Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 59: Quantum Gases (Bosons) VI
Q 59.6: Vortrag
Donnerstag, 8. März 2018, 11:45–12:00, K 2.020
Coupled order parameters with ultracold atoms in two crossed cavities — •Philip Zupancic1, Andrea Morales1, Julian Léonard1,2, Xiangliang Li1, Davide Dreon1, Tilman Esslinger1, and Tobias Donner1 — 1Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland — 2Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
The concept of intertwined order describes the simultaneous existence of independent order parameters and can therefore allow materials to feature multiple properties. Examples include multiferroic materials that have coexisting ferroelectric and ferromagnetic orders leading to enhanced functionalities, and materials that are superconducting at high temperatures due to intertwining between charge- and spin-order.
I will report on our recent experimental realization of an intertwined ordered phase in a quantum gas where we can control the interaction between the atoms at the microscopic level. Our system is realized by a BEC that can transit into self-organized phases with the modes of two crossed optical cavities.
For vanishing inter-order coupling we realize a supersolid phase of matter by symmetry enhancement of the composite order parameter to a U(1) symmetry. Here we observe the simultaneous existence of a Higgs and Goldstone mode. Increasing the inter-order coupling, this symmetry breaks down to a Z2×Z2, and we observe the emergence of an extended intertwined phase arising from the coupling of the individual order parameters. This coupling enables us to increase or decrease the critical point of one order by controlling the other.