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SUMMARY:Quantum Hamiltonian time crystals from covariant quantum Landau--L
 ifshitz--Gilbert relaxation
DTSTART:20261030T023000Z
DTEND:20261030T033000Z
DTSTAMP:20261105T163200Z
UID:indico-event-5401@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Antti Niemi (Nordita\, Stockholm University\, Sweden
  And Wilczek Quantum Center\, University of Science and Technology of Chin
 a)\n\nHost: Prof. Qingdong Jiang  \nVenue: TDLI Meeting Room N600\nTence
 nt Meeting link: https://meeting.tencent.com/dm/TuJBy5bu7Cr7\nMeeting ID:
  421947731\, no password\n \nAbstract:\nClassical Hamiltonian time crysta
 ls are constrained energy minima that are not critical points of the Hamil
 tonian.They move periodically along symmetry orbits\, with frequencies set
  by the Lagrange multipliers enforcing fixed charge values. We construct t
 heir quantum counterparts by minimizing the energy over density matrices w
 ith fixed spectrum and charge expectations. A symmetry-covariant quantum L
 andau--Lifshitz--Gilbert equation can select moving energy minima as perio
 dic attractors by damping motion relative to the symmetry orbit. The flow 
 preserves the spectrum and charge expectations while decreasing the energy
  and determining the multipliers dynamically. At the attractor\, the dampi
 ng vanishes while the Hamiltonian motion persists. A chiral spin-trimer mo
 del motivated by $\\mathrm{Cu}_3$ molecular magnets exhibits this motion t
 hrough periodic two-spin correlations\, with vanishing local and total spi
 n magnetization and no Zeeman term.\n \nBiography:\nAntti Niemi received 
 his PhD from MIT in 1983. He then moved to the Institute for Advanced Stud
 y in Princeton and in 1985 he became Assistant Professor at the Ohio State
  University and Visiting Professor at UC Berkeley. In 1988 he moved to CER
 N Theory Division. In 1989 he started as Group Leader at Research Institut
 e for Theoretical Physics at Helsinki University\, and in 1990 as the Foun
 ding Director of Institute of Particle Physics at Aalto University\; both 
 are now part of Helsinki Institute of Physics. Since 1992 he has been Chai
 red Professor of theoretical physics at Uppsala University\, since 2005 he
  has been Directeur de Recherche (DR1) at CNRS\, and since 2017 he has bee
 n at Nordita. He has also held several visiting professorships including B
 razil\, Canada\, Finland\, Russia and China\, where he advises PhD student
 s in Tianjin and Beijing\, and in Shanghai he is a Founding Member of the 
 Wilczek Quantum Center.\nAntti worked several years on quantum field and s
 tring theory. He extended the Parisi-Sourlas supersymmetry\, invented the 
 parity anomaly\, applied topological techniques to fermion fractionization
 \, developed diagrammatic rules for relativistic finite temperature quantu
 m field theories and pioneered the use of path integral localization in qu
 antum field theory. In a long and extended collaboration with Ludvig Fadde
 ev he introduced the concept of knotted solitons\, and field decomposition
  techniques in Yang-Mills theories. Subsequently his interests moved to bi
 ological physics where he develops geometrical and topological methods wit
 h applications to protein folding and dynamics. His present interests incl
 ude also time crystals and their potential use from magnetic materials and
  cold atom Bose-Einstein condensates to models of molecular motors.\nAntti
  coordinates the activities of the research group of Frank Wilczek at Stoc
 kholm University\, including the organization of the Quantum Connections s
 eries of workshops and summer schools. Antti has received the Outstanding 
 Junior Investigator grant of DOE\, the Goran Gustafsson Prize of KVA\, and
  both the Changjiang and Thousand Talent awards in China. He is a Managing
  Editor of Reviews in Mathematical Physics\, a Director of the Brahe Found
 ation\, and a foreign member of the Kungliga Vetenskapssocieten in Sweden 
 and Finska Vetenskaps-Societen.\n\nhttps://indico-tdli.sjtu.edu.cn/event/5
 401/
LOCATION:Tsung-Dao Lee Institute/N6F-N600 - Lecture Room (Tsung-Dao Lee In
 stitute)
URL:https://indico-tdli.sjtu.edu.cn/event/5401/
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