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DTSTART:20170326T030000
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DTSTAMP:20260428T204804Z
UID:59562bc69e70d552188988@ist.ac.at
DTSTART:20170717T150000
DTEND:20170717T200000
DESCRIPTION:Speaker: Daniel Greif\nhosted by Johannes Fink\nAbstract: Stron
 gly correlated electron systems such as high-temperature superconductors a
 nd pseudo-gap states are a cornerstone of modern condensed matter research
 . A complementary approach to studying solid-state systems is to build an 
 experimentally tunable quantum system governed by the Hubbard model\, whic
 h is thought to qualitatively describe these systems but is difficult to u
 nderstand theoretically. Ultracold fermionic quantum gases in optical latt
 ices provide a clean and tunable implementation of the Hubbard model. At t
 he same time\, optical microscopy in these systems gives access to single-
 site observables and correlation functions\, and provides dynamic control 
 of the potential landscape at the single-site level. \n\nSo far\, ultracol
 d atom experiments have not been able to reach the low-temperature regime 
 of the Hubbard model\, which becomes particularly interesting when doped. 
 I will report on the observation of antiferromagnetic long-range order in 
 a repulsively interacting Fermi gas of Li-6 atoms on a 2D square lattice c
 ontaining about 80 sites. The ordered state is directly detected from a pe
 ak in the spin structure factor and a diverging correlation length of the 
 spin correlation function. When doping away from half-filling into a numer
 ically intractable regime\, we find that long-range order extends to dopin
 g concentrations of about 15%. Our results open the path for a controlled 
 study of the low-temperature phase diagram of the Hubbard model.
LOCATION:Big Seminar room Ground floor / Office Bldg West (I21.EG.101)\, IS
 TA
ORGANIZER:sdanzing@ist.ac.at
SUMMARY:Daniel Greif: Exploring Quantum Antiferromagnets with single-site r
 esolution
URL:https://talks-calendar.ista.ac.at/events/673
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