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Viewpoint: Towards an Atomtronic Diode

Andrew J. Daley

Published Jul 27, 2015• 2 citations
OpenAlex

Abstract

Rubidium atoms in an optical trap have been made to exhibit negative differential conductance, a phenomenon normally found in semiconductor diodes.

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Towards an Atomtronic Diode

Andrew J. Daley

We report on the observation of negative differential conductivity (NDC) in a quantum transport device for neutral atoms employing a multimode tunneling junction.The system is realized with a Bose-Einstein condensate loaded in a one-dimensional optical lattice with high site occupancy.We induce an initial difference in chemical potential at one site by local atom removal.The ensuing transport dynamics are governed by the interplay between the tunneling coupling, the interaction energy, and intrinsic collisions, which turn the coherent coupling into a hopping process.The resulting current-voltage characteristics exhibit NDC, for which we identify atom number-dependent tunneling as a new microscopic mechanism.Our study opens new ways for the future implementation and control of complex neutral atom quantum circuits.

Physics•Jul 27, 2015•4 citations
We report on the observation of negative differential conductivity (NDC) in a quantum transport device for neutral atoms employing a multimode tunneling junction.The system is realized with a Bose-Einstein condensate loaded in a one-dimensional optical lattice with high site occupancy.We induce an initial difference in chemical potential at one site by local atom removal.The ensuing transport dynamics are governed by the interplay between the tunneling coupling, the interaction energy, and intrinsic collisions, which turn the coherent coupling into a hopping process.The resulting current-voltage characteristics exhibit NDC, for which we identify atom number-dependent tunneling as a new microscopic mechanism.Our study opens new ways for the future implementation and control of complex neutral atom quantum circuits.