Observing the Drop of Resistance in the Flow of a Superfluid Fermi Gas

Abstract

In this work, we investigate the conduction properties of strongly interacting fermions flowing through a quasi two-dimensional, multimode channel, which connects two atomic reservoirs. The atomic current in the channel is controlled using a repulsive potential created by an off-resonant laser beam. In analogy with an electronic field-effect transistor, this gate potential controls the chemical potential in the channel while keeping the temperature imposed by the reservoirs unchanged. With the gate potential as a control parameter, we measure the current through the channel over a large dynamic range and determine the density distribution in the channel region. This allows us to observe the onset of superfluid flow of strongly interacting fermions. These measurements are compared to the case of a weakly interacting Fermi gas.

This manuscript is the version that has been submitted to Nature magazine. A revised version was accepted for publication and will soon be available

References in corpus (13)

• Many-Body Physics with Ultracold Gases
• Theory of ultracold Fermi gases
• Observation of Superfluidity of Polaritons in Semiconductor Microcavities
• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
• Universal Quantum Viscosity in a Unitary Fermi Gas
• Viscosity and scale invariance in the unitary Fermi gas
• Critical velocity for superfluid flow across the BEC-BCS crossover
• Measurement of the Entropy and Critical Temperature of a Strongly Interacting Fermi Gas
• Dynamics of a tunable superfluid junction
• Crossover from 2D to 3D in a weakly interacting Fermi gas
• Determination of the Fermion Pair Size in a Resonantly Interacting Superfluid
• High-resolution imaging of ultracold fermions in microscopically tailored optical potentials

Cited by in corpus (17)

• Observation of Quantized Conductance in Neutral Matter
• Two-terminal transport measurements with cold atoms
• Connecting dissipation and phase slips in a Josephson junction between fermionic superfluids
• Ultrafast dynamics of finite Hubbard clusters - a stochastic mean-field approach
• Peltier cooling of fermionic quantum gases
• Thermopower and thermal conductance of a superconducting quantum point contact
• Thermoelectric transport and Peltier cooling of cold atomic gases
• Importance of realistic phase space representations of initial quantum fluctuations using the stochastic mean-field approach for fermions
• Thermoelectricity in a junction between interacting cold atomic Fermi gases
• Challenges and constraints of dynamically emerged source and sink in atomtronic circuits: From closed-system to open-system approaches
• Fast thermalization and Helmholtz oscillations of an ultracold Bose gas
• Temperature Dependent Energy Diffusion in Chaotic Spin Chains
• Topological phase transition in the quench dynamics of a one-dimensional Fermi gas
• Fluctuation Effects on the Transport Properties of Unitary Fermi Gases
• Spin-asymmetric Josephson plasma oscillations
• Superfluid Oscillator Circuit with Quantum Current Regulator
• Quantum transport between finite reservoirs