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SUMMARY:Light-induced vortex matter from transient domain walls in ultrafa
 st experiments
DTSTART:20260908T020000Z
DTEND:20260908T030000Z
DTSTAMP:20260925T102600Z
UID:indico-event-5272@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Lingxian Kong (孔令贤) (KTH Royal Institute of Te
 chnology)\n\nHost: Prof. Vadim Grinenko  \nVenue: TDLI Meeting Room N40
 0\nTencent Meeting link:  https://meeting.tencent.com/dm/vrsm5QXAp6DZ\nMe
 eting ID: 229842433\, no password\n \n \nAbstract:\nIn ultrafast experim
 ents\, an optical pump pulse often generates transient domain walls of the
  order parameter in materials with spontaneous symmetry breaking\, due to 
 either a finite penetration depth of light on a three-dimensional (3D) mat
 erial\, or a finite spot size on a two-dimensional (2D) material. We show 
 that the domain wall decays due to unstable order parameter fluctuations. 
 We study a generic system with U(1)-symmetric order\, and those with an ad
 ditional weak Z2 (U(1)-symmetry-breaking) term\, representing the charge-d
 ensity-wave (CDW) orders in recent experiments. During the first stage of 
 the decay dynamics\, exponentially growing thermal fluctuations convert th
 e domain wall into an interface with randomly distributed topological defe
 cts. In the second stage\, the topological defects undergo a coarsening dy
 namics within the interface. For a 2D interface in a 3D system\, the coars
 ening dynamics leads to a diffusive growth of the correlation length. For 
 a one-dimensional (1D) interface in a 2D system with the weak Z2 term\, th
 e correlation-length growth shows a crossover from diffusive to sub-diffus
 ive behavior.\n \nBiography:\nLingxian Kong is currently a postdoctoral r
 esearcher in the Division of Condensed Matter Theory at KTH Royal Institut
 e of Technology. He received his Ph.D. from Peking University in 2025 and 
 his bachelor’s degree from Shanghai Jiao Tong University in 2020. His re
 search focuses on the collective dynamics of many-body systems\, including
  the equilibrium and nonequilibrium dynamics of exciton condensates\, mult
 icomponent superconductors\, and related systems.\n\nhttps://indico-tdli.s
 jtu.edu.cn/event/5272/
LOCATION:Tsung-Dao Lee Institute/N6F-N600 - Lecture Room (Tsung-Dao Lee In
 stitute)
URL:https://indico-tdli.sjtu.edu.cn/event/5272/
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