LKB - Ultracold Fermi Gases

Tarik Yefsah

CNRS Researcher
Short CV
  • 2016 — present
    École Normale Supérieure (LKB) – CNRS Permanent Researcher
    Strongly Interacting Fermi Gases
  • 2015
    Max-Planck Munich – Postdoc

    Single Atom Detection in Optical Lattices
    with Pr. Immanuel Bloch
  • 2011 — 2015
    MIT – Postdoc

    Strongly Interacting Fermi Gases
    Artificial Gauge Fields
    with Pr. Martin Zwierlein
  • 2007 — 2011
    École Normale Supérieure (LKB) – PhD

    Weakly Interacting 2D Bose Gases
    with Pr. Jean Dalibard

Email: tarik.yefsah@lkb.ens.fr
Phone: +33 (0) 1 44 32 38 03

Laboratoire Kastler Brossel
Department of Physics
Ecole Normale Supérieure
24 rue Lhomond 75005 Paris

Our group studies the physics of ultracold Fermi gases in a regime where the interplay between interactions and quantum statistics gives rise to strong correlations between particles. At low temperature, the collective behavior of these interacting particles leads to dramatic effects, such as superfluidity, the analog for neutral particles of superconductivity. While strongly correlated Fermi systems are ubiquitous in Nature and modern materials, they are notoriously difficult to tackle theoretically. Our experiments constitute quantum simulators of unprecedented precision, which allow to address open questions of the many-body challenge.

Current Research

Lithium III Lab We are currently building a new experiment which aims at exploring the behavior of strongly interacting Bose and Fermi gases using Lithium isotopes. This new generation experiment is designed to allow for high resolution shaping of arbitrary potentials and detection of single atoms. These tools will offer a microscopic perspective for the study of the BEC-BCS crossover in 3D, 2D as well as topological states of matter.

Lithium Lab At sufficiently low temperature, a certain class of systems can become superfluid, which is a state of quantum matter where particles flow without friction. Both Bose and Fermi gases can enter the superfluid state when taken separately. But does superfluidity survive when bosons and fermions are put together and interact ? In 2014, this half-century old question was answered in the Lithium Lab, where the first mixture of Bose and Fermi superfluids was created. A long standing question was settled, but many more were raised…

Publications

15. Creating a bosonic Fractional Quantum Hall state by Pairing Fermions
C. Repellin, T. Yefsah, and A. Sterdyniak
Phys. Rev. B 96, 161111(R) (2017)

14. Homogeneous Atomic Fermi Gases
Biswaroop Mukherjee, Zhenjie Yan, Parth B. Patel, Zoran Hadzibabic, Tarik Yefsah, Julian Struck, Martin W. Zwierlein
Phys. Rev. Lett. 118123401 (2017)

13. Connecting few-body inelastic decay to quantum correlations in a many-body system: A weakly coupled impurity in a resonant Fermi gas
S. Laurent, M. Pierce, M. Delehaye, T. Yefsah, F. Chevy, C. Salomon
Phys. Rev. Lett. 118, 103403 (2017)

12. Exploring the many-body localization transition in two dimensions
Jae-yoon Choi, Sebastian Hild, Johannes Zeiher, Peter Schauß, Antonio Rubio-Abadal, Tarik Yefsah, Vedika Khemani, David A. Huse, Immanuel Bloch, Christian Gross
Science 352, 1547-1552 (2016)

11. Cascade of Solitonic Excitations in a Superfluid Fermi Gas: From Planar Solitons to Vortex Rings and Lines
Mark J.H. Ku, Biswaroop Mukherjee, Tarik Yefsah, Martin W. Zwierlein
Phys. Rev. Lett. 116, 045304 (2016)

10. Determination of Scale-Invariant Equations of State without Fitting Parameters: Application to the Two-Dimensional Bose Gas Across the Berezinskii-Kosterlitz-Thouless Transition
Rémi Desbuquois, Tarik Yefsah, Lauriane Chomaz, Christof Weitenberg, Laura Corman, Sylvain Nascimbène, Jean Dalibard
Phys. Rev. Lett. 113, 020404 (2014)

9. Motion of a Solitonic Vortex in the BEC-BCS Crossover
Mark J.H. Ku, Wenjie Ji, Biswaroop Mukherjee, Elmer Guardado-Sanchez, Lawrence W. Cheuk, Tarik Yefsah, Martin W. Zwierlein
Phys. Rev. Lett. 113, 065301 (2014)

    

8. Heavy Solitons in a Fermionic Superfluid
Tarik Yefsah, Ariel T. Sommer, Mark J.H. Ku, Lawrence W. Cheuk, Wenjie Ji, Waseem S. Bakr, Martin W. Zwierlein
Nature 499, 426-430 (2013)

7. Superfluid behaviour of a two-dimensional Bose gas
Rémi Desbuquois, Lauriane Chomaz, Tarik Yefsah, Julian Léonard, Jérôme Beugnon, Christof Weitenberg, Jean Dalibard
Nature Physics 8, 645 (2012)

6. Spin-Injection Spectroscopy of a Spin-Orbit Coupled Fermi Gas
Lawrence W. Cheuk, Ariel T. Sommer, Zoran Hadzibabic, Tarik Yefsah, Waseem S. Bakr, Martin W. Zwierlein
Phys. Rev. Lett. 109, 095302 (2012)

    

5. Absorption imaging of a quasi 2D gas: a multiple scattering analysis
L. Chomaz, L. Corman, T. Yefsah, R. Desbuquois, J. Dalibard
New Journal of Physics 14, 055001 (2012)

4. Exploring the thermodynamics of a two-dimensional Bose gas
Tarik Yefsah, Rémi Desbuquois, Lauriane Chomaz, Kenneth J. Günter, Jean Dalibard
Phys. Rev. Lett. 107, 130401 (2011)

3. The equilibrium state of a trapped two-dimensional Bose gas
Steffen P. Rath, Tarik Yefsah, Kenneth J. Guenter, Marc Cheneau, Remi Desbuquois, Markus Holzmann, Werner Krauth, Jean Dalibard
Phys. Rev. A 82, 013609 (2010)

2. Practical scheme for a light-induced gauge field in an atomic Bose gas
Kenneth J. Günter, Marc Cheneau, Tarik Yefsah, Steffen P. Rath, Jean Dalibard
Phys. Rev. A 79, 011604(R) (2009)

1. Geometric potentials in quantum optics: A semi-classical interpretation
Marc Cheneau, Steffen Patrick Rath, Tarik Yefsah, Kenneth John Günter, Gediminas Juzeliunas, Jean Dalibard
Europhysics Letters 83, 60001(2008)