In-gap bound states induced by a single nonmagnetic impurity in sign-preserving s-wave superconductors with incipient bands

Yi Gao; Yan Yu; Tao Zhou; Huaixiang Huang; Qiang-Hua Wang

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In-gap bound states induced by a single nonmagnetic impurity in sign-preserving s-wave superconductors with incipient bands

机译：单个非磁性杂质在具有初始能带的保持符号的S波超导体中引起的能隙内束缚态

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We have investigated the in-gap bound states (IGBS) induced by a single nonmagnetic impurity in multiband superconductors with incipient bands. Contrary to the naive expectation, we found that even if the superconducting (SC) order parameter is a sign-preserving s wave on the Fermi surfaces, the incipient bands may still affect the appearance and locations of the IGBS, although the gap between the incipient bands and the Fermi level is much larger than the SC gap. Therefore in scanning tunneling microscopy experiments, the IGBS induced by a single nonmagnetic impurity are not the definitive evidence for the sign-changing order parameter on the Fermi surfaces. Our findings have special implications for the experimental determination of the pairing symmetry in the FeSe-based superconductors.

机译：我们已经研究了由单个非磁性杂质在具有初始能带的多能带超导体中引起的能隙结合态（IGBS）。与幼稚的期望相反，我们发现即使超导（SC）阶参数是费米表面上的符号保持s波，初始带仍可能影响IGBS的外观和位置，尽管初始带之间的间隙带和费米能级远大于SC差距。因此，在扫描隧道显微镜实验中，由单一非磁性杂质引起的IGBS并不是费米表面上符号变化阶参数的确定证据。我们的发现对基于FeSe的超导体中配对对称性的实验确定具有特殊意义。

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来源
《Physical review》 |2017年第22期|220507.1-220507.5|共5页
作者
Yi Gao; Yan Yu; Tao Zhou; Huaixiang Huang; Qiang-Hua Wang;
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作者单位

Department of Physics, Nanjing Normal University, Nanjing 210023, China;

Department of Physics, Nanjing Normal University, Nanjing 210023, China;

College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;

Department of Physics, Shanghai University, Shanghai 200444, China;

National Laboratory of Solid State Microstructures and School of Physics, Nanjing University, Nanjing 210093, China,Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China;

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1. In-gap bound states induced by a single nonmagnetic impurity in sign-preserving s-wave superconductors with incipient bands [J] . Yi Gao, Yan Yu, Tao Zhou, Physical Review. B, Condensed Matter . 2017,第21a22CD期

机译：通过初始频段签署的S波超导体中的单个非磁性杂质引起的间隙义态态
2. In-gap bound states induced by nonmagnetic impurities in two-band s_± superconductors [J] . T. K. Ng, Y. Avishai Physical review . 2009,第10期

机译：两带s_±超导体中非磁性杂质引起的能隙内束缚态
3. In-gap bound states induced by interstitial Fe impurities in iron-based superconductors [J] . Zhang Degang Physica, C. Superconductivity and its applications . 2015,第Null期

机译：铁基超导体中间隙Fe杂质诱导的能隙内结合态
4. Influence of temperature on the impurity-induced s_± → s_(++) transition in the two-band model for Fe-based superconductors [C] . Vadim Shestakov, Maxim M Korshunov Euro-Asian Symposium "Trends in Magnetism" . 2020

机译：温度对Fe基超导器的双频模型中的杂质诱导的S_±→S _（++）转换的影响
5. Yu-Shiba-Rusinov bound states induced by a spin flipper in the vicinity of a s-wave superconductor [O] . Subhajit Pal, Colin Benjamin -1

机译：s波超导体附近的自旋鳍状子引起的Yu-Shiba-Rusinov束缚态
6. In-gap bound states induced by a single nonmagnetic impurity in sign-preserving s-wave superconductors with incipient bands [O] . Gao, Yi, Yu, Yan, Zhou, Tao, 2017

机译：由单个非磁性杂质引起的间隙束缚态具有初始波段的符号保持s波超导体

In-gap bound states induced by a single nonmagnetic impurity in sign-preserving s-wave superconductors with incipient bands

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