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Study of Protein Dynamics via Neutron Spin Echo Spectroscopy
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Exceptional points in classical spin dynamics.

Alexey Galda1,2, Valerii M Vinokur3

  • 1James Franck Institute, University of Chicago, Chicago, IL, 60637, USA. agalda@uchicago.edu.

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|November 27, 2019
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Summary
This summary is machine-generated.

Researchers harnessed exceptional points (EPs) in non-conservative systems to achieve non-reciprocal spin transmission. This breakthrough enables efficient asymmetric spin filtering for advanced spintronics and magnonics applications.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics
  • Spintronics
  • Photonics

Background:

  • Non-conservative physical systems exhibit spectral degeneracy at exceptional points (EPs) where eigenvalues and eigenvectors coalesce.
  • Dynamical encircling of EPs in open dissipative systems has been explored in optics and photonics, leading to state flips.
  • Parity-time (PT)-symmetric dynamics in spin systems are an active area of research.

Purpose of the Study:

  • To utilize the topological properties of EPs for chiral non-reciprocal spin transmission.
  • To implement an efficient asymmetric spin filter using non-reciprocal spin dynamics.
  • To explore the potential of EPs in spintronics and magnonics.

Main Methods:

  • Modeling a spin-torque-driven single spin system with a time-dependent non-Hermitian Hamiltonian.
  • Analyzing the dynamical parametric encircling of individual EPs in parameter space.
  • Investigating the resulting non-reciprocal spin dynamics and identifying optimal protocol parameters.

Main Results:

  • Demonstrated that encircling EPs leads to non-reciprocal spin dynamics.
  • Identified optimal parameters for a high-efficiency asymmetric spin filter.
  • Showcased the potential for chiral spin transmission through materials with non-uniform magnetization.

Conclusions:

  • Exceptional points offer a novel platform for achieving non-reciprocal spin transmission.
  • The proposed method provides a route towards efficient asymmetric spin filters.
  • Findings pave the way for new non-reciprocal spin devices in spintronics and magnonics.