Superconducting Proximity Effect in Quantum Dots

量子点中的超导邻近效应

• 批准号: 193403257
• 负责人: Professor Dr. Jürgen König
• 金额: --
• 依托单位: Fakultät für Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/193403257?language=en
• 关键词: Superconducting; Proximity; Effect; Quantum; Dots

Well-defined and -controllable nanostructures such as quantum dots are ideal model systems to investigate the interplay of Coulomb interaction, nonequilibrium, and collective order. We study theoretically electronic transport through systems containing interacting quantum dots coupled to superconducting leads. Superconducting correlations are induced on the quantum dots by the equilibrium and nonequilibrium proximity effect and can be manipulated via gate and bias voltages. They affect the transport characteristics, e.g., of the Josephson or the local and the nonlocal Andreev currents. For hybrid systems involving noncollinear magnetism, unconventional superconducting pairing can be induced. The main objective of the present project is to develop and apply theoretical tools that properly take into account the important role played by Coulomb interaction in the quantum dot. We will identify for various device geometries signatures of the induced conventional and unconventional superconducting correlations in transport quantities such as the current and the current noise.

定义明确且可控的纳米结构如量子点是研究库仑相互作用、非平衡态和集体有序相互作用的理想模型系统。我们从理论上研究电子输运通过系统包含相互作用的量子点耦合到超导导线。超导关联是由量子点的平衡和非平衡邻近效应引起的，并且可以通过栅极和偏置电压来操纵。它们影响运输特性，例如，约瑟夫森电流或局域和非局域安德列耶夫电流。对于包含非共线磁的混合系统，可以诱导非常规超导配对。本项目的主要目标是开发和应用理论工具，适当考虑库仑相互作用在量子点中发挥的重要作用。我们将确定各种设备的几何形状的签名的诱导常规和非常规超导相关的运输量，如电流和电流噪声。

项目成果

Iterative path integral summation for nonequilibrium quantum transport

非平衡量子输运的迭代路径积分求和

• DOI: 10.1002/pssb.201349187
• 发表时间: 2013
• 期刊: physica status solidi (b)
• 作者: S. Weiss;R. Hützen;D. Becker;J. Eckel;R. Egger;M. Thorwart
• 通讯作者: M. Thorwart

Renormalization effects in interacting quantum dots coupled to superconducting leads

耦合到超导引线的相互作用量子点的重正化效应

• DOI: 10.1103/physrevb.87.014509
• 发表时间: 2013
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: D. Futterer;J. Swiebodzinski;M. Governale;J. König
• 通讯作者: J. König

Coherent dynamics in stochastic systems revealed by full counting statistics

• DOI: 10.1103/physrevb.98.035409
• 发表时间: 2018-03
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: P. Stegmann;J. Konig;S. Weiss

Driven superconducting proximity effect in interacting quantum dots

• DOI: 10.1103/physrevb.85.094518
• 发表时间: 2012-01
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Ali G. Moghaddam;M. Governale;J. Konig

Unconventional superconductivity in double quantum dots

• DOI: 10.1103/physrevb.90.220501
• 发表时间: 2014-04
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: B. Sothmann;S. Weiss;M. Governale;Jurgen Konig