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Quantum dots with triplet and noncentrosymmetric superconducting leads

具有三重态和非中心对称超导引线的量子点

基本信息

批准号：
228719560
负责人：
Professor Dr. Carsten Timm
金额：
--
依托单位：
Institut für Theoretische Physik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/228719560?language=en
关键词：
Quantum dots triplet noncentrosymmetric superconducting

项目摘要

Two fields of current interest in condensed matter physics are combined in this theoretical project. One of them concerns unconventional superconductors, in particular so-called triplet and noncentrosymmetric superconductors which have complex magnetic properties. They possess unusual surface states, i.e., states in which electrons can only move along the surface, not into the bulk. For example, there can be a large number of such surface states with vanishing energy, suggested to form a solid-state realization of so-called Majorana fermions. These are particles that form their own antiparticles. The other relevant field is electronic transport through nanometer-size molecules or artificial structures. Here, quantum-mechanical effects lead to behaviors quite distinct from transport at larger scales. This field is also crucial for technological progress in electronics. The objective of the present project is to theoretically study transport through such nanostructures between electrodes made from triplet or noncentrosymmetric superconductors. It is expected that the interplay between the physics of unconventional superconductors on the one hand and quantum effects in transport through nanostructures on the other will lead to novel physics. For example, if many Majorana states are present in the superconducting leads, they will dramatically change the current-voltage characteristics. The goals of this project are to find and to understand such new effects. Complementary theoretical methods appropriate for weak and strong coupling between the nanostructure and the leads will be used to achieve these goals.

在凝聚态物理学的当前兴趣的两个领域结合在这个理论项目。其中之一涉及非常规超导体，特别是所谓的三重态和非中心对称超导体，它们具有复杂的磁性。它们具有不寻常的表面状态，即，电子只能沿着表面移动而不能进入体的状态。例如，可以有大量这样的表面状态与消失的能量，建议形成一个固态实现所谓的马约拉纳费米子。这些粒子可以形成自己的反粒子。另一个相关领域是通过纳米尺寸分子或人工结构的电子传输。在这里，量子力学效应导致的行为与大尺度下的输运截然不同。这一领域对电子技术进步也至关重要。本项目的目标是从理论上研究通过这种纳米结构的三重态或非中心对称超导体制成的电极之间的输运。预计非常规超导体物理学与纳米结构传输中的量子效应之间的相互作用将导致新的物理学。例如，如果超导导线中存在许多马约拉纳态，它们将显著改变电流-电压特性。这个项目的目标是发现和理解这些新的影响。互补的理论方法适用于弱耦合和强耦合之间的纳米结构和引线将被用来实现这些目标。