P10 (Scheer): Spatially-resolved transport spectroscopy of quantum matter

P10 (Scheer)：量子物质的空间分辨输运光谱

• 批准号: 493158779
• 负责人: Professorin Dr. Elke Scheer
• 金额: --
• 依托单位: Arbeitsgruppe Mesoskopische Systeme
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/493158779?language=en
• 关键词: P10; Scheer; Spatially; resolved; transport

Hybrid devices of superconductor{ferromagnet (SC-FM) hybrid systems may support Cooper pairs with unconventional symmetry giving rise to long-ranged, spin polarized supercurrents (SPSC) through the ferromagnet. On the other hand, these systems may host Andreev bound states (ABS) or Majorana bound states (MBS). SPSC and MBS may be used in correlated quantum information technology for dissipationless information transfer by virtue of their entangled and coherent nature. However, the conditions to reliably create and detect MBS with these hybrid devices are still not settled, because details of the interface may play a crucial role and because the identification of MBS and distinguishing them from ABS solely by transport experiments is still a challenge. We hypothesize that knowing the spectral properties of low-energy excitations and their correlations and entanglement in highly-correlated quantum materials like Kondo systems close to a quantum critical point or high-Tc superconductors, is mandatory to leverage their potential for applications in solid state quantum systems. The central goal of this project part is to develop a route for detecting electronic correlations by combining scanning tunneling spectroscopy with electronic transport measurements. This project part complements the palette of detection techniques for these exotic electronic states, investigated throughout the whole SFB, by a local probe. It seeks to establish a correlation between the spatial dependence of the local density of states and current-voltage characteristics of devices made of unconventional material combinations. In particular we want to develop a scheme for distinguishing between MBS and ABS, identifying systems which may host long-ranged SPSCs, detect unconventional superconducting order parameter symmetries, contribute to the development of a Cooper pair splitter and to reveal the spatio-spectroscopic signatures of Kondo correlations.

超导体{铁磁体（SC-FM）混合系统的混合装置可支持具有非常规对称性的库珀对，从而产生通过铁磁体的长程自旋极化超电流（SPSC）。另一方面，这些系统可能存在Andreev束缚态（ABS）或Majorana束缚态（MBS）。由于它们的纠缠和相干性质，可以将它们应用于相关量子信息技术中，实现无耗散的信息传输。然而，用这些混合设备可靠地创建和检测MBS的条件仍然没有解决，因为接口的细节可能起着至关重要的作用，并且因为仅通过传输实验识别MBS并将其与ABS区分开来仍然是一个挑战。我们假设，了解低能量激发的光谱特性及其在接近量子临界点或高Tc超导体的高相关量子材料（如近藤系统）中的相关性和纠缠性，对于利用其在固态量子系统中的应用潜力是强制性的。这个项目的中心目标是开发一种结合扫描隧道光谱和电子输运测量来检测电子相关性的方法。该项目的一部分补充了这些外来的电子状态的检测技术的调色板，在整个SFB调查，由本地探针。它试图建立一个非常规材料组合制成的器件的局部态密度和电流-电压特性的空间依赖性之间的相关性。特别是，我们要开发一个计划，区分MBS和ABS，识别系统，可能主机远程SPSC，检测非常规的超导序参数对称性，有助于发展的库珀对分裂器，并揭示近藤相关的空间光谱签名。