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SUMMARY:“Spin-1 Magnets: a u(3) Formalism”
DTSTART:20230216T161500
DTEND:20230216T171500
DTSTAMP:20260511T074616Z
UID:95044d395b6e951c23b8dae56abf8bd45746f9cf0718a25b085c726f
CATEGORIES:Conferences - Seminars
DESCRIPTION:Kimberly Remund\nSystems based on spin-1 moments exhibit many 
 fascinating\nproperties\, as demonstrated by spin nematics [1\,2]\, Fe-bas
 ed\nsuperconductors [3]\, and cold atom systems [4]. However\, because spi
 n-1\nmoments besides displaying dipoles can also support quadrupoles at\nt
 he level of a single site\, they are not properly described by O(3)\nvecto
 rs\, even in the classical limit.\n\nIn this talk\, we explore a new appro
 ach which correctly describes the\n(semi-)classical physics of spin-1 mome
 nts [5]. This approach\, based on the\nalgebra u(3) [6]\, provides a conv
 enient starting point for Monte Carlo and molecular dynamics\nsimulations\
 , as well as for analytic theory. We benchmark our method\nby applying it 
 to the ferroquadrupolar phase of the spin-1 bilinearbiquadratic\nmodel on 
 the triangular lattice [5]\, reproducing andextending known results [1\,2]
 .\n\nThese results open the prospect of exploring dynamical properties of 
 spin-1\nmagnets which lie outside the spin-wave paradigm\, including spin-
 liquid\nphases\, and the dynamics of topological excitations.\n\n[1] H. Ts
 unetsugu and M. Arikawa\, J. Phys. Soc. Jpn 75\, 083701 (2006)\n[2] A. Lae
 uchli et al\, Phys. Rev. Lett. 97\, 087205 (2006)\n[3] R. M. Fernandes et 
 al.\, Nature Physics 10\, 97 EP (2014)\n[4] E. Demler and F. Zhou\, Phys. 
 Rev. Lett. 88\, 163001 (2002)\n[5] K. Remund et al.\, Phys. Rev. Research 
 4 033106 (2022)\n[6] N. Papanicolaou\, Nuclear Physics B 305\, 367 (1988)
LOCATION:BSP 727 https://plan.epfl.ch/?room==BSP%20727
STATUS:CONFIRMED
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