Josephson current and density of states in proximity circuits with s_(+-) superconductors

Stanislav Apostolov; Alex Levchenko

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Josephson current and density of states in proximity circuits with s_(+-) superconductors

机译：具有s _（+-）超导体的接近电路中的约瑟夫森电流和状态密度

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摘要

We study the emergent proximity effect in mesoscopic circuits that involve a conventional superconductor and an unconventional pnictide superconductor separated by a diffusive normal or ferromagnetic wire. The focus is placed on revealing signatures of the proposed s_(+-) state of pnictides from the proximity-induced density of states and Josephson current. We find analytically a universal result for the density of states that exhibits both the Thouless gap at low energies and peculiar features near the superconducting gap edges at higher energies. The latter may be used to discriminate between s_(+-) and s_(++) symmetry scenarios in scanning tunneling spectroscopy experiments. We also calculate Josephson current-phase relationships for different junction configurations, which are found to display robust 0-π transitions for a wide range of parameters.

机译：我们研究了介观电路中出现的接近效应，介观电路包括常规超导体和由扩散法线或铁磁线隔开的非常规Pnictide超导体。重点放在从接近感应的状态密度和约瑟夫森电流揭示拟议的s _（+-）肽的特征上。从分析上我们发现，状态密度的通用结果既显示了低能的Thouless间隙，又显示了高能的超导间隙边缘附近的特殊特征。在扫描隧道光谱实验中，后者可用于区分s _（+-）和s _（++）对称方案。我们还计算了不同结构型的约瑟夫森电流-相位关系，发现它们对于各种参数都显示出鲁棒的0-π跃迁。

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来源
《Physical review》 |2012年第22期|224501.1-224501.5|共5页
作者
Stanislav Apostolov; Alex Levchenko;
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作者单位

Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA;

Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA;

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正文语种 eng
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关键词
proximity effects; Andreev effect; SN and SNS junctions; tunneling phenomena; point contacts, weak links, josephson effects; mesoscopic and nanoscale systems;

机译：邻近效应;安德列夫效应;SN和SNS交界处;隧道现象;点接触;薄弱环节;约瑟夫森效应;介观和纳米系统;

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1. Josephson current in a three-layered superconductor-ferromagnet-superconductor system with inclusion of the proximity effect and Umklapp processes at the inner boundaries [J] . Tumanov V.A., Proshin Y.N. Physics of the solid state . 2011,第9期

机译：三层超导体-铁磁体-超导体系统中的约瑟夫森电流，在内边界处包含邻近效应和Umklapp过程
2. Proximity-Driven Source of Highly Spin-Polarized ac Current on the Basis of Superconductor/Weak Ferromagnet/Superconductor Voltage-Biased Josephson Junction [J] . Bobkov AM, Bobkova IV JETP Letters . 2008,第12期

机译：基于超导体/弱铁磁体/超导体偏压约瑟夫森结的高度自旋极化交流电流的接近驱动源
3. Quantum transport in ballistic s_±-wave superconductors with interband coupling: Conductance spectra, crossed Andreev reflection, and Josephson current [J] . Iver Bakken Sperstad, Jacob Linder, Asle Sudbo Physical review . 2009,第14期

机译：带内耦合弹道s_±波超导体中的量子传输：电导谱，安德列夫交叉反射和约瑟夫森电流
4. Nonstationary Josephson and quasiparticletunnel currents through junctions between superconductors with spin-density waves [C] . A. M. Gabovich, A. I. Voitenko NATO Advanced Study Institute on High-Tc Superconductors and Related Materials . 2001

机译：非营养的约瑟夫森和QuasiparticleLunnel通过具有旋转密度波之间的超导体之间的连接电流
5. Non-sinusoidal current-phase relations in superconductor-ferromagnet-superconductor Josephson junctions. [D] . Stoutimore, Micah John Atman. 2009

机译：超导体-铁磁体-超导体约瑟夫森结中的非正弦电流-相位关系。
6. Current driven transition from Abrikosov-Josephson to Josephson-like vortex in mesoscopic lateral S/S’/S superconducting weak links [O] . G. Carapella, P. Sabatino, C. Barone, -1

机译：在介观的横向S / S’/ S超导薄弱环节中由电流驱动的从Abrikosov-Josephson过渡到约瑟夫森状涡
7. Josephson current and density of states in proximity circuits with s+- superconductors [O] . Apostolov, Stanislav, Levchenko, Alex 2012

机译：Josephson电流和接近电路中的状态密度与s + - 超导体

Josephson current and density of states in proximity circuits with s_(+-) superconductors

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