Several experiments in nanowires detected signatures of Majorana fermions, building block for topologicaly protected quantum computer. Now the focus of research is shifting toward systems where non-Abelian statistics of excitations can be demonstrated. To achieve this goal we are developing a new dilute magnetic semiconductor-based platform where non-Abelian excitations can be created and manipulated in a two-dimensional plane, with support for Majorana and higher order non-Abelian excitations. Here we report development of heterostructures where spin polarization of a two-dimensional electron gas in a quantum Hall regime can be controlled locally by electrostatic gating. This is demonstrated via voltage induced shift of quantum Hall ferromagnetic transition in the CdTe quantum wells with engineered placement of paramagnetic Mn impurities. The structures can be used to form helical domain walls in integer quantum Hall regime which, coupled to an s-wave superconductor, are expected to support Majorana zero modes. These heterostructures can be used as a testbed to study gate-reconfigurable domain walls networks.
Leonid Rokhinson, Aleksandr Kazakov, George Simion, Yuli Lyanda-Geller, Valery Kolkovsky, Grzegorz Karczewski, Zbigniew Adamus, and Tomasz Wojtowicz, "Gate control of spin polarization in a quantum Hall regime toward reconfigurable network of helical channels
(Conference Presentation)," Proc. SPIE 9931, Spintronics IX, 993139 (Presented at SPIE Nanoscience + Engineering: August 31, 2016; Published: 4 November 2016); https://doi.org/10.1117/12.2238263.5167075281001.
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