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

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Topological spin textures in electronic non-Hermitian systems.

Xiao-Xiao Zhang¹, Naoto Nagaosa²

¹RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan.

Science Bulletin

|December 21, 2023

Summary

This summary is machine-generated.

This study reveals exotic spin textures in topological insulators, driven by non-Hermitian physics. These findings open new solid-state avenues for manipulating spin patterns using advanced spectroscopy.

Keywords:

ARPES Magnetic impurity Non-Hermitian system Surface state Topological spin texture

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Area of Science:

Condensed Matter Physics
Quantum Mechanics

Background:

Non-Hermitian systems are typically studied in open or nonequilibrium scenarios.
Experimental advances have largely utilized optical, cold-atomic, and classical platforms.
Solid-state electronic systems in equilibrium offer a highly desired, yet underexplored, platform for non-Hermitian physics.

Purpose of the Study:

To investigate non-Hermitian phenomena in equilibrium solid-state systems.
To demonstrate the emergence of topological soliton spin textures in topological insulators.
To explore the spectroscopic detection and tunability of these spin patterns.

Main Methods:

Theoretical investigation of topological insulators with magnetic impurities.
Analysis of spin-dependent relaxation as a source of non-Hermiticity.
Utilizing spin- and angle-resolved photoemission spectroscopy (SARP) for detection.

Main Results:

Discovery of nontrivial topological soliton spin textures in the momentum space of topological insulator surface states.
Established a link between spin-channel phenomena, non-Hermiticity type, and robust spectroscopic signatures.
Demonstrated the interconversion of topological soliton objects via magnetic doping-induced transitions.

Conclusions:

Opens a solid-state pathway to engineer exotic spin patterns using non-Hermitian physics.
Highlights the potential of spin- and angle-resolved photoemission spectroscopy for detecting these phenomena.
Inspires future research in non-Hermitian dissipation engineering of spins in solid materials.