Abstract
The Rashba effect, a momentum-dependent spin splitting of electrical bands is a dramatic phenomena originated from lack of the space inversion symmetry. When the Rashba effect meets superconductivity, novel superconducting phenomena is predicted to realize: mixing of singlet-triplet component, spatial modulation of order parameter by Fulde-Ferrell-Larkin-Ovchinnikov mechanism, transition to topological superconductivity etc. Although the surface two-dimensional electron system has been expected to combine these independent frameworks, there has been no report on coexistence of them so far. Here, a one-atom-layer compound made of one monolayer of Tl and one-third monolayer of Pb on a Si (111) surface, known as Rashba-metallic surface system is presented to exhibit two-dimensional superconducting transport properties. The observed transition temperature of 2.26 K is sizable, while the energy of Rashba spin splitting is still larger upto 250 meV, promising for the emergence of the exotic superconductivity.
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Ichinokura, S. (2018). Thallium-Lead Monatomic-layer Compound. In: Observation of Superconductivity in Epitaxially Grown Atomic Layers. Springer Theses. Springer, Singapore. https://doi.org/10.1007/978-981-10-6853-9_5
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DOI: https://doi.org/10.1007/978-981-10-6853-9_5
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