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UID:69e5c4c233af6
DTSTART:20241204T110000Z
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20241204T120000Z
LOCATION:Seminar Room
SUMMARY:ICFO | ANDREAS MEYER
CLASS:PUBLIC
DESCRIPTION:The relaxation behaviour of isolated quantum systems taken out 
 of equilibrium is among the most intriguing questions in many-body physics
 1. Quantum systems out of equilibrium typically relax to thermal equilibri
 um states by scrambling local information and building up entanglement ent
 ropy. However\, kinetic constraints in the Hamiltonian can lead to a break
 down of this fundamental paradigm owing to a fragmentation of the underlyi
 ng Hilbert space into dynamically decoupled subsectors in which thermaliza
 tion can be strongly suppressed2\,3\,4\,5. Here we experimentally observe 
 Hilbert space fragmentation in a two-dimensional tilted Bose&ndash\;Hubbar
 d model. Using quantum gas microscopy\, we engineer a wide variety of init
 ial states and find a rich set of manifestations of Hilbert space fragment
 ation involving bulk states\, interfaces and defects\, that is\, two-\, on
 e- and zero-dimensional objects. Specifically\, uniform initial states wit
 h equal particle number and energy differ strikingly in their relaxation d
 ynamics. Inserting controlled defects on top of a global\, non-thermalizin
 g chequerboard state\, we observe highly anisotropic\, subdimensional dyna
 mics\, an immediate signature of their fractonic nature6\,7\,8\,9. An inte
 rface between localized and thermalizing states in turn shows dynamics dep
 ending on its orientation. Our results mark the observation of Hilbert spa
 ce fragmentation beyond one dimension\, as well as the concomitant direct 
 observation of fractons\, and pave the way for in-depth studies of microsc
 opic transport phenomena in constrained systems.
DTSTAMP:20260420T061634Z
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