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Third-order exceptional line in a nitrogen-vacancy spin system.

Yang Wu1,2, Yunhan Wang1,2, Xiangyu Ye1,2

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

Nature Nanotechnology
|January 15, 2024
PubMed
Summary
This summary is machine-generated.

Researchers observed a third-order exceptional line in an atomic system using a nitrogen-vacancy spin in diamond. This breakthrough enables exploration of high-order exceptional points and their topological physics for quantum technologies.

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Area of Science:

  • Quantum Physics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Exceptional points (EPs) are critical points in non-Hermitian systems where eigenvalues and eigenstates merge.
  • High-order EPs offer enhanced topological properties and sensing capabilities compared to second-order EPs.
  • Theoretical models predict complex topological phases associated with high-order EP geometries like lines and rings.

Purpose of the Study:

  • To experimentally observe high-order exceptional point geometries.
  • To investigate the role of symmetries in realizing complex EP structures.
  • To explore potential applications in quantum technologies.

Main Methods:

  • Utilized a nitrogen-vacancy (NV) spin in diamond as an atomic-scale platform.
  • Engineered a non-Hermitian Hamiltonian by introducing multiple symmetries.
  • Observed a third-order exceptional line within the engineered system.

Main Results:

  • Successfully demonstrated a third-order exceptional line, a complex high-order EP geometry.
  • Established the crucial role of introduced symmetries in the formation of high-order EP geometries.
  • Validated the NV spin system as a viable platform for studying atomic-scale topological physics.

Conclusions:

  • The experimental observation of a third-order exceptional line marks a significant advancement in understanding non-Hermitian physics.
  • The findings highlight the importance of symmetry in controlling and realizing complex exceptional point structures.
  • This work paves the way for future investigations into high-order EP-related topological physics and quantum technologies at the atomic scale.