Large spin to charge conversion in the topological superconductor 
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 at room temperature

Li, Yang; Yang, Shuai; Sun, Dali; Sun, Yiming; Li, Yan; Vetter, Eric; Sun, Rui; Li, Na; Yang, Xu; Su, Lei; Gong, Zi-Zhao; Xie, Zhongkui; Zhao, Jianjun; He, Wei; Zhang, Xiang-Qun; Cheng, Ziqiang

doi:10.1103/physrevb.102.014420

Cited by 9 publications

(1 citation statement)

References 58 publications

(77 reference statements)

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“…Another feasible route to realize topological superconductors is to search for intrinsic superconductivity in topological materials, either in stoichiometric compounds at ambient or under high pressure, or by doping the topological materials to tune superconductivity. Indeed, superconductivity achieved in this manner has been observed in Cu x Bi 2 Se 3 [23,27,28], Au 2 Pb [29,30], PbTaSe 2 [31], β-PdBi 2 [32,33], S-doped MoTe 2 [34] etc., and in some cases, the experimental evidence of Majorana zero modes has been claimed.…”

Section: Introductionmentioning

confidence: 99%

Superconductivity in PtPb$_{4}$ with Possible Nontrivial Band Topology

Xu,

Li,

Zhang

et al. 2021

Preprint

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Superconductivity in topological quantum materials is much sought after as it represents the key avenue to searching for topological superconductors, which host a full pairing gap in the bulk but Majorana bound states at the surface. To date, however, the simultaneous realization of nontrivial band topology and superconductivity in the same material under ambient conditions remains rare. In this paper, we study both superconducting and topological properties of a binary compound PtPb4 (Tc ∼ 2.7 K) that was recently reported to exhibit large Rashba splitting, inherent to the heavy 5d Pt and 6p Pb. We show that in PtPb4, the specific heat jump at Tc reaches ∆C/γTc∼1.70±0.04, larger than 1.43 expected for the weak-coupling BCS superconductors. Moreover, the measurement of quantum oscillation suggests the possibility for a topological band structure, which is further studied by density functional theory calculations. Our study may stimulate future experimental and theoretical investigations in this intriguing material.

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Section: Introductionmentioning

confidence: 99%

Superconductivity in PtPb$_{4}$ with Possible Nontrivial Band Topology

Xu,

Li,

Zhang

et al. 2021

Preprint

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Quantifying Spin‐Charge Conversion Mechanisms for THz Emission in Magnetic Multilayers

Zhao,

Gayen,

Huang

et al. 2024

Advanced Optical Materials

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Ultrafast control of both electric and spin currents triggered by femtosecond laser pulse has attracted much attention due to future applications for broadband THz emitter as well as high‐speed spintronic devices. Optically generated spin current is converted to charge current via multiple spin‐charge conversion mechanisms, generating THz wave emission in magnetic multilayers. However, to date, quantitative and comparative investigation of THz emission originating from spin‐charge conversion mechanisms has not yet been fully explored. Here, direct and straightforward nondestructive probing to measure THz emission is provided at original Co/Pt and Co/Ta interfaces embedded in Pt/Co/Ta multilayers with polarization analysis of both optical pump and THz emission. These results allow a fundamental understanding of various spin‐charge conversion phenomena, which is a key basis for future spintronic THz source development.

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Bismuth‐Noble Metal Alloy Nanostructures Prepared by Colloidal Chemical Routes for Use in Hydrogen Evolution and Oxygen Reduction Electrocatalysis: Bi‐Pt Versus Bi‐Pd

Mourdikoudis

Regner

Gusmão

et al. 2022

Advanced Sustainable Systems

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oxidation reaction. In addition, an alteration of the active adsorption sites due to dilution of the catalytically active material may also take place when bimetallic catalysts are employed. Bismuth has already received interest as a Pt-modifier for electrocatalytic use. In this way, the noble metal quantity (and thus the overall cost) can be reduced, while the catalytic activity can be maintained (or even improved) by replacing a certain Pt amount with a less expensive metal. Bi may also modify the electronic structure of the Pt by lowering its d-band center. [1] Pt-Bi has been reported to be CO tolerant and it has exhibited higher catalytic performance for several oxidation reactions such as methanol, glycerol, ethylene glycol, and ethanol. The lower poisoning of Pt-Bi catalysts with CO has been proposed to be a determinant factor for the increase in catalytic activity of such materials. [2] Another example of an electrochemical reaction in which a bimetallic system can perform better than its monometallic counterpart is the electro-oxidation of formic acid. Pt-Bi showed a more negative onset potential and higher current density than monometallic Pt, together with the above-mentioned high tolerance to CO. [3] For the Pt-Bi alloy system, the PtBi 2 composition possesses a layered hexagonal crystal structure and has been suggested to behave as a 3D topological semimetal with very high magnetoresistance and unique electronic structures. A good comprehension of the electronic structure of PtBi 2 is required to properly assign the actual origin of its anomalous transport properties. [4] Pt-Bi bimetallic structures have found applications in thermoelectronics and batteries. Pt-Bi 2 O 3 has been shown to facilitate the photolysis of water, while single Pt or Bi 2 O 3 were unable to catalyze such reactions on their own. Pt-Bi/AC (activated carbon) is a commercially available catalyst for electrocatalysis and selective oxidation reactions. It has been suggested that Bi causes a geometric blocking effect on Pt, thus decreasing the active site ensemble of Pt. These decreased sites will still permit certain desired chemical reactions to occur, but they will not be active for specific undesired side reactions. The electronic properties of Bi help to increase the electrocatalytic activity of Pt, inhibiting poison effects, thanks to its small electron effective mass, low carrier concentrations, and highly anisotropic Fermi surface. [5,6] Pt-Bi alloy may not be the most suitable electrocatalyst for the oxygen reduction reaction (ORR); [7] still, though Pt-Bi catalysts Compositional and morphological tuning of bismuth-based nanomaterials is crucial to improve and broaden the application of such structures in a range of electrocatalytic reactions. Nanostructures composed of Pt-Bi and Pd-Bi alloys in different elemental proportions and shapes are produced by solvothermal and hydrothermal chemical routes at moderate temperatures. The alloying of cost-effective bismuth with platinum is found to be much more efficient than that with...

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Large spin to charge conversion in the topological superconductor β−PdBi2 at room temperature

Cited by 9 publications

References 58 publications

Superconductivity in PtPb$_{4}$ with Possible Nontrivial Band Topology

Superconductivity in PtPb$_{4}$ with Possible Nontrivial Band Topology

Quantifying Spin‐Charge Conversion Mechanisms for THz Emission in Magnetic Multilayers

Bismuth‐Noble Metal Alloy Nanostructures Prepared by Colloidal Chemical Routes for Use in Hydrogen Evolution and Oxygen Reduction Electrocatalysis: Bi‐Pt Versus Bi‐Pd

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