17-22 July 2022
Royal Conservatory of Music, Toronto
America/Toronto timezone

Breakdown of topological transport in a Hubbard-Thouless pump

20 Jul 2022, 17:00
1h 30m
Hart House (Hart House)

Hart House

Hart House

7 Hart House Cir, Toronto, ON M5S 3H3
Poster presentation Degenerate gases, many-body physics, and quantum simulation Poster session

Description

The fate of topological transport in the strongly correlated regime raises fundamental questions on the role of geometry in quantum many-body physics. A paradigm of quantised transport is the topological Thouless pump, which represents the one-dimensional, dynamic analogue of the quantum Hall effect. A few experiments have explored the effects of interactions on Thouless pumping in two-body and optical mean-field systems, but the strongly correlated regime has so far remained out of reach. Here, we experimentally detect the breakdown of topological transport due to strong Hubbard interactions in a fermionic Thouless pump, facilitated by a dynamical optical superlattice. We observe the deviation from quantised pumping for repulsive Hubbard U, which we attribute to pinned atoms in a Mott insulator. On the attractive side another mechanism is reducing the pumping efficiency: a smaller energy gap for pair pumping makes the evolution less adiabatic [1]. The dynamical superlattice operated at a single frequency establishes a novel platform for studying topology in the presence of strong correlations in one, two, and possibly three dimensions, including avenues to fractional transport.

Presenter name Zhu, Zijie
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Primary authors

Mr Zijie Zhu (Institute for Quantum Electronics & Quantum Center, ETH Zurich) Ms Anne-Sophie Walter (Institute for Quantum Electronics & Quantum Center, ETH Zurich) Mr Marius Gaechter (Institute for Quantum Electronics & Quantum Center, ETH Zurich) Mr Joaquin Minguzzi (Institute for Quantum Electronics & Quantum Center, ETH Zurich) Mr Stephan Roschinski (Institute for Quantum Electronics & Quantum Center, ETH Zurich) Dr Kilian Sandholzer (Institute for Quantum Electronics & Quantum Center, ETH Zurich) Dr Konrad Viebahn (Institute for Quantum Electronics & Quantum Center, ETH Zurich) Prof. Tilman Esslinger (Institute for Quantum Electronics & Quantum Center, ETH Zurich)

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