Abstract
We propose an accurate clocked single-spin source for ac-spintronic applications. Our device consists of a superconducting island covered by a ferromagnetic insulator (FI) layer through which it is coupled to superconducting leads. Single-particle transfer relies on the energy gaps and the island's charging energy, and is enabled by a bias and a time-periodic gate voltage. Accurate spin transfer is achieved by the FI layer which polarizes the island, provides spin-selective tunneling barriers and improves the precision by suppressing Andreev reflection. We analyze realistic material combinations and experimental requirements which allow for a clocked spin current in the MHz regime.
Highlights
In recent years single-electron sources in solid-state systems have been successfully implemented [1], based on superconducting turnstiles [2], using time-dependently modulated confined structures with a discrete spectrum [3] as well as dynamical quantum dots, driven by gating [4, 5] or surface-acoustic waves [6, 7]
Single-spin sources with high accuracy are still missing. Their successful implementation offers a realm of opportunities: for instance they could be used to emit in a controlled way single quasiparticles with a defined spin into a superconducting contact; this is of interest for spintronics at the single-particle level [14, 15], for controlled quantum operations (e.g. on flying-qubits), and for the fundamental research on singleparticle characteristics
We have proposed a clocked, accurate source for single spins based on the parity effect in an S island with S contacts operated as a turnstile
Summary
Original content from this work may be used under the terms of the Creative Abstract. We propose an accurate clocked single-spin source for ac-spintronic applications. Any further distribution of of a superconducting island covered by a ferromagnetic insulator (FI) layer through which it is coupled this work must maintain attribution to the to superconducting leads. Single-particle transfer relies on the energy gaps and the islands charging author(s) and the title of energy, and is enabled by a bias and a time-periodic gate voltage. Accurate spin transfer is achieved by the work, journal citation and DOI. The FI layer which polarizes the island, provides spin-selective tunneling barriers and improves the precision by suppressing Andreev reflection. We analyze realistic material combinations and experimental requirements which allow for a clocked spin current in the MHz regime
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