Valley–dimensionality-locking of superconductivity in cubic phosphides
Cite this dataset
Ao, Lingyi et al. (2023). Valley–dimensionality-locking of superconductivity in cubic phosphides [Dataset]. Dryad. https://doi.org/10.5061/dryad.dncjsxm4t
Abstract
Two-dimensional superconductivity is primarily realized in atomically-thin layers through extreme exfoliation, epitaxial growth, or interfacial gating. Apart from their technical challenges, these approaches lack sufficient control over the Fermiology of superconducting systems. Here, we offer a Fermiology-engineering approach, allowing to desirably tune the coherence length of Cooper pairs and the dimensionality of superconducting states in arsenic phosphides AsxP1−x under hydrostatic pressure. We demonstrate how this turns these compounds into tunable two-dimensional superconductors with a dome-shaped phase diagram even in the bulk limit. This peculiar behavior is shown to result from an unconventional valley-dimensionality locking mechanism, driven by a delicate competition between three-dimensional hole-type and two-dimensional electron-type energy pockets spatially separated in momentum space. The resulting dimensionality crossover is further discussed to be systematically controllable by pressure and stoichiometry tuning. Our findings pave a unique way to realize and control superconducting phases with special pairing and dimensional orders.
Funding
National Natural Science Foundation of China, Award: 51861145201
National Natural Science Foundation of China, Award: 52072168
National Natural Science Foundation of China, Award: 21733001
National Natural Science Foundation of China, Award: 91750101
National Natural Science Foundation of China, Award: 12204232
National Natural Science Foundation of China, Award: 52188101
Ministry of Science and Technology of the People's Republic of China, Award: 2018YFA0306200
Ministry of Science and Technology of the People's Republic of China, Award: 2021YFA1202901
National Natural Science Foundation of China, Award: BK20220758
Japan Society for the Promotion of Science, Award: JP19H05602
Japan Society for the Promotion of Science, Award: JP21H01792