# Lattice Gases

## Lattice Gases

Coordinator: David Clément

PhD. Students: Cecile Carcy, Antoine Tenart

Interns: Gaétan Hercé, Chao Zhang

We have built an apparatus to manipulate metastable Helium atoms (He*) loaded in optical lattices and to measure atom-atom correlations in many-body quantum states. The special properties of He*, its light mass and its large internal energy, enable an original and innovative detection method which can reconstruct the three dimensional positions of and correlations between individual atoms after a long time of free fall, providing direct access to momentum-space correlations.

## News

September 2019: our preprint on the measurement of two-body collisions in the time-of-flight expansion of lattice bosons has been published on the arXiv (arXiv:1909.13648 here). An example of a 3D atom distribution from a lattice superfluid is shown on the left, where the scattering spheres are clearly visible.

April 2019: we have measured momentum-space correlations between individual atoms in a Mott insulator, finding that 2-body and 3-body correlation functions (see picture) are those of a ground-state with a Gaussian density operator. Our preprint can be found in here.

November 2018: our theory paper about the contact in 1D Bose gases appears in Physical Review Letters (here)

November 2018: Hugo has defended successfully his PhD thesis, congratulations !

June 2018: Antoine has obtained a PhD grant from the Doctoral school of Paris Saclay to start his PhD next september !

April 2018: Cécile receives a Best Poster prize at the WE-Heraeus seminar: Quantum Gases and Quantum Coherence in Bad Honnef. Congratulations!

Mars 2018: observation of the bosonic Mott transition in a 3D optical lattice with metastable Helium atoms.



## Publications

#### 2019

Two-body collisions in the time-of-flight dynamics of lattice Bose superfluids, A. Tenart, C. Carcy, H. Cayla, T. Bourdel, M. Mancini, D. Clément, arXiv:1909.13648 (2019).

Momentum-space atom correlations in a Mott insulator, C. Carcy, H. Cayla, A. Tenart, A. Aspect, M. Mancini, D. Clément, Phys. Rev. X in press, arXiv:1904.10995 (2019).

Contact and sum-rules in a near-uniform Fermi gas at unitarityC. Carcy, S. Hoinka, M. G. Lingham, P. Dyke, C. C. N. Kuhn, H. Hu, C. Vale, Phys. Rev. Lett. 122, 203401 (2019).

#### 2018

Tan's Contact for Trapped Lieb-Liniger Bosons at Finite Temperature, H. Yao, D. Clément, A. Minguzzi, P. Vignolo, L. Sanchez-Palencia Phys. Rev. Lett. 121, 220402 (2018).

Single-atom-resolved probing of lattice gases in momentum space, H. Cayla, C.Carcy, Q. Bouton, R. Chang, G. Carleo, M. Mancini, D. Clément, Phys. Rev. A 97 061609(R) (2018)

#### 2017

Quantum depletion of a homogeneous Bose-Einstein condensate , R. Lopes, C. Eigen, N. Navon, D. Clément, R. P. Smith, Z. Hadzibabic, Phys. Rev. Lett. 119, 190404 (2017).

#### 2016

Momentum-resolved observation of thermal and quantum depletion in an interacting Bose gas, R. Chang, Q. Bouton, H. Cayla, C. Qu, A. Aspect, C. I. Westbrook, D. Clément, Phys. Rev. Lett. 117, 235303 (2016).

#### 2015

Characterization of a detector chain using a FPGA-based Time-to-Digital Converter to reconstruct the three-dimensional coordinates of single particles at high flux, F. Nogrette, D. Heurteau, R. Chang, Q. Bouton, C. I. Westbrook, R. Sellem, D. Clément, Rev. Scient. Intrum. 86, 113105 (2015)

Fast production of Bose-Einstein condensates of metastable Helium, Q. Bouton, R. Chang, L. Hoendervanger, F. Nogrette, A. Aspect, C. I. Westbrook, D. Clément Phys. Rev. A 91 061402(R) (2015)

Dynamical structure factor of one-dimensional Bose gases: experimental signatures of beyond-Luttinger liquid physics, N. Fabbri, M. Panfil, D. Clément, L. Fallani, M. Inguscio, C. Fort and J.-S. Caux, Phys. Rev. A 91, 043617 (2015)

#### 2014

Three-dimensional laser cooling at the Doppler limit, R. Chang, A.L. Hoendervanger, Q. Bouton, Y. Fang, T. Klafka, K. Audo, A. Aspect, C. I .Westbrook and D. Clément Phys. Rev. A 90 063407 (2014) [selected as Editors's suggestion]

#### 2013

Influence of Gold Coating and Interplate Voltage on the Performance of Chevron Micro-Channel Plates for the Temporally and Spatially Resolved Single Particle Detection, A.L. Hoendervanger, D. Clément, A. Aspect, C.I. Westbrook, D. Dowek, Y. Picard and D. Boiron Rev. Scient. Instrum. 84 023307 (2013)

#### 2012

An oscillator circuit to produce a radio-frequency discharge and application to metastable helium saturated absorption spectroscopy, F. Moron, A.L. Hoendervanger, M. Bonneau, Q. Bouton, A. Aspect, D. Boiron, D. Clément and C.I. Westbrook, Rev. Scient. Instrum. 83 044705 (2012)