Southern University of Science and Technology's Quantum Singularity Laboratory Makes Breakthrough in Chiral Kagome Superconducting Oscillation Research

TapTechNews August 23rd news, the Quantum Singularity and Evolving Matter Laboratory of the Department of Physics at Southern University of Science and Technology released a press release yesterday (August 22nd), observing chiral kagome superconducting oscillations, breaking the world record of the spatial energy resolution of electron spectroscopy (1 μeV).

Project Background

Magnetism and superconductivity are generally considered two mutually exclusive quantum states, but physical giants Matthias and Anderson as early as 1958 considered the association between the two in a lattice frustrated system and proposed the possibility of magnetic superconductivity.

The kagome (kagome) lattice is a pattern composed of triangles with vertices connected to each other, which is a lattice structure with geometric frustration.

Project Team Introduction

This project is led by the research group of Associate Professor Yin Jiaxin of the Department of Physics at Southern University of Science and Technology, and has assembled an international team composed of scholars from China, Switzerland, Germany and Singapore.

Postdoctoral Deng Hanbin of the Department of Physics at Southern University of Science and Technology is the first author of the paper, and Southern University of Science and Technology is the first unit of the paper.

Members of Yin Jiaxin's research group also include Associate Researcher Qin Hailang of the Quantum Center, Postdoctoral Liu Guowei and Yang Tianyu of the Department of Physics at Southern University of Science and Technology.

Project History

Since 2018, Yin Jiaxin and collaborators have reported a series of research results on quantum regulation in kagome magnets and superconductors, promoting a new direction of frontier research: topological kagome materials.

In the review article published in Nature in 2022, Yin Jiaxin et al. pointed out that kagome superconductors can be used as an important carrier to explore magnetic superconductivity and call it magnetically intertwined superconductivity.

Project Introduction

The chiral superconducting energy gap oscillation observed by Yin Jiaxin's team in the kagome superconductors KV3Sb5 and CsV3Sb5 has an oscillation period of 2 × 2; the intensities of the three sets of scattering peaks in the momentum space 2 × 2 are different, and the chirality of the superconducting energy gap oscillation can be defined by the rotation direction from weak to strong.

Through experiments, it is found that the chirality of the superconducting energy gap oscillation can be regulated into clockwise or counterclockwise rotation by the applied external magnetic field. Furthermore, the research team used a superconducting tip to realize a superconducting Josephson tunnel junction to detect the local paired electron density, and observed the chiral oscillation of the paired electron density of 2 × 2.

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