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Quantum phase engineering of a metallic monolayer on a semiconductor

Abstract : Superconductivity in metallic monolayer systems is a poorly understood phenomenon and it may be the key for quantum computing. For a better understanding of this phenomenon and to study other physical interesting phenomena like Rashba spin-orbit interaction and their influence on superconductivity, a mixing of different metals evaporated on a semiconductor is presented as a promising system. Firstly, we studied the SIC (Striped Incommensurate) Pb/Si(111) phase which is a superconductor at T_c~1.8 K using a scanning tunnelling microscope at low temperature. Studying the quasiparticle interferences patterns, one can show that two neighbouring domains have different physical behaviours. Making thus a mixture of gold and lead in the metallic monolayer evaporated on the silicon, a new phase called Decorated SIC is found, which is composed of different terraces. Each terrace is encircled by a double atomic line. Performing Gundlach Oscillations, one can show that the nature of these lines and the content which they encircle are not the same. These lines are attributed to gold atoms and, although the relief has different levels, it has been shown to have the same crystallographic structure. The transport measurements made on the SIC and Decorated SIC show that the system is sensitive to defects. Indeed, we observe that the superconducting transition is not reached for the SIC, whereas for the Decorated SIC this transition is reached, maybe the present gold atoms favor the propagation of the superconductivity in this latter system.
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Submitted on : Tuesday, August 31, 2021 - 3:26:32 PM
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  • HAL Id : tel-03330143, version 1

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Jonathan Baptista. Quantum phase engineering of a metallic monolayer on a semiconductor. Superconductivity [cond-mat.supr-con]. Sorbonne Université, 2019. English. ⟨NNT : 2019SORUS594⟩. ⟨tel-03330143⟩

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