Phase coherence in out-of-equilibrium supersolid states of ultracold dipolar atoms

Phase coherence in out-of-equilibrium supersolid states of ultracold dipolar atoms

By quenching the contact interaction, it is possible to destroy the phase coherence in a dipolar supersolid. However, the supersolidity is “repaired” when reversing the dephasing process.  

3D array of large-spin fermions

3D array of large-spin fermions

In joint theoretical and experimental work with our theory colleagues A.-M. Rey (JILA) and B. Zhu (ITAMP) we investigate dipolar induced magnetization-conserving spin exchange dynamics with fermionic Er in a 3D optical lattice

The ERBIUM lab

The ERBIUM lab

The ERBIUM lab

Excitation spectrum of a trapped dipolar supersolid

Excitation spectrum of a trapped dipolar supersolid

In a combined theory and experimental work, we study the elementary excitations of trapped dipolar quantum gases crossing from regular superfluid to supersolid.

First Dipolar Quantum Mixtures!

First Dipolar Quantum Mixtures!

We have created for the first time a dipolar quantum mixture by combining two highly magnetic atomic species, Erbium and Dysprosium.

Observation of roton quasiparticles in Erbium

Observation of roton quasiparticles in Erbium

In collaboration with our theory collaborators from Innsbruck and Hannover, we have observed for the first time so-called roton quasiparticles in an ultracold bosonic gas of erbium atoms.

Double MOT …

Double MOT …

… of cold erbium (yellow) and dysprosium (red) atoms. © IQOQI

Laser setup …

Laser setup …

… for slowing and trapping erbium and dysprosium atoms. © IQOQI

Our dipolar quantum gas group …

Our dipolar quantum gas group …

…we work with highly magnetic Erbium and Dysprosium atoms, which we cool to Nanokelvin temperatures in oder to explore the fascinating physics of the quantum world.

Working in ultrahigh vacuum

Working in ultrahigh vacuum

All our experiments are carried out at pressures of 10^(-11) mbar. In order to achieve these ultrahigh vacuums, carefully designed chambers need to be machined and assembled.

The Dipolar Quantum Gas Group is one of the three teams composing the Innsbruck Center for Ultracold Atoms and Quantum Gases. We focus on highly magnetic magnetic Lanthanide atoms, Erbium and Dysprosium, which are a novel and powerful resource for realizing dipolar quantum matter.

The group, led by Francesca Ferlaino, is located at the  Institute for Experimental Physics (IExP) of the University of Innsbruck and at the Institute for Quantum Optics and Quantum Information (IQOQI) of the Austrian Academy of Sciences.

We have three experimental apparatuses. The ERBIUM machine operates on Er atoms and produced the first Er Bose-Einstein condensate and degenerate Fermi gas. The ER-DY machine is studying degenerate mixtures of two different lanthanides: Er and Dy. The T-Reqs is currently under construction and aims at studying Rydberg states of Er. A new theory sub-division within our group is under development.

News from the labs
Supersolids go circular! Our Er-Dy and theory labs collaborate together to realise supersolidity in round traps. We also investigate effective formation protocols for two-dimensional supersolids, and explore the rich excitation spectra of these objects.
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Our experimental work on the lifecycle of a supersolid got selected as APS Editors' Suggestion, featured in Physics Viewpoint with an article by Chinmayee Mishra and in Physics World with an article by Oliver Stockdale. Congratulation to the Er-Dy Team!
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Now in PRL! The supersolid phase transition at finite temperature is poorly understood since tools for an adequate theoretical simulation are still lacking. We have characterised the evaporative formation of a dipolar supersolid from a thermal gas using in-situ imaging. The work is to appear in PRL.
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Group news
Dani held his defense for his PhD thesis and is now officially a Doctor of Philosophy. He will continue to carry out his research as a post-doctoral fellow beginning of next year in the group of David Norris at the ETH. Congratulations and good luck!
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Hagai has been awarded a postdoctoral fellowship for quantum science and technology from the Israel Council of Higher Education.  As a postdoc, Hagai will study highly excited Erbium atoms trapped in a tweezer array in the T-REQS lab of Francesca Ferlaino.
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Benedict has successful completed his master project in the T-Reqs experiments on “Optimisation of a spin-flip Zeeman slower and laser locking to a broad spectral line”. Congratulation, Benedict!
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Welcome and goodbye
Farwell to Daniel Grün who is moving to the University of Alberta as PhD Student in the group of Lindsay J LeBlanc. We wish you all the best for your next adventure in physics.
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Welcome to Arfor, who has joined the Erbium team as PhD Student.
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After 5 productive years in the Dipolar Quantum Gas Group, Arno Trautmann is moving to the University of Tübingen as post-doc in the group of Professor Christian Groß. We wish you great success in your next adventure in physics
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