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Dynamic Rashba-Dresselhaus Effect.

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Lattice vibrations can induce dynamic Rashba-Dresselhaus spin splitting in nonmagnetic crystals. Electron-phonon interactions enable phonon-assisted spin textures, controllable via infrared-active phonons.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • The Rashba-Dresselhaus effect describes spin splitting in semiconductors, leading to spin textures and spin-momentum locking.
  • In centrosymmetric nonmagnetic crystals, this bulk effect is typically forbidden by symmetry.
  • Lattice vibrations (phonons) are known to influence electronic properties.

Purpose of the Study:

  • To investigate the modification of the Rashba-Dresselhaus effect by lattice vibrations.
  • To explore the induction of dynamic spin splitting in symmetry-forbidden systems via electron-phonon interactions.
  • To demonstrate selective control over different spin textures (Rashba, Dresselhaus, Weyl) using coherent phonons.

Main Methods:

  • Theoretical investigation of electron-phonon interactions in centrosymmetric nonmagnetic crystals.
  • Analysis of out-of-equilibrium phonon populations.
  • Ab initio calculations to quantify the effect in halide perovskites.

Main Results:

  • Electron-phonon interactions can induce a dynamic Rashba-Dresselhaus spin splitting when phonons are out of equilibrium.
  • This phonon-assisted spin splitting occurs even in systems where the bulk effect is symmetry-forbidden.
  • Driving coherent infrared-active phonons allows for the selective establishment of Rashba, Dresselhaus, or Weyl spin textures.

Conclusions:

  • Lattice vibrations offer a novel pathway to engineer spin textures in nonmagnetic materials.
  • Phonon-driven spintronics provides a new mechanism for controlling spin properties dynamically.
  • The findings are quantified for halide perovskites, suggesting potential applications in spintronic devices.