Effects of spin-orbit interaction and geometric phases on quantum coherent spin transport and spin manipulations in semiconductor quantum dots and devices

自旋轨道相互作用和几何相位对半导体量子点和器件中量子相干自旋输运和自旋操纵的影响

• 批准号: 40936419
• 负责人: Professor Dr. Gerd Schön
• 金额: --
• 依托单位: Institut für Theoretische Festkörperphysik (TFP)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/40936419?language=en
• 关键词: Effects; spin; orbit; interaction; geometric

We are studying quantum coherent spin manipulations and transport in semiconductor quantum dots, multi-dot systems, wires and other devices under the influence of spin-orbit interaction. In our investigations geometric phases play an important role. For the third funding period we propose to investigate three subprojects: (1) Coherent spin manipulations in quantum dots. Here we will study the quantum coherent dynamics of spins in semiconductor quantum dots coupled to further quan-tum degrees of freedom, exploring analogies to concepts known from quantum optics. (2) Coherent spin-dependent electron transport through quantum dots. We will investigate the influence of the spin-orbit interaction on the Kondo effect. We will also consider systems combining Josephson and spin elements and explore possibilities to manipulate the spin via Josephson circuits. (3) One-dimensional wires with strong spin-orbit coupling. Based on our experience with decoherence of spin qubits protected by time-reversal symmetry we will study the random geometric phases of Majorana qubits.

我们正在研究自旋轨道相互作用影响下半导体量子点、多点系统、导线和其他器件中的量子相干自旋操纵和输运。在我们的调查几何相位起着重要的作用。在第三个资助期内，我们计划研究三个子项目：（1）量子点中的相干自旋操纵。在这里，我们将研究耦合到进一步的量子自由度的半导体量子点中自旋的量子相干动力学，探索与量子光学已知概念的类比。(2)量子点中自旋相关的相干电子输运。我们将研究自旋轨道相互作用对近藤效应的影响。我们也将考虑结合约瑟夫森和自旋元素的系统，并探索通过约瑟夫森电路操纵自旋的可能性。(3)具有强自旋轨道耦合的一维金属丝。基于我们对受时间反演对称性保护的自旋量子比特的退相干的经验，我们将研究马约拉纳量子比特的随机几何相位。