Tuning of coupling modes in laterally parallel double open quantum dots

Abstract

We consider electronic transport through laterally parallel double open quantum dots embedded in a quantum wire in a perpendicular magnetic field. The coupling modes of the dots are tunable by adjusting the strength of a central barrier and the applied magnetic field. Probability density and electron current density are calculated to demonstrate transport effects including magnetic blocking, magnetic turbulence, and a hole-like quasibound state feature. Fano to dip line-shape crossover in the conductance is found by varying the magnetic field.

Time-dependent magnetotransport of a wave packet in a quantum wire with embedded quantum dots

“…35 Our previous work has devoted effort in developing numerical computation of magnetotransport in a transversely hill-separated parallel double open quantum dot system with strong coupling to the leads. 36 It is thus appropriate to analyze the propagation behavior of the electron wave packet in a quantum wire with an embedded parallel double open quantum dot to get better insight into the dynamical properties.…”

Site-dependent doping effects on quantum transport in zigzag graphene nanoribbons

“…A single impurity in quantum confined open systems can yield quasibound states below the subband bottoms which strongly backscatter the conduction electron at specific energy and reduce the quantized conductance [7][8][9][10]. Doping of GNRs to influence the electronic properties is an important aspect in GNR-based devices that can be achieved through techniques such as low energy ion implantation [11,12].…”

“…We explicitly examine the site-dependent doping effects on quantum transport in hydrogenated ZGNRs with a single B or N dopant located near their edges. The Coulomb interaction is taken into account to reexamine the quasibound state feature beyond the single-particle picture based on transverse invariance breaking [7][8][9]. Whereas the magnetic interaction strength in our sample is estimated to be less than 5 meV [20] or around 25 meV [21], we assume that the spin of conduction electrons is doubly degenerate [1] This article is organized as follows.…”

Time-dependent magnetotransport in an interacting double quantum wire with window coupling

“…Quantum interference phenomena are essential when developing mesoscale electronic devices. Quantum confined geometries conceived for such studies may consist of two-path interferometers, 1,2 parallel quantum dots, 3 coupled quantum wires, 4 side-coupled quantum dots, 5,6 or Rashba double dots in a ring. 7 These coupled mesoscopic systems have captured recent interest due to their potential applications in electronic spectroscopy tools 8 and quantum information processing.…”