Influence Of Rashba Spin-orbit Coupling On Fano-kondo Effect

Fano effect arising from the quantum interference between resonant and nonresonant processes, have been observed in lots of physical fields, including neutron scattering, atomic photoionization, Raman scattering, optical absorption in quantum wells, scanning tunneling microscopy, and microwave scattering. The sign of Fano effect is the asymmetric lineshapes in the spectra concerned. Fano effect in the mesoscopic structure of quantum dots in the electron transport is also a kind of common phenomenon. As is known, the coupled multiple QD structures provide multiple channels for electronic coherent transmission. In appropriate parameter region, one or a few channels serve as the resonant paths for electron tunneling and the others are the nonresonant ones. Quantum interference of electron waves going through these different paths inevitably leads to the occurrence of Fano effect in these structures.Experimentally, Fano resonances have been observed first in QD electronic transport at the Kondo regime. More recently, by embedding a Coulomb blockaded QD in an Aharonov-Bohm ring interferometer, a variety of Fano lineshapes were observed in the measured conductance spectra. Researchers in virtue of the conductance spectrum measurement to study the electron transport properties of various geometric configurations，such as a quantum wire with a side-coupled QD, a one-lead QD, a ring with side-coupled QD, as well as the parallel double QD Structures, provide more insight into the Fano problem in mesoscopic systems.This article theoretically studies the Fano effect in the parallel coupling structure of double quantum dots, Model selection of one dot in the Kondo regime and the other one being located in the region of local Rashba interaction. We studied the structure under several physical effect of the electrons in the quantum coherent transport properties. We pay particular attention to the Fano effect under the influence of the Kondo resonance in this system. The research result shows that the Fano interference brings about the quenching of the Kondo resonance, which also becomes dependent on the electron spin by the presence of appropriate local magnetic flux. The analysis showed that the coupling between the Kondo dot coupling to the electron reservoirs offers a reference channel for the electron traveling, whereas the connection of the Rashba dot and the leads affords a resonant channel. Fano effect associated with the adjustment of Rashba field. The Fano interference brings about the quenching of the Kondo resonance, at the same time adjusting the local magnetic flux can make electronic transport depend on the spin.