. The transportto the left output terminal is blocked for narrow windows of magnetic field forwhich the interference within the ring leads to formation of wave functionsthat are only weakly coupled to the output channel wave functions. Theseinterference conditions are accompanied by injection of the current to theright arm of the ring and by appearance of sharp peaks of the transferprobability to the right output terminal. We find that these peaks at highmagnetic field are attenuated by thermal widening of the transport window. Wealso demonstrate that the interference conditions that lead to their appearancevanish when an elastic scattering within the ring is present. The clear effectof magnetic forces on the transfer probabilities disappears along withAharonov-Bohm oscillations in a chaotic transport regime that is found forrings whose width is larger than the width of the channels.



Autor: M.R. Poniedzialek, B. Szafran

Fuente: https://arxiv.org/







Documentos relacionados