Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 58: Quantum Gases: Fermions III
Q 58.2: Vortrag
Freitag, 10. März 2017, 14:45–15:00, P 204
Revealing "hidden" antiferromagnetic correlations in hole-doped Hubbard chains via string correllators — •Timon Hilker1, Guillaume Salomon1, Martin Boll1, Ahmed Omran1, Jayadev Vijayan1, Joannis Koepsell1, Immanuel Bloch1,2, and Christian Gross1 — 1Max-Planck-Institute für Quantenoptik, Garching — 2Fakultät für Physik, Ludwig-Maximilians-Universität, München
In 1D quantum many-body systems the elementary excitations split into an independent spin and density sector. A microscopic observation of this phenomenon is so far elusive. Here we report on the observation of a striking consequence of spin-charge separation in 1D Fermi-Hubbard chains via the full measurement of both spin and density distributions. Our analysis in terms of string operators reveals "hidden" antiferromagnetic spin correlations masked by the holes in the doped system in direct analogy to hidden order in spin-1 Haldane chains. This allows us to restore Heisenberg correlations in the spin sector of the system independent of the density sector by studying "squeezed space", which effectively removes the holes separating the spins.
Our measurements demonstrate the power of quantum gas microscopes for the study of doped Hubbard systems that can be directly transferred to two dimensional systems.