BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Topological defects in spiral spin liquids - Han Yan\, University 
 of Tokyo
DTSTART:20240522T130000Z
DTEND:20240522T140000Z
UID:TALK217036@talks.cam.ac.uk
CONTACT:Gaurav
DESCRIPTION:In this talk we will discuss a new type of topolgoical defects
  — momentum vortices — in spiral spin liquids and recent experimental 
 identification of them. Spiral spin liquids are a class of spin liquids th
 at feature a ring degeneracy of its ground states in momentum space. Over 
 the years\, a concrete physical picture of its spin liquid nature has not 
 been established\, considering that its zero-temperature ground states do 
 not admit any local degeneracy. We illustrate the low-energy structure of 
 2D spiral spin liquids\, and reveal its connection to fracton and smectic 
 physics. We find that the local momentum vector can form new types of mome
 ntum vortices in the system\, which have very different properties from th
 e commonly known spin vortices [1]. Their proliferation leads the system i
 nto the spin liquid phase at low temperature. Furthermore\, the effective 
 theory shows that these objects are equivalent to quadrupoles of fractons 
 in rank-2 U(1) gauge theory and also topological defects in smectic matter
 . I will also discuss related materials [2] and recent experimental identi
 fication of the momentum vortices [3]. \n\n[1] H. Yan and J. Reuther\, Low
  energy structure of spiral spin liquids\, Phys. Rev. Research 4\, 023175 
 (2022)\nR. Pohle\, H. Yan and N. Shannon\,  Phys. Rev. B 104\, 024426\nM. 
 Gonzalez et al.\, arXiv: 2404.00100\n[2] S. Gao et al.\, Spiral spin-liqui
 d on a honeycomb lattice\, Phys. Rev. Lett. 128\, 227201\nC. Balz et al.\,
  Nat. Phys. 12\, 942–949 (2016).\n[3] Spiral Spin Liquid Noise\, arXiv:2
 405.02075
LOCATION:TCM Seminar Room
END:VEVENT
END:VCALENDAR