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Related Experiment Video

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

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Published on: June 28, 2018

High spin axion insulator.

Shuai Li^1,2, Ming Gong³, Yu-Hang Li⁴

¹School of Physical Science and Technology, Soochow University, Suzhou, 215006, China.

Nature Communications

|May 18, 2024

Summary

This summary is machine-generated.

We introduce high-spin axion insulators (HSAIs), a novel material class with tunable topological properties. These materials offer new avenues for quantum computing and layertronics applications.

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Area of Science:

Condensed Matter Physics
Quantum Materials

Background:

Axion insulators exhibit quantized axion fields (θ = π) protected by lattice and time-reversal symmetry.
These materials hold significant promise for advanced applications in layertronics and quantum computing.

Purpose of the Study:

To propose and theoretically investigate a novel class of materials: high-spin axion insulators (HSAIs).
To explore the unique properties and potential applications of HSAIs, particularly their tunable topological characteristics.

Main Methods:

Theoretical proposal of HSAIs in a large spin-s representation, yielding θ = (s + 1/2)²π.
Confirmation of the axion field via hybrid Wannier functions, layer-resolved Chern numbers, and topological magnetoelectric effect calculations.
Investigation of boundary properties and the impact of external magnetic fields on transport.

Main Results:

HSAIs exhibit a distinct axion field tunable by spin-s and external magnetic fields.
Absence of gapless boundary excitations despite integer surface Chern number, indicating a quantum anomaly.
Demonstrated tunability of bonded transport properties through external magnetic fields.

Conclusions:

HSAIs represent a new frontier in topological materials, expanding the understanding of axion insulators.
The tunable nature and unique quantum anomaly of HSAIs pave the way for novel device applications.
Experimental verification in ultra-cold atoms is proposed, highlighting quantized non-reciprocal conductance and topological magnetoelectric response.