"Realising the SymmetryProtected Haldane Phase in FermiHubbard Ladders"Timon Hilker , Max Planck Institute of Quantum Optics [Host: Peter Schauss]
ABSTRACT:
The spin1 Haldane chain is the paradigmatic example of symmetry protected topological (SPT) phases, which are characterized by nonlocal order and edge states. In my talk, I will report on the experimental realization of such a phase using ultracold fermions in optical lattices (arXiv:2103.10421). Using the full spin and density resolution of our Fermigas microscope, we detect a finite nonlocal string correlator in the bulk of a Heisenberg twoleg ladder system and image localized spin1/2 states at its edges. We find the phase to be robust to perturbations that preserve the spin symmetry. Going beyond the spin model, we then study the effects of charge fluctuations on the SPT phase in the more general Hubbard ladder. Finally, I will compare the nonlocal order seen here to spincharge separation in doped spin1/2 chains.

Atomic Physics Seminar Friday, April 23, 2021 2:00 PM Online, Room via Zoom Note special date. Note special time. Note special room. Special Atomic Seminar
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