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Angular-Momentum Transfer Mediated by a Vibronic-Bound-State.

Yun-Yi Pai1,2, Claire E Marvinney1, Ganesh Pokharel2

  • 1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|November 10, 2023
PubMed
Summary

Phonons transfer angular momentum to electronic states in NaYbSe2, a quantum spin liquid candidate. This discovery enables optical control of phononic angular momentum using electronic states.

Keywords:
Raman microscopyphonon circularityquantum spin liquidvibronic bound state

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Phononics

Background:

  • Phonons can exhibit pseudo-angular momentum, leading to phenomena like phonon chirality and the phonon Hall effect.
  • Vibronic bound states form when phonons couple to crystal field-split orbital states.

Purpose of the Study:

  • To observe and characterize vibronic bound states in NaYbSe2, a candidate quantum spin liquid.
  • To investigate the transfer of angular momentum between phonons and electronic systems via these states.

Main Methods:

  • Utilized field and polarization-dependent Raman microscopy.
  • Probed the interaction between phonons and the crystalline electric field in NaYbSe2.

Main Results:

  • Observed a vibronic bound state in the quantum spin liquid candidate NaYbSe2.
  • Demonstrated an angular momentum transfer of ΔJz = ±ℏ between phonons and the crystalline electric field.
  • Showcased the role of the vibronic bound state in mediating this transfer.

Conclusions:

  • The study confirms the transfer of angular momentum between electronic and lattice subsystems in NaYbSe2.
  • This interaction opens new avenues for optical control of phononic angular momentum through electronic states.