Contact resistance and phase slips in mesoscopic superfluid atom transport

Area of Science:

• Atomic physics
• Quantum fluids
• Mesoscopic systems

Background:

• Superfluidity in Bose-Einstein condensates (BECs) is a quantum phenomenon.
• Understanding transport properties in mesoscopic systems is crucial for quantum technologies.

Purpose of the Study:

• To experimentally investigate the transport of superfluid, bosonic atoms in a mesoscopic channel.
• To characterize the transition from resistive flow to superflow and associated oscillations.

Main Methods:

• Experimental measurement of atom transport in a channel connecting two reservoirs.
• Modeling the observed transport using an electronic circuit analogy.
• Comparing experimental conductance with microscopic phenomenological models.

Main Results:

• Observed resistive flow transitioning to oscillation-characterized superflow at a critical current.
• Successfully reproduced the transport evolution with a simple electronic circuit model.
• Confirmed oscillations are consistent with LC oscillations, estimating kinetic inductance and effective capacitance.

Conclusions:

• The experiment demonstrates a controllable platform for studying mesoscopic transport in dilute Bose gases.
• The findings offer insights into the interplay of superfluidity and resistive transport in confined quantum systems.
• The electronic circuit analogy provides a valuable tool for understanding complex quantum transport phenomena.