| Observation of Coulomb Gap and Enhanced Superconducting Gap in Nano-Sized Pb Islands Grown on SrTiO3 |
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| 作者姓名： | 袁永浩 王心童 宋灿立 王立莉 何珂 马旭村 姚宏 李渭 薛其坤 |
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| 作者单位： | State Key Laboratory of Low-Dimensional Quantum Physics;Frontier Science Center for Quantum Information;Institute for Advanced Study;Beijing Academy of Quantum Information Sciences |
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| 基金项目： | the National Natural Science Foundation under Grant Nos.11674191 and 11825404;the National Key Program for S&T Research and Development under Grant No No.2016YFA0301002;the Beijing Advanced Innovation Center for Future Chip(ICFC).W.L.was also supported by Beijing Young Talents Plan. |
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| 摘 要： | We report high-resolution scanning tunneling microscopy(STM)study of nano-sized Pb islands grown on SrTiO3,where three distinct types of gaps with different energy scales are revealed.At low temperature,we find that the superconducting gap(△s)in nano-sized Pb islands is significantly enhanced from the one in bulk Pb,while there is no essential change in superconducting transition temperature Tc,giving rise to a larger BCS ratio 2△s/kBTc^8.31 and implying stronger electron-phonon coupling.The stronger coupling can originate from the interface electron-phonon interactions between Pb islands and SrTiO3.As the superconducting gap is totally suppressed under applied magnetic field,the Coulomb gap with apparent V-shape emerges.Moreover,the size of Coulomb gap(Ac)depends on the lateral size of Pb islands(R)with △c-1/R^035,indicating that quantum size effect can significantly influence electronic correlations.Our experimental results shall shed important light on the interplay among superconductivity,quantum size effect and correlations in nano-sized strong-coupling superconductors.
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| 关 键 词： | sized stronger PHONON |
Observation of Coulomb Gap and Enhanced Superconducting Gap in Nano-Sized Pb Islands Grown on SrTiO_3 |
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| Yonghao Yuan,Xintong Wang,Canli Song,Lili Wang,Ke He,Xucun Ma,Hong Yao,Wei Li,Qi-Kun Xue.Observation of Coulomb Gap and Enhanced Superconducting Gap in Nano-Sized Pb Islands Grown on SrTiO3[J].Chinese Physics Letters,2020(1):78-82. |
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| Authors: | Yonghao Yuan Xintong Wang Canli Song Lili Wang Ke He Xucun Ma Hong Yao Wei Li Qi-Kun Xue |
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| Affiliation: | (State Key Laboratory of Low-Dimensional Quantum Physics,Department of Physics,Tsinghua University,Beijing 100084;Frontier Science Center for Quantum Information,Beijing 100084;Institute for Advanced Study,Tsinghua University,Beijing 100084;Beijing Academy of Quantum Information Sciences,Beijing 100193) |
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