Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 36: Quantum Gases: Bosons IV

Q 36.5: Talk

Wednesday, March 2, 2016, 15:30–15:45, e001

Coherent interaction of a Bose-Einstein condensate with two crossed cavity modes — •Julian Leonard, Andrea Morales, Philip Zupancic, Tilman Esslinger, and Tobias Donner — Institute for Quantum Electronics, ETH Zürich, Switzerland

Coupling a quantum gas to the field of a single high-finesse optical cavity gives rise to interactions of infinite range between the atoms, which can create a self-organized state when exceeding a critical strength. It is desirable to tune range and directionality of these interactions, which enables explorations of more complex self-organized states or quantum soft matter physics, such as superfluid glasses and associative memory. However, this requires extending the atom-photon interactions to multiple cavity modes.

We report on the realization of such an extended system, involving a Bose-Einstein condensate coupled to two crossed cavities modes. This already allows to spatially shape the interactions, leading to multiple new crystalline phases, e.g. with hexagonal, triangular or stripe order.