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Observation of Fermi polarons in a tunable Fermi liquid of ultracold atoms.
- A. Schirotzek, Cheng-Hsun Wu, A. Sommer, M. Zwierlein
- PhysicsPhysical review letters
- 17 February 2009
The polaron energy and the quasiparticle residue for various interaction strengths around a Feshbach resonance are determined and the transition from polaronic to molecular binding is observed at a critical interaction.
Vortices and superfluidity in a strongly interacting Fermi gas
Observation of vortex lattices in a strongly interacting, rotating Fermi gas that provide definitive evidence for superfluidity are reported and the crossover from a Bose–Einstein condensate of molecules to a Bardeen–Cooper–Schrieffer superfluid of loosely bound pairs is explored.
Fermionic Superfluidity with Imbalanced Spin Populations
The superfluidity regime was established in a two-state mixture of ultracold fermionic atoms with imbalanced state populations and the quantum phase transition to the normal state was characterized, known as the Pauli limit of superfluidity.
Phase diagram of a two-component Fermi gas with resonant interactions
The phase diagram of a spin-polarized Fermi gas of 6Li atoms at unitarity is presented, experimentally mapping out the superfluid phases versus temperature and density imbalance and the implementation of an in situ ideal gas thermometer provides quantitative tests of theoretical calculations on the stability of resonant superfluidity.
Cooling Bose-Einstein Condensates Below 500 Picokelvin
Spin-polarized gaseous Bose-Einstein condensates were confined by a combination of gravitational and magnetic forces and evaporatively reduced in size to 2500 atoms, cooling the entire cloud in all three dimensions to a kinetic temperature of 450 ± 80 picokelvin.
Direct observation of the superfluid phase transition in ultracold Fermi gases
This work reports the direct observation of the superfluid phase transition in a strongly interacting gas of 6Li fermions, through sudden changes in the shape of the clouds—in complete analogy to the case of weakly interacting Bose gases.
Observation of phase separation in a strongly interacting imbalanced fermi gas.
- Y. Shin, M. Zwierlein, C. Schunck, A. Schirotzek, W. Ketterle
- PhysicsPhysical review letters
- 16 June 2006
The in situ distribution of the density difference between two trapped spin components is obtained using phase-contrast imaging and 3D image reconstruction and the phase transition induces a dramatic change in the density profiles as excess fermions are expelled from the superfluid.
Determination of the superfluid gap in atomic Fermi gases by quasiparticle spectroscopy.
There is a smooth evolution in the nature of pairing correlations from pairing in the superfluid region to polaron binding in the highly polarized normal region, which leads to a local bimodal spectral response, which allowed us to determine the superfluids gap Delta and the Hartree energy U.
Fermionic Superfluidity with Imbalanced Spin Populations and the Quantum Phase Transition to the Normal State
Feynman diagrams versus Fermi-gas Feynman emulator
Precise understanding of strongly interacting fermions, from electrons in modern materials to nuclear matter, presents a major goal in modern physics. However, the theoretical description of…