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Discovery of a Cooper-pair density wave state in a transition-metal dichalcogenide

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Davis,  J. C. Séamus
J. C. Séamus Davis, Max Planck Fellow, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Liu, X., Chong, Y. X., Sharma, R., & Davis, J. C. S. (2021). Discovery of a Cooper-pair density wave state in a transition-metal dichalcogenide. Science, 372(6549), 1447-1452. doi:10.1126/science.abd4607.


Cite as: https://hdl.handle.net/21.11116/0000-0008-E930-B
Abstract
Pair density wave (PDW) states are defined by a spatially modulating superconductive order parameter. To search for such states in transition-metal dichalcogenides (TMDs), we used high-speed atomicresolution scanned Josephson-tunneling microscopy. We detected a PDW state whose electron-pair density and energy gap modulate spatially at the wave vectors of the preexisting charge density wave (CDW) state. The PDW couples linearly to both the s-wave superconductor and the CDW and exhibits commensurate domains with discommensuration phase slips at the boundaries, conforming those of the lattice-locked commensurate CDW. Nevertheless, we found a global dF ≡ ± 2p/3 phase difference between the PDW and CDW states, possibly owing to the Cooper-pair wave function orbital content. Our findings presage pervasive PDW physics in the many other TMDs that sustain both CDW and superconducting states. © 2021 American Association for the Advancement of Science. All rights reserved.