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Protecting a single solid-state spin from a spin bath in diamond for quantum sensing

保护单个固态自旋免受金刚石自旋浴的影响，用于量子传感

基本信息

批准号：
18F18023
负责人：
NORI FRANCO
金额：
$ 1.47万
依托单位：
Institute of Physical and Chemical Research
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2018
资助国家：
日本
起止时间：
2018-04-25 至 2020-03-31
项目状态：
已结题

项目摘要

In FY2018, my research is mainly focused on the following two topics: (1) Majorana corner states in a 2D magnetic topological insulator on a high-temperature superconductor. A d-dimensional second-order topological superconductor (TSC) is characterized by topologically protected gapless (d-2) dimensional states with the usual gapped (d - 1) boundaries. In this work, we studied a second-order TSC with a 2D magnetic topological insulator proximity coupled to a high-temperature superconductor, where Majorana bound states (MBSs) are localized at the corners of a square sample with gapped edge modes. A detailed analysis, based on edge theory, revealed the origin of the existence of MBSs at the corners of the 2D sample, which results from the sign change of the Dirac mass emerging at the intersection of any two adjacent edges due to pairing symmetry. (2) Second-order topological phases in non-Hermitian systems. A d-dimensional second-order topological insulator (SOTI) can host topologically protected (d-2)-dimensional gapless boundary modes. In this work, we showed that a 2D non-Hermitian SOTI can host zero-energy modes localized only at one corner. A 3D non-Hermitian SOTI is shown to support second-order boundary modes localized not along hinges but anomalously at a corner. The usual bulk-corner (hinge) correspondence in the second-order 2D (3D) non-Hermitian system breaks down.

2018财年，我的研究主要集中在以下两个主题：（1）高温超导体上二维磁性拓扑绝缘体中的马约拉纳角态。d维二阶拓扑超导体（TSC）的特征是具有通常的带隙（d - 1）边界的拓扑保护的无隙（d-2）维态。在这项工作中，我们研究了一个二阶TSC与二维磁拓扑绝缘体接近耦合到高温超导体，其中马约拉纳束缚态（MBSs）是本地化的角落的正方形样品与带隙的边缘模式。基于边缘理论的详细分析揭示了2D样品角落处存在MBSs的起源，这是由于配对对称性导致任何两个相邻边缘相交处出现的狄拉克质量的符号变化。(2)非厄米特系统中的二阶拓扑相。d维二阶拓扑绝缘体（SOTI）可以具有拓扑保护的（d-2）维无隙边界模。在这项工作中，我们表明，一个二维非厄米SOTI可以主机零能量模式仅局限于一个角落。一个3D非厄米SOTI示出支持本地化的二阶边界模式，而不是沿着铰链，但在一个角落里。在二阶2D（3D）非厄米系统中，通常的体角（铰链）对应被打破。