Unconventional Meissner screening induced by chiral molecules in a conventional superconductor

Alpern, Hen; Amundsen, Morten; Hartmann, Roman; Sukenik, Nir; Spuri, Alfredo; Yochelis, Shira; Prokscha, T.; Gutkin, Vitaly; Anahory, Yonathan; Scheer, Elke; Linder, Jacob; Salman, Z.; Millo, Oded; Paltiel, Yossi; Bernardo, Angelo Di

doi:10.1103/physrevmaterials.5.114801

Cited by 18 publications

(19 citation statements)

References 42 publications

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“…The effect of helical molecules chemisorbed on the conventional SC has been reported in the recent experiments [30][31][32]. Conductance spectra are observed for the spin-singlet s-wave SC (Nb) through the helical molecules by the STS and STM measurements.…”

Section: Introductionmentioning

confidence: 83%

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Topological superconductivity in helical crystals

Yoshida¹,

Yada²,

Tanaka³

et al. 2023

Preprint

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We study superconductivity and surface Andreev bound states in helical crystals. We consider the interlayer pairings along the helical hopping and investigate the surface local density of states on the (001) and zigzag surfaces for all the possible irreducible representations. There are three and four irreducible representations exhibiting the zero energy peaks in the local density of states at the (001) and zigzag surfaces of helical lattices, respectively. By calculating the one dimensional winging number, we show that these appearances of the zero energy peaks stem from the surface Andreev bound states.

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Section: Introductionmentioning

confidence: 83%

“…In the above experiments [30][31][32], the helical molecules have been absorbed on the Nb substrate. In this paper, we focus on the possibility that the pair potentials are induced in the helical molecules by the superconducting proximity effect.…”

Section: Introductionmentioning

confidence: 99%

Topological superconductivity in helical crystals

Yoshida¹,

Yada²,

Tanaka³

et al. 2023

Preprint

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“…Despite that we are currently aware of experimental results which comply with our theoretical discussion [8,18,19,22,28,29], it would intriguing to consider the effects under more extreme conditions, for instance, measurements of magnetically asymmetric thermopower or using magnetic force microscopy to measure asymmetric forces of chiral molecules attached to surface.…”

mentioning

confidence: 90%

“…Molecules, as well as single atoms, which are in closed shell configurations when isolated can acquire a magnetic state when, e.g., immersed in solution [1,2], attached on a surface [3][4][5][6][7][8][9], or being in embedded in clusters comprising several components [10][11][12][13][14][15][16][17]. Such properties can be exploited in, for instance, anomalous Hall devices [18][19][20], electron spin resonance [21,22], exploration of superconductivity in presence of spin impurities [23] giving rise to Yu-Shiba-Rusinov states [24,25], and in structures with properties, such as coercivity [13][14][15][16][17] and spin-filtering [16,[26][27][28], that strengthens with temperature.…”

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confidence: 99%

Emergent magnetism as a cooperative effect of interactions and reservoir

Shiranzaei¹,

S.²,

Fransson³

2023

Preprint

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Closed shell molecular structures are under normal conditions time-reversal invariant. Experimental evidences point, however, towards that this invariance may be locally violated when the structure is in contact with a particle reservoir. The mechanisms behind such local symmetry breaking are not clear by any means. By considering a minimal model for a closed shell structure, here we propose that the symmetry breaking may result from a combination of internal and/or external interactions. It is shown that a magnetic moment of a localized electron level can be generated and maintained under the influence of such combination. The theoretical results should cast new light on the mechanisms that may form magnetic properties in molecular compounds.

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“…This was demonstrated using a variety of techniques, including STS, [ 23,24 ] transport measurements on devices, [ 25,26 ] and muon spin rotation/relaxation. [ 27 ] The signature of chiral‐induced equal‐spin superconductivity was found for various superconductors Nb, proximitized Au/Nb bilayers, and NbSe 2 . The ability of such non‐magnetic molecules to generate magnetic‐like effects was observed also in other cases, as they have shown the ability to magnetize a ferromagnet [ 28 ] and enhance magnetism in gold.…”

Section: Introductionmentioning

confidence: 99%

Scanning SQUID Imaging of Reduced Superconductivity Due to the Effect of Chiral Molecule Islands Adsorbed on Nb

Ozeri

Devidas

Alpern

et al. 2023

Adv Materials Inter

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Unconventional superconductivity was realized in systems comprising a monolayer of magnetic adatoms adsorbed on conventional superconductors, forming Shiba‐bands. Another approach to induce unconventional superconductivity and 2D Shiba‐bands was recently introduced, namely, by adsorbing chiral molecules (ChMs) on conventional superconductors, which act in a similar way to magnetic impurities as verified by conductance spectroscopy. However, the fundamental effect ChMs have on the strength of superconductivity has not yet been directly observed and mapped. In this work, local magnetic susceptometry is applied on heterostructures comprising islands of ChMs (α‐helix L‐polyalanine) monolayers adsorbed on Nb. It is found that the ChMs alter the superconducting landscape, resulting in spatially‐modulated weaker superconductivity. Surprisingly, the reduced diamagnetic response is located along the perimeter of the islands with respect to both their interior and the bare Nb. The authors suggest that topological edge‐states forming at the edges are the source of the reduced superconductivity, akin to the case of magnetic islands. The results pave new paths for the realization of topological‐superconductivity‐based devices with changing order parameter.

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Unconventional Meissner screening induced by chiral molecules in a conventional superconductor

Cited by 18 publications

References 42 publications

Topological superconductivity in helical crystals

Topological superconductivity in helical crystals

Emergent magnetism as a cooperative effect of interactions and reservoir

Scanning SQUID Imaging of Reduced Superconductivity Due to the Effect of Chiral Molecule Islands Adsorbed on Nb

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