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Revealing the Superfluid Lambda Transition in the Universal Thermodynamics of a Unitary Fermi Gas
The superfluid phase transition in a strongly interacting Fermi gas is observed by high-precision measurements of the local compressibility, density, and pressure, which completely determine the universal thermodynamics of these gases without any fit or external thermometer.
Observation of Fermi polarons in a tunable Fermi liquid of ultracold atoms.
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.
The BCS-BEC crossover and the unitary fermi gas
There has been great excitement about the recent experimental and theoretical progress in elucidating the Bardeen-Cooper-Schrieffer (BCS) to Bose Einstein condensation (BEC) crossover in ultracold
Universal spin transport in a strongly interacting Fermi gas
It is demonstrated that interactions can be strong enough to reverse spin currents, with components of opposite spin reflecting off each other, and obtained the spin drag coefficient, the spin diffusivity and the spin susceptibility as a function of temperature on resonance and shown that they obey universal laws at high temperatures.
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.
Observation of bose-einstein condensation of molecules
Bose-Einstein condensation of molecules is observed, created from a spin mixture of fermionic 6Li atoms, and realizes the limit of tightly bound fermion pairs in the crossover between BCS and BEC superfluidity.
Quantum-gas microscope for fermionic atoms.
A quantum-gas microscope for fermionic atoms trapped in an optical lattice is realized, which allows one to probe strongly correlated fermions at the single-atom level and enables the direct observation of magnetic order, time-resolved measurements of the spread of particle correlations, and the detection of many-fermion entanglement.
Making, probing and understanding ultracold Fermi gases
A review on superfluidity and the BEC-BCS crossover in ultracold Fermi gases.
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.
Spin-injection spectroscopy of a spin-orbit coupled Fermi gas.
The coupling of the spin of electrons to their motional state lies at the heart of recently discovered topological phases of matter and the spin-orbit gap is revealed via spin-injection spectroscopy, which characterizes the energy-momentum dispersion and spin composition of the quantum states.