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DTSTART:20260329T030000
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DTSTAMP:20260416T205449Z
UID:1765879200@ist.ac.at
DTSTART:20251216T110000
DTEND:20251216T120000
DESCRIPTION:Speaker: Nikola Maksimovic\nhosted by Kimberly Modic\nAbstract:
  Abstract: Strong interactions between particles can give rise to emergen
 t collective excitations. While well-established in electronic systems\, s
 uch behavior is also expected in gases of neutral particles\, like spin wa
 ves (magnons) in a ferromagnet. In the hydrodynamic regime\, strongly inte
 racting magnons can form a slow collective density mode—a magnon sound m
 ode—with distinctive low-frequency signatures. Here\, we isolate atomica
 lly thin ferromagnetic CrCl\, where magnon interactions are strong\, and p
 robe its collective dynamics using quantum sensors based on nearby nitroge
 n-vacancy (NV) centers in diamond. We detect anomalous thermal magnetic fl
 uctuations that grow as temperature decreases\, a signature of increased d
 amping in a low-energy magnon sound mode. Our analysis links this behavior
  to enhanced magnon interactions at higher temperatures\, revealing the on
 set of magnon hydrodynamics. Finally\, we observe spectroscopic evidence o
 f this 2D sound mode under variable-frequency drive\, providing the first 
 experimental glimpse of hydrodynamic magnons and magnon sound.
LOCATION:Heinzel Seminar Room/ Ground Floor/Office Building West\, ISTA
ORGANIZER:Stephanie.Dolot@ist.ac.at
SUMMARY:Nikola Maksimovic: Magnon Hydrodynamics in a layered Magnet
URL:https://talks-calendar.ista.ac.at/events/6140
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