Cooper Pair Excitation Mediated by a Molecular Quantum Spin on a Superconducting Proximitized Gold Film

Trivini, Stefano; Ortuzar, Jon; Vaxevani, Katerina; Li, Jingchen; Bergeret, F. S.; Cazalilla, Miguel A.; Pascual, José

doi:10.1103/physrevlett.130.136004

Cited by 18 publications

(4 citation statements)

References 55 publications

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“…The results of our paper can have implications for the physics of transmon devices that have been recently realized in a semiconductingsuperconducting nanowires coupled to a quantum dot [15,16]. Our results can be straightforwardly extended to other setups, as for example molecules on the surface of superconductors with larger spin number, magnetic anisotropy, as well as anisotropic exchange coupling [24,35].…”

Section: Discussionmentioning

confidence: 60%

“…1), which can be realized in superconductor/semiconducting nanowire heterostructures in proximity to a FMI [37]. For other setups relevant to magnetic atoms or molecules on the surface of superconductors, our results can be straightforwardly extended to account for larger impurity spins, single-ion anisotropy, as well as anisotropic exchange [24,35]. The remaining sections of this paper are organized as follows: In the next section, we introduce the model and describe the many-body spectrum of the FMI/superconductor-quantum dot system as a function of the exchange coupling, the exchange field, and the external magnetic field.…”

Section: Introductionmentioning

confidence: 80%

“…To account for quantum fluctuations in the spectrum of a magnetic impurity coupled to such a spin-split superconductor, we extend the single-site model used in Refs. [24,34,35]. This approach provides an excellent qualitative description of the spectra obtained experimentally [35].…”

Section: Introductionmentioning

confidence: 93%

“…[24,34,35]. This approach provides an excellent qualitative description of the spectra obtained experimentally [35]. It also captures the properties of the ground state and low lying states of the system while being computationally cheaper than the numerical renormalization group (NRG) [27,36].…”

Section: Introductionmentioning

confidence: 99%

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Yu-Shiba-Rusinov (YSR) states arise as subgap excitations of a magnetic impurity in a superconducting host. Taking into account the quantum nature of the impurity spin in a single-site approximation, we study the spectral properties of the YSR excitations of a system of magnetic impurity in a spin-split superconductor, i.e., a superconductor in proximity to a ferromagnetic insulator at zero external magnetic fields. The YSR excitations of this system exhibit a robust spin polarization that is protected from fluctuations and environmental noise by the exchange field of the ferromagnetic insulator, which can be as large as a few Tesla. We compare the results of this quantum approach to the classical approach, which conventionally predicts fully polarized YSR excitations even in the absence of exchange and external magnetic field. Turning on a small magnetic field, we show the latter splits the YSR excitations in the regime where the impurity is strongly coupled to the superconductor, whilst the classical approach predicts no such splitting. The studied system can potentially be realized in a tunnel junction connected to a quantum dot in proximity to a spin-split superconductor.

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Section: Discussionmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Metalloporphyrins as Building Blocks for Quantum Information Science

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The intrinsic quantum nature of molecules opens exciting opportunities for developing the field of quantum information science. In this context, porphyrins stand out as ideal building blocks for quantum technologies thanks to their unique optical and electrical properties as well as their capacity to accommodate metal atoms and ions. This review bridges the chemistry and physics of porphyrins, providing an overview of recent advances in porphyrin‐based molecular qubits. Starting from qubits, the review explores the potential of porphyrin units to combine, leading to the formation of quantum logic gates and hierarchical higher‐dimensional structures. Next, the exploitation of porphyrins' unique photophysical properties for realizing long‐lived high spin states is examined. These states are promising for the photogeneration of multi‐level systems and the optical initialization and control of molecular qubits. With a critical eye on the current state‐of‐the‐art, the review elucidates the future perspectives of porphyrins for advancing quantum technologies.

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Shaping Graphene Superconductivity with Nanometer Precision

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Graphene holds great potential for superconductivity due to its pure 2D nature, the ability to tune its carrier density through electrostatic gating, and its unique, relativistic‐like electronic properties. At present, still far from controlling and understanding graphene superconductivity, mainly because the selective introduction of superconducting properties to graphene is experimentally very challenging. Here, a method is developed that enables shaping at will graphene superconductivity through a precise control of graphene‐superconductor junctions. The method combines the proximity effect with scanning tunnelling microscope (STM) manipulation capabilities. Pb nano‐islands are first grown that locally induce superconductivity in graphene. Using a STM, Pb nano‐islands can be selectively displaced, over different types of graphene surfaces, with nanometre scale precision, in any direction, over distances of hundreds of nanometres. This opens an exciting playground where a large number of predefined graphene‐superconductor hybrid structures can be investigated with atomic scale precision. To illustrate the potential, a series of experiments are performed, rationalized by the quasi‐classical theory of superconductivity, going from the fundamental understanding of superconductor‐graphene‐superconductor heterostructures to the construction of superconductor nanocorrals, further used as “portable” experimental probes of local magnetic moments in graphene.

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Cooper Pair Excitation Mediated by a Molecular Quantum Spin on a Superconducting Proximitized Gold Film

Cited by 18 publications

References 55 publications

Robust spin polarization of Yu-Shiba-Rusinov states in superconductor/ferromagnetic insulator heterostructures

Robust spin polarization of Yu-Shiba-Rusinov states in superconductor/ferromagnetic insulator heterostructures

Metalloporphyrins as Building Blocks for Quantum Information Science

Shaping Graphene Superconductivity with Nanometer Precision

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