Atomic Physics Seminars

Special Atomic Seminar


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Meeting ID: 923 7073 2448
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Friday, April 23, 2021
2:00 PM
Online, Room via Zoom
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"Realising the Symmetry-Protected Haldane Phase in Fermi-Hubbard Ladders"

Timon Hilker , Max Planck Institute of Quantum Optics
[Host: Peter Schauss]

The spin-1 Haldane chain is the paradigmatic example of symmetry protected topological (SPT) phases, which are characterized by non-local 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 Fermi-gas microscope, we detect a finite non-local string correlator in the bulk of a Heisenberg two-leg ladder system and image localized spin-1/2 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 non-local order seen here to spin-charge separation in doped spin-1/2 chains. 


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