Evidence of Nodal Superconductivity in Monolayer 1H-TaS2 with Hidden Order Fluctuations

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2023-11-09
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Language
en
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Advanced Materials, Volume 35, issue 45
Abstract
Unconventional superconductors represent one of the fundamental directions in modern quantum materials research. In particular, nodal superconductors are known to appear naturally in strongly correlated systems, including cuprate superconductors and heavy-fermion systems. Van der Waals materials hosting superconducting states are well known, yet nodal monolayer van der Waals superconductors have remained elusive. Here, using low-temperature scanning tunneling microscopy (STM) and spectroscopy (STS) experiments, it is shown that pristine monolayer 1H-TaS2 realizes a nodal superconducting state. Non-magnetic disorder drives the nodal superconducting state to a conventional gapped s-wave state. Furthermore, many-body excitations emerge close to the gap edge, signalling a potential unconventional pairing mechanism. The results demonstrate the emergence of nodal superconductivity in a van der Waals monolayer, providing a building block for van der Waals heterostructures exploiting unconventional superconducting states.
Description
Funding Information: V.V. and S.C.G. contributed equally to this work. This research made use of the Aalto Nanomicroscopy Center (Aalto NMC) facilities and was supported by the European Research Council (ERC‐2017‐AdG no. 788185 “Artificial Designer Materials”) and Academy of Finland (Academy professor funding nos. 318995 and 320555, Academy research fellow nos. 331342, 336243 and no. 338478 and 346654). L.Y. acknowledges support from the Jiangsu Specially‐Appointed Professors Program, Suzhou Key Laboratory of Surface and Interface Intelligent Matter (Grant SZS2022011), Suzhou Key Laboratory of Functional Nano & Soft Materials, Collaborative Innovation Center of Suzhou Nano Science & Technology, and the 111 Project. The authors acknowledge the computational resources provided by the Aalto Science‐IT project. | openaire: EC/H2020/788185/EU//E-DESIGN
Keywords
monolayer transition metal dichalcogenide, nodal superconductivity, scanning tunneling microscopy (STM), scanning tunneling spectroscopy, unconventional superconductivity, van der Waals materials
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Citation
Vaňo , V , Ganguli , S C , Amini , M , Yan , L , Khosravian , M , Chen , G , Kezilebieke , S , Lado , J L & Liljeroth , P 2023 , ' Evidence of Nodal Superconductivity in Monolayer 1H-TaS 2 with Hidden Order Fluctuations ' , Advanced Materials , vol. 35 , no. 45 , 2305409 . https://doi.org/10.1002/adma.202305409