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Phonon Angular Momentum Hall Effect.

Sungjoon Park1,2,3, Bohm-Jung Yang1,2,3

  • 1Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 08826, Korea.

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|September 21, 2020
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Summary
This summary is machine-generated.

A temperature gradient can create a transverse flow of phonon angular momentum (PAM), known as the phonon angular momentum Hall effect (PAMHE). This effect leads to edge magnetization in crystals, offering a new avenue for spin manipulation.

Keywords:
Hall effectPhonon angular momentumphonon magnetic momentthermal transport

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Area of Science:

  • Condensed matter physics
  • Spintronics
  • Materials science

Background:

  • The spin Hall effect describes transverse electron spin flow due to electric fields.
  • Magnon spin flow, driven by temperature gradients, offers thermal spin manipulation.
  • Phonon angular momentum (PAM) is analogous to magnon spin, representing atomic orbital motion.

Purpose of the Study:

  • To investigate the induction of transverse PAM flow by temperature gradients.
  • To introduce and define the phonon angular momentum Hall effect (PAMHE).
  • To explore the consequences of PAMHE, including edge magnetization.

Main Methods:

  • Theoretical analysis of phonon dynamics under thermal gradients.
  • Identification of conditions for PAMHE (transverse and longitudinal acoustic phonons).
  • Investigation of PAM accumulation at crystal edges.

Main Results:

  • Demonstrated that temperature gradients generally induce a transverse PAM flow (PAMHE).
  • Established that PAMHE is ubiquitous in condensed matter systems with acoustic phonons.
  • Showed that edge PAM induces observable edge magnetization in crystals with non-zero Born effective charge.

Conclusions:

  • The phonon angular momentum Hall effect (PAMHE) is a general phenomenon driven by temperature gradients.
  • PAMHE provides a novel mechanism for spin accumulation and potential for optical detection of magnetization.
  • This discovery opens new possibilities for thermal control of spin properties in materials.