Conduction of Ultracold Fermions Through a Mesoscopic Channel

Abstract

In a mesoscopic conductor electric resistance is detected even if the device is defect-free. We engineer and study a cold-atom analog of a mesoscopic conductor. It consists of a narrow channel connecting two macroscopic reservoirs of fermions that can be switched from ballistic to diffusive. We induce a current through the channel and find ohmic conduction, even for a ballistic channel. An analysis of in-situ density distributions shows that in the ballistic case the chemical potential drop occurs at the entrance and exit of the channel, revealing the presence of contact resistance. In contrast, a diffusive channel with disorder displays a chemical potential drop spread over the whole channel. Our approach opens the way towards quantum simulation of mesoscopic devices with quantum gases.

References in corpus (9)

• Many-Body Physics with Ultracold Gases
• Direct observation of Anderson localization of matter-waves in a controlled disorder
• Matter-wave interferometry in a double well on an atom chip
• Three-dimensional localization of ultracold atoms in an optical disordered potential
• Three-Dimensional Anderson Localization of Ultracold Matter
• Localization of Matter Waves in 2D-Disordered Optical Potentials
• High-resolution imaging of ultracold fermions in microscopically tailored optical potentials
• Anisotropic 2D diffusive expansion of ultra-cold atoms in a disordered potential
• Mesoscopic transport of fermions through an engineered optical lattice connecting two reservoirs

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