Spin filtering in a Rashba–Dresselhaus–Aharonov–Bohm double-dot interferometer

Abstract

We study the spin-dependent transport of spin-1/2 electrons through an interferometer made of two elongated quantum dots or quantum nanowires, which are subject to both an Aharonov-Bohm flux and (Rashba and Dresselhaus) spin-orbit interactions. Similar to the diamond interferometer proposed in our previous papers (Aharony et al 2011 Phys. Rev. B 84 035323; Matityahu et al 2013 Phys . Rev. B 87 205438), we show that the double-dot interferometer can serve as a perfect spin filter due to a spin interference effect. By appropriately tuning the external electric and magnetic fields which determine the Aharonov-Casher and Aharonov-Bohm phases, and with some relations between the various hopping amplitudes and site energies, the interferometer blocks electrons with a specific spin polarization, independent of their energy. The blocked polarization and the polarization of the outgoing electrons is 6

Rashba and Dresselhaus Effects in Hybrid Organic–Inorganic Perovskites: From Basics to Devices

“…Contrary to the previous examples, 38,39,[73][74][75][76][77][78][79] the suggested setup presents no manifestation of the SOC in terms of spin 19 splitting (l R = 0 eV.Å) when the electric field is switched off, which makes less delicate the tuning of the source-drain distance and of the amplitude of the transverse field.…”

“…In this manner a perfect spin filter can be achieved. [77][78][79] Figure 6: Scheme of a sFET as proposed by Datta and Das 72 based on hybrid organic-inorganic perovskites with a representation of the spin precession from the source to the drain.…”

Focus on the Rashba effect

“…Spin filters based on a single loop are promising as spin valves or analyzers. Matityahu et al [80] demonstrate theoretically that an interferometer made of two quantum dots or quantum nanowires with strong SO interaction and threaded by an Aharonov-Bohm flux can serve as a perfect spin filter. Under this condition, perfect symmetry between the two branches is not required.…”

Quantum ring with the Rashba spin-orbit interaction in the regime of strong light-matter coupling

“…In turn, this results in the large conductance modulation due to the interference of the spin waves 48 . As a consequence, physical basis of various QR-based non-ferromagnetic spintronic devicesincluding spin transistors, spin filters and quantum splitters -appears [49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64] . In the aforecited previous studies on the subject, the spin properties of QRs were assumed to be controlled by gate voltage.…”