SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 56: Quantum Gases: Fermions II

Q 56.5: Talk

Thursday, March 9, 2023, 15:30–15:45, F342

Dark state transport in a strongly interacting Fermi gas — Mohsen Talebi, •Simon Wili, Philipp Fabritius, Jeffrey Mohan, Meng-Zi Huang, and Tilman Esslinger — Department of Physics, ETH Zürich, 8093 Zürich, Switzerland

Laser-induced coherence of atomic states can dramatically alter the properties of an atomic medium. For example, a three-level system in a lambda configuration can be transparent to a resonant laser when another laser drives the other resonance. This is known as electromagnetically induced transparency (EIT). Another feature is the so-called dark state: The system driven by two lasers has an eigenstate which is a superposition of the two ground states. While the amplitudes of this superposition, described by a mixing angle, depend on the optical fields, the energy of this state does not, hence it is dark. EIT and dark states have various applications, such as slow light, stimulated rapid adiabatic passage (STIRAP), and photonic quantum memory. Here we study transport of a Fermi gas with two strongly-interacting spins, one of which is subject to an auxiliary lambda system. We create a particle current flowing through a one-dimensional channel connecting two superfluid reservoirs. A localized laser beam addressing a transition of the lambda system in the channel suppresses fast particle transport, while a second beam fulfilling the EIT condition can revive the fast transport. Hence we demonstrate a current that comprises a dark state for the first time in a strongly-interacting fermionic system. As in our system the pairing interaction depends on the mixing angle, this work paves the way for local and temporal engineering of fermionic pairing.