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Interlayer magnetophononic coupling in MnBi2Te4.

Hari Padmanabhan1,2, Maxwell Poore3, Peter K Kim3

  • 1Materials Research Institute and Department of Materials Science & Engineering, Pennsylvania State University, University Park, PA, USA. hari@psu.edu.

Nature Communications
|April 9, 2022
PubMed
Summary
This summary is machine-generated.

We discovered interlayer magnetophononic coupling in MnBi2Te4, a magnetic topological insulator. This coupling allows control over phonons via magnetic fields, crucial for spintronics and quantum information science.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science
  • Spintronics

Background:

  • Quantum materials with emergent magnetism are key for spintronics, magnetic memory, and quantum information.
  • Tunable coupling between spins and other microscopic degrees of freedom is essential for novel functionalities.

Purpose of the Study:

  • To investigate interlayer magnetophononic coupling in the layered magnetic topological insulator MnBi2Te4.
  • To explore the manipulation of spin and phonon interactions in magnetic topological materials.

Main Methods:

  • Magneto-Raman spectroscopy to observe phonon scattering anomalies during magnetic field-driven phase transitions.
  • Density functional theory (DFT) calculations to model the microscopic origins of the observed coupling.
  • Ultrafast spectroscopy to detect coherent phonons and probe coupling in the time domain.

Main Results:

  • Observed anomalies in phonon scattering intensities linked to magnetic phase transitions, indicating magnetophononic coupling.
  • Identified a magnetophononic wave-mixing process enabling excitation of 'forbidden' zone-boundary phonons.
  • DFT model confirmed phonons modulate interlayer exchange coupling.
  • Detected magnetophononic coupling signatures in the time domain via ultrafast coherent phonon experiments.

Conclusions:

  • Evidence for interlayer magnetophononic coupling in MnBi2Te4, a magnetic topological insulator.
  • This coupling arises from phonons modulating interlayer exchange coupling.
  • Magnetophononic coupling offers a pathway for coherent control of magnetic topological phases, vital for future quantum technologies.