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2023-06-22
Research highlights

Quantized Spin Pumping in Topological Ferromagnetic-Superconducting Nanowires

Physical Review Letters 130, 237002 (2023)

(a) Sketch of the device. Rashba nanowire (green) with proximity induced superconductivity (blue) and magnetization (gray) supporting a Majorana zero mode (red). (b) Topological phase diagram of the device as a function of m0 and θ. (c),(d) The pumped charge Q and spin Sz as a function of m0 for different tunneling barriers. The pumped spin is quantized to Sz = ℏ/2 in the topologically nontrivial regime.

Semiconducting nanowires with strong spin-orbit coupling in the presence of induced superconductivity and ferromagnetism can support Majorana zero modes (MZMs). The long-term goal is the demonstration of the non-abelian Majorana braiding statistics that would enable the realization of a topological quantum computer. So far the majority of experiments has focused on the zero-bias peaks in the conductance but there exists an abundance of mechanisms that can lead to non-Majorana zero-bias conductance peaks. In the article published in Physical Review Letters the researchers from MagTop, Aalto University and Tampere University predict that the precession of the magnetization leads to robust quantized spin pumping in topologically nontrivial nanowires supporting MZMs. Moreover, they find that there exists one-to-one correspondence between the quantized conductance, entropy change and spin pumping in topologically nontrivial nanowires but these observables are uncorrelated in the case of non-Majorana excitations. Based on this finding, they propose that the correlated observation of these quantized effects would provide strong evidence of MZMs, providing a possible solution to the important long-standing problem in the field of topological superconductivity.


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https://pubs.rsc.org/en/content/articlelanding/2023/cp/d3cp01666h

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