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Anomalous Thermal Hall Effect in an Insulating van der Waals Magnet

Journal Article · · Physical Review Letters
 [1];  [2];  [3];  [4];  [3];  [5];  [4]
  1. Michigan State Univ., East Lansing, MI (United States); OSTI
  2. Michigan State Univ., East Lansing, MI (United States); Southeast Univ., Nanjing (China)
  3. Carnegie Mellon Univ., Pittsburgh, PA (United States)
  4. Michigan State Univ., East Lansing, MI (United States)
  5. Carnegie Mellon Univ., Pittsburgh, PA (United States); Univ. of Washington, Seattle, WA (United States)

Two-dimensional (2D) van der Waals (vdW) magnets have been a fertile playground for the discovery and exploration of physical phenomena and new physics. In this Letter, we report the observation of an anomalous thermal Hall effect (THE) with κxy ~ 1 × 10-2 WK-1 m-1 in an insulating van der Waals ferromagnet VI3. The thermal Hall signal persists in the absence of an external magnetic field and flips sign upon the switching of the magnetization. In combination with theoretical calculations, we show that VI3 exhibits a dual nature of the THE, i.e., dominated by topological magnons hosted by the ferromagnetic honeycomb lattice at higher temperatures and by phonons induced by the magnon-phonon coupling at lower temperatures. Our results not only position VI3 as the first ferromagnetic system to investigate both anomalous magnon and phonon THEs, but also render it as a potential platform for spintronics-magnonics applications.

Research Organization:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); US Air Force Office of Scientific Research (AFOSR)
Grant/Contract Number:
SC0019259
OSTI ID:
1980238
Alternate ID(s):
OSTI ID: 2573029
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 127; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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