A Thouless pump with dipolar interactions

Thouless pumping represents a powerful concept to probe quantized topological invariants in quantum systems. We explore this mechanism in a generalized Rice-Mele Fermi-Hubbard model characterized by the presence of competing onsite and intersite interactions. While large on-site repulsion leads to a breakdown of quantized pumping , sufficiently large intersite interactions allow for an interaction-induced recovery of Thouless pumps. The stable topological transport at large interactions is connected to the presence of a spontaneous bond-order-wave in the ground-state phase diagram of the model. We also discuss a concrete experimental setup based on ultracold magnetic atoms in an optical lattice.

The pre-print can be accessed here: arXiv

LFUI Guest Professorship granted

Luca Barbiero
Politecnico di Torino, Italy

Our group is very happy to announce that Dr. Luca Barbiero, currently Asssistent Professor at Politecnico di Torino, will visit us for a LFUI Guest Professorship for two months during October and November 2023. During his stay we will together work on new ideas on how to use our experimental dipolar platforms for the quantum simulation of Bose- and Fermi-Hubbard models with strong dipolar interactions. He will also give a special lecture on equilibrium and out-of-equilibrium properties of dipolar lattice systems to interested Master- and PhD-students.

Cluster of Excellence Quantum Science Austria granted

Quantum Science Austria
University of Innsbruck, University of Vienna, Vienna University of Technology, University of Linz, IST Austria, Austrian Academy of Sciences

The Second Quantum Revolution – the breathtaking development of modern quantum science – would not have been conceivable without the pioneering contributions from Austria. Based on them, quantum technologies are being developed today that surpass classical technologies in many areas. The Cluster of Excellence Quantum Science Austria, which has now been approved by the Austrian Science Fund FWF, is advancing basic research in the quantum sciences, aims to expand the frontiers of knowledge and thus be the engine for future innovations. The focus is on fundamental questions regarding the quantum nature of space, time and gravity, new paradigms in quantum information science and the physics of quantum many-body systems. The scientists* in Innsbruck, Vienna, Linz and Klosterneuburg are asking innovative fundamental questions that can only be solved by combining the unique know-how available in Austria. With well-controlled model systems based on trapped ions, ultracold atoms, long-range interaction systems, photonic systems, superconducting quantum circuits, and nanoscopic solid-state systems, they aim to unravel the most challenging puzzles of the quantum world.

Review of recent experiments with dipolar gases

The last 15 years has seen tremendous experimental progress for the manipulation and control of ultracold atoms with sizeable dipole-dipole interactions. In this review, together with other group leaders who first condensed dysprosium and chromium, we review the discoveries made so far, and lay out the future perspectives for this exciting field!

The paper can be found here: Dipolar physics: a review of experiments with magnetic quantum gases – IOPscience