Spin spectroscopy of a hybrid superconducting nanowire using side-coupled quantum dots

Danilenko, Alisa; Pöschl, Andreas; Sabonis, Deividas; Vlachodimitropoulos, Vasileios; Thomas, Candice; Manfra, Michael J.; Marcus, C. M.

doi:10.1103/physrevb.108.054514

Cited by 6 publications

(2 citation statements)

References 45 publications

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“…Furthermore, we show that the complete spin polarization of the ABS is responsible for a transport blockade that can be lifted by coupling the ABS to a non-polarized electron reservoir. We refer readers to a simultaneous submission by Danilenko et al 38 for another report reaching complementary conclusions.…”

Section: Introductionmentioning

confidence: 91%

Spin-filtered measurements of Andreev bound states in semiconductor-superconductor nanowire devices

van Driel,

Wang,

Bordin

et al. 2023

Nat Commun

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Semiconductor nanowires coupled to superconductors can host Andreev bound states with distinct spin and parity, including a spin-zero state with an even number of electrons and a spin-1/2 state with odd-parity. Considering the difference in spin of the even and odd states, spin-filtered measurements can reveal the underlying ground state. To directly measure the spin of single-electron excitations, we probe an Andreev bound state using a spin-polarized quantum dot that acts as a bipolar spin filter, in combination with a non-polarized tunnel junction in a three-terminal circuit. We observe a spin-polarized excitation spectrum of the Andreev bound state, which can be fully spin-polarized, despite strong spin-orbit interaction in the InSb nanowires. Decoupling the hybrid from the normal lead causes a current blockade, by trapping the Andreev bound state in an excited state. Spin-polarized spectroscopy of hybrid nanowire devices, as demonstrated here, is proposed as an experimental tool to support the observation of topological superconductivity.

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Section: Introductionmentioning

confidence: 91%

Spin-filtered measurements of Andreev bound states in semiconductor-superconductor nanowire devices

van Driel,

Wang,

Bordin

et al. 2023

Nat Commun

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“…These limitations have been mitigated by recent advancements in epitaxial growth techniques [7] that have paved the way for the realization of clean superconductor-semiconductor (SC-SM) interfaces. These breakthroughs enable an unprecedented tunability of the Josephson couplings through electrostatic gates [8][9][10][11][12], as well as the fabrication of multiple quantum dots on the same hybrid device [13,14], thereby revolutionizing the potential of JJAs as quantum simulators. Moreover, SC-SM platforms allow for on-chip patterning of arbitrary geometries in one and two dimensions, a precise control of the magnetic fluxes in these systems [11,12], and a relatively easy scalability.…”

Section: Introductionmentioning

confidence: 99%

Thouless pumping in Josephson junction arrays

Athanasiou,

Nielsen,

Wauters

et al. 2024

SciPost Phys.

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Recent advancements in fabrication techniques have enabled unprecedented clean interfaces and gate tunability in semiconductor-superconductor heterostructures. Inspired by these developments, we propose protocols to realize Thouless quantum pumping in electrically tunable Josephson junction arrays. We analyze, in particular, the implementation of the Rice-Mele and the Harper-Hofstadter pumping schemes, whose realization would validate these systems as flexible platforms for quantum simulations. We investigate numerically the long-time behavior of chains of controllable superconducting islands in the Coulomb-blockaded regime. Our findings provide new insights into the dynamics of periodically driven interacting systems and highlight the robustness of Thouless pumping with respect to boundary effects typical of superconducting circuits.

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Side‐Gate Modulation of Supercurrent in InSb Nanoflag‐Based Josephson Junctions

Turini,

Salimian,

Carrega

et al. 2024

Physica Status Solidi (b)

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InSb nanoflags, due to their intrinsic spin–orbit interactions, are an interesting platform in the study of planar Josephson junctions. Ballistic transport, combined with high transparency of the superconductor/semiconductor interfaces, is reported to lead to interesting phenomena such as the Josephson diode effect. The versatility offered by the planar geometry can be exploited to manipulate both carrier concentration and spin–orbit strength by electrical means. Herein, experimental results on InSb nanoflag‐based Josephson junctions fabricated with side gates placed in close proximity to the junction are presented. It is shown that side gates can efficiently modulate the current through the junction, both in the dissipative and in dissipation‐less regimes, similar to what is obtained with a conventional back gate. Furthermore, the side gates can be used to influence the Fraunhofer interference pattern induced by the presence of an external out‐of‐plane magnetic field.

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Spin spectroscopy of a hybrid superconducting nanowire using side-coupled quantum dots

Cited by 6 publications

References 45 publications

Spin-filtered measurements of Andreev bound states in semiconductor-superconductor nanowire devices

Spin-filtered measurements of Andreev bound states in semiconductor-superconductor nanowire devices

Thouless pumping in Josephson junction arrays

Side‐Gate Modulation of Supercurrent in InSb Nanoflag‐Based Josephson Junctions

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