Majorana Modes in Topological Superconductors|蔻享学术

The Kavli ITS workshop on “Majorana Modes in Topological Superconductors” will be held at the Kavli Institute for Theoretical Sciences (Kavli ITS) at UCAS in Beijing from January 8-11, 2019. The workshop mainly focuses on the realization and application of elusive Majorana modes in topological superconductors.

Majorana particles, which are their own antiparticles, have been of considerable interest for quantum computing in solid state systems since the zero-bias peak of the conductance was observed in the semiconductor nanowires. Now there are multiple experimental hints to support the potential existence of the Majorana states possessing zero energy. Since Majorana states can form qubits for quantum computation, once the Majorana states are able to be fully controlled and manipulated, the number of the Majorana qubits can be scalable to accelerate the speed of the quantum computation.

The scope of this workshop is to discuss the recent topics in Majorana bound states and Chiral Majorana edge modes in class D, aiming at promoting new collaborations among participants and seeking practical implementations to use Majorana modes for quantum computation. Furthermore, in the workshop, there will be a discussion session focusing on Majorana physics in the vortices of the topological superconductors.

图|Roland Wiesendanger 教授

题目：Emergence of Majorana States in Atomic-scale Hybrid Systems

报告人：Roland Wiesendanger

单位：University of Hamburg

地点：中国-北京

时间：2019年1月8日-11日

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报告简介

Majorana states in atomic-scale magnet-superconductor hybrid systems have recently become of great interest because they can encode topological qubits and ultimately provide a new direction in topological quantum computation.

First, it will be demonstrated how well defined 1D atomic chains of magnetic adatoms on  superconducting substrates with high spin-orbit coupling can be artificially fabricated using STM-based atom-manipulation techniques. Spin polarized STM measure-ments allow revealing the presence of non-collinear spin textures, i.e. spin spiral ground states, stabilized by interfacial Dzyaloshinskii-Moriya interactions. Simultaneously performed scanning tunneling spectroscopy on the magnetic atom chains on the superconductor substrate reveal the evolution of the spatially and energetically resolved local density of states as well as the emergence ofzero-energy bound states at the chain ends above a critical chain length. Based on the exact knowledge of the geometrical, electronic, and spin structure ofthe magnetic chain – superconductor hybrid system, the experimental results canbe compared rigorously with ab-initio and model-type tight-binding calculations supporting the interpretation of the spectroscopic signatures at the ends ofthe chains as Majorana bound states. More recently, the atomic-scale designof more complex network structures for Majorana state manipulation, including braiding operations has been in the focus of our research.

Second, we will address experimental and theoretical studies of monolayer topological superconductivity and chiral Majorana edge modes in model-type 2D magnetic islands on elemental superconductors. In particular, we demonstrate that interface engineeringby an atomically thin oxide layer is crucial for driving the studied hybridsystem into a topologically non-trivial state as confirmed by theoretical calculations of the topological invariant, the Chern number.

Finally, the prospects for studies of Majorana statesin skyrmion – superconductor hybrid systems will be highlighted.

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个人简介

Roland Wiesendanger, 汉堡大学物理系教授。

His research activities are concentrated on nanometer-scale science and technology based on scanning probe methods (SPM). In particular, His in­ves­ti­ga­te the fundamental relationship between nanostructure and nanophysical properties. His apply scanning tunneling microscopy (STM), atomic force microscopy (AFM), magnetic force microscopy (MFM) and other scanning probe methods (SXM) to various classes of materials, including metals, semi­con­duc­tors, insulators, super-conductors, magnetic materials, molecular thin films, and biological systems. Laterally nanostructured materials are obtained by using SPM-based nanofabrication processes, which may be based on strong mechanical, electronical or magnetic interaction between probe tip and sample, as well as by using self-organization phenomena. Future nano-scale devices and ultrahigh density data storage systems are being developed in close collaboration with industry.

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