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Related Experiment Video

Updated: May 9, 2025

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

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Published on: June 28, 2018

Experimental Observation of Dirac Exceptional Points.

Yang Wu^1,2, Dongfanghao Zhu^1,2, Yunhan Wang^1,2,3

¹University of Science and Technology of China, CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, Hefei 230026, China.

Physical Review Letters

|May 2, 2025

Summary

Researchers discovered a new type of exceptional point (EP), the Dirac EP, in diamond. This finding advances understanding of non-Hermitian systems and quantum control applications.

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Area of Science:

Quantum physics
Condensed matter physics
Materials science

Background:

Exceptional points (EPs) are crucial degeneracies in energy levels, vital for understanding material phenomena and device functionalities.
Only two types of EPs have been experimentally observed, leading to discoveries of Dirac and Weyl semimetals with unique topological properties.

Purpose of the Study:

To report the observation of a novel type of exceptional point, termed the Dirac EP.
To explore the properties and implications of this new EP in non-Hermitian systems.

Main Methods:

Utilizing a nitrogen-vacancy center in diamond to create and study the Dirac EP.
Measuring degenerate eigenvalues at the Dirac EP.
Employing quantum state tomography to examine eigenstate degeneracy and confirm the Dirac EP.

Main Results:

Observation of a novel Dirac EP in a nitrogen-vacancy center in diamond.
Eigenvalues were found to be degenerate and remain real near the Dirac EP.
The Dirac EP exhibits exotic band topology, preserving symmetry and enabling adiabatic evolution in non-Hermitian systems.
Quantum state tomography confirmed the degeneracy as a Dirac EP, distinct from Hermitian degeneracy.

Conclusions:

The discovery of the Dirac EP offers a new perspective on dynamics within non-Hermitian systems.
This finding has potential applications in quantum control and the study of topological properties of EPs.