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UID:DSC-19317
DTSTART;TZID=Europe/Berlin:20221206T145000
SEQUENCE:1670308703
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20221206T162000
URL:https://dresden-science-calendar.de/calendar/en/detail/19317
LOCATION:TUD\,    
SUMMARY:Shimizu: Phase degree of freedom and topological properties in mult
 iple-Q spin textures
CLASS:PUBLIC
DESCRIPTION:Speaker: Kotaru Shimizu\nInstitute of Speaker: University of To
 kyo\nTopics:\nPhysik\n Location:\n  Name: TUD ()\n  Street:   \n  City:  \
 n  Phone: \n  Fax: \nDescription: <p><strong>Abstract:</strong></p>  <p>To
 pological spin textures\, such as two-dimensional skyrmion lattices (SkLs)
  and three-dimensional hedgehog lattices (HLs) are approximately represent
 ed by superpositions of multiple spin-density waves\, and hence\, called m
 ultiple-Q spin textures. In such spin structures\, the phase degree of fre
 edom of the superposed waves plays an important role in the topological pr
 operties as well as the symmetry of the magnetic textures [1\,2]\, but no
  systematic investigation has been performed thus far. In this study\, we 
 theoretically investigate the evolution of magnetic and topological proper
 ties in SkLs composed of three spin density waves (3Q-SkL) and HLs compose
 d of four spin density waves (4Q-HL) while changing the phases as well as 
 the magnetization [3]. By introducing a hyperspace to deal with the phase
  degree of freedom systematically\, we find that the 3Q-SkLs change their 
 skyrmion number among –2\, –1\, 0\, 1\, and 2 depending on the phase a
 nd magnetization. In the case of the 4Q-HLs\, we obtain richer phase diagr
 ams where the density and configuration of topological objects called hedg
 ehogs and antihedgehogs change in a wide range. Our results of the complet
 e phase diagrams for the phase shift provide good references to discuss ho
 w the actual systems experience magnetic and topological transitions in an
  applied magnetic field.</p>  <p>[1] T. Kurumaji et al.\, Science <strong>
 365</strong>\, 914 (2019).<br /> [2] S. Hayami\, T. Okubo\, and Y. Motome\
 , Nat. Commun. <strong>12</strong>\, 6927 (2021).<br /> [3] K. Shimizu et 
 al.\, Phys. Rev. B <strong>105</strong>\, 224405 (2022).</p>  <p><strong>B
 igBlueButton:</strong><br /> https://selfservice.zih.tu-dresden.de/l/link.
 php?m=188424&amp\;p=0980aaee (https://selfservice.zih.tu-dresden.de/l/link
 .php?m=188424&amp\;p=0980aaee) (TUD)<br /> https://selfservice.zih.tu-dres
 den.de/link.php?m=188424&amp\;p=7ce5f443 (https://selfservice.zih.tu-dresd
 en.de/link.php?m=188424&amp\;p=7ce5f443) (External)</p>
DTSTAMP:20260614T165426Z
CREATED:20221203T063856Z
LAST-MODIFIED:20221206T063823Z
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