Coherent spin control and geometrical phases in mesoscopic conductors

介观导体中的相干自旋控制和几何相位

• 批准号: 173237693
• 负责人: Professor Dr. Klaus Richter
• 金额: --
• 依托单位: Institut für Theoretische Physik
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/173237693?language=en
• 关键词: Coherent; spin; control; geometrical; phases

We plan to employ quantum transport characteristics, such as weak (anti-)localization, conductance fluctuations and the Aharonov-Bohm effect, as a probe of spin dynamics and associated geometrical phases in confined conductors with complex band topologies. On the one hand, we will consider quantum wires and rings with Rashba- and Dresselhaus spin-orbit coupling and investigate the interplay between confinement and spin relaxation, focusing in the role of the cubic Dresselhaus term. Based on recent work on all-electrical detection of the spin-orbit ratio α/β, we will study α/β-effects on spin coherence, in particular on Aharonov-Casher phases in transport through rings. On the other hand, we propose to develop a semiclassical path-integral approach to the quantum conductance in diffusive and ballistic hole systems, based on four-band models and invoking Berry curvature effects, with the longterm aim to devise semiclassics for topological quantum states in mesoscopic geometries. Both interrelated research lines furthermore aim at making predictions for corresponding experiments to be pursued in the Nitta and Weiss groups. We will use a powerful numerical transport code to check the analytical predictions and to employ realistic models to compare with experiment.

我们计划采用量子输运特性，如弱（反）本地化，电导波动和Aharonov-Bohm效应，作为一个探针的自旋动力学和相关的几何相位在封闭导体复杂的能带拓扑结构。一方面，我们将考虑具有Rashba和Dresselhaus自旋轨道耦合的量子线和环，并研究禁闭和自旋弛豫之间的相互作用，重点关注立方Dresselhaus项的作用。基于最近对自旋轨道比α/β的全电探测工作，我们将研究α/β对自旋相干性的影响，特别是对通过环输运的Aharonov-Casher相的影响。另一方面，我们提出了一个半经典路径积分方法的量子电导的扩散和弹道孔系统的基础上，四带模型和调用Berry曲率效应，与长期的目标是设计半经典的拓扑量子态在介观几何。此外，这两个相互关联的研究路线旨在为Nitta和韦斯小组进行的相应实验做出预测。我们将使用一个强大的数值传输代码来检查的分析预测，并采用现实的模型与实验进行比较。

项目成果

Magnetotransport in disordered two-dimensional topological insulators: signatures of charge puddles

• DOI: 10.1088/2053-1583/2/2/024005
• 发表时间: 2015-02
• 期刊: 2D Materials
• 影响因子: 5.5
• 作者: S. Essert;K. Richter

Probing the band topology of mercury telluride through weak localization and antilocalization

通过弱局域化和反局域化探测碲化汞的能带拓扑

• DOI: 10.1088/0268-1242/27/12/124006
• 发表时间: 2012
• 期刊: Semiconductor Science and Technology
• 影响因子: 1.9
• 作者: V. Krueckl;K. Richter
• 通讯作者: K. Richter

Weak localization in mesoscopic hole transport: berry phases and classical correlations.

介观空穴传输的弱定位：浆果相和经典相关性

• DOI: 10.1103/physrevlett.106.146801
• 发表时间: 2011
• 期刊: Physical review letters
• 影响因子: 8.6
• 作者: V. Krueckl;M. Wimmer;I. Adagideli;J. Kuipers;K. Richter
• 通讯作者: K. Richter

Using topological insulator proximity to generate perfectly conducting channels in materials without topological protection

• DOI: 10.1088/1367-2630/16/11/113058
• 发表时间: 2014-11-24
• 期刊: NEW JOURNAL OF PHYSICS
• 影响因子: 3.3
• 作者: Essert, Sven;Krueckl, Viktor;Richter, Klaus
• 通讯作者: Richter, Klaus

The ABC of Aharonov Effects

阿哈罗诺夫效应的基本知识

• DOI: 10.1103/physics.5.22
• 发表时间: 2012
• 期刊: Physics
• 影响因子: 1.6
• 作者: K. Richter