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SUMMARY:Field-induced Multi-Q⃗ States in a Pyrochlore Heisenberg Magnet 
 - Cecilie Glittum (Helmholtz-Zentum Berlin)
DTSTART:20250327T140000Z
DTEND:20250327T153000Z
UID:TALK227737@talks.cam.ac.uk
CONTACT:Bo Peng
DESCRIPTION:In this talk\, I will present a recent work on the J1-J3b clas
 sical Heisenberg model on the pyrochlore lattice in the presence of a magn
 etic field. We construct exact ground states of the model\, which are non-
 coplanar multi-Q⃗ spin configurations with a large magnetic unit cell. U
 sing linear spin wave theory\, we show that entropy favours these multi-Q
 ⃗ states at low temperatures in high magnetic fields. This is confirmed 
 by Monte Carlo simulations\, which we also use to map out a phase diagram.
  Lastly\, we calculate the zero-temperature dynamical structure factor. Be
 sides the usual Goldstone modes associated with the ordering Q⃗s\, we fi
 nd high-intensity gapless modes at momenta where there are no Bragg peaks.
LOCATION:TCM Seminar Room
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