@article{5bc81b0744cf4d96957ae484a26b52b7,
title = "Ising pairing in superconducting NbSe2 atomic layers",
abstract = "The properties of two-dimensional transition metal dichalcogenides arising from strong spin-orbit interactions and valley-dependent Berry curvature effects have recently attracted considerable interest. Although single-particle and excitonic phenomena related to spin-valley coupling have been extensively studied, the effects of spin-valley coupling on collective quantum phenomena remain less well understood. Here we report the observation of superconducting monolayer NbSe 2 with an in-plane upper critical field of more than six times the Pauli paramagnetic limit, by means of magnetotransport measurements. The effect can be interpreted in terms of the competing Zeeman effect and large intrinsic spin-orbit interactions in non-centrosymmetric NbSe 2 monolayers, where the electron spin is locked to the out-of-plane direction. Our results provide strong evidence of unconventional Ising pairing protected by spin-momentum locking, and suggest further studies of non-centrosymmetric superconductivity with unique spin and valley degrees of freedom in the two-dimensional limit.",
author = "Xiaoxiang Xi and Zefang Wang and Weiwei Zhao and Park, {Ju Hyun} and Law, {Kam Tuen} and Helmuth Berger and L{\'a}szl{\'o} Forr{\'o} and Jie Shan and Mak, {Kin Fai}",
note = "Funding Information: We thank M. H.W. Chan for fruitful discussions. This work was supported by the US Department of Energy, O_ce of Basic Energy Sciences (contract No. DESC0013883 (K.F.M.) and DESC0012635 (J.S.)). Optical spectroscopy was supported by the National Science Foundation (NSF) under Award No. DMR-1410407. The NHMFL is supported by the NSF Cooperative Agreement No. DMR-1157490 and the State of Florida. K.T.L. is supported by HKUST3/CRF/13G and the Croucher Innovation Grant. The work in Lausanne was supported by the Swiss National Science Foundation.We also acknowledge support from the NSF MRSEC under Award No. DMR-1420451 (Z.W.) and the MRI-2D Center at Penn State University (X.X.). Funding Information: We thank M. H. W. Chan for fruitful discussions. This work was supported by the US Department of Energy, Office of Basic Energy Sciences (contract No. DESC0013883 (K.F.M.) and DESC0012635 (J.S.)). Optical spectroscopy was supported by the National Science Foundation (NSF) under Award No. DMR-1410407. The NHMFL is supported by the NSF Cooperative Agreement No. DMR-1157490 and the State of Florida. K.T.L. is supported by HKUST3/CRF/13G and the Croucher Innovation Grant. The work in Lausanne was supported by the Swiss National Science Foundation. We also acknowledge support from the NSF MRSEC under Award No. DMR-1420451 (Z.W.) and the MRI-2D Center at Penn State University (X.X.). Publisher Copyright: {\textcopyright} 2016 Macmillan Publishers Limited.",
year = "2016",
month = feb,
day = "2",
doi = "10.1038/nphys3538",
language = "English (US)",
volume = "12",
pages = "139--143",
journal = "Nature Physics",
issn = "1745-2473",
publisher = "Nature Publishing Group",
number = "2",
}