Total Current Blockade in an Ultra-Cold Dipolar Quantum Wire

TL;DR

This paper demonstrates that ultra-cold dipolar quantum gases can exhibit a total current blockade due to attractive interactions, revealing a novel quantum transport phenomenon in cold atom systems.

Contribution

It introduces the concept of total current blockade in ultra-cold dipolar quantum wires, a phenomenon not observed in traditional electronic systems.

Findings

Attractive interactions can suppress current in ultra-cold quantum gases.

Total current blockade occurs at low bias in dipolar quantum wires.

The effect is demonstrated with ultra-cold gases with dipolar interactions.

Abstract

Cold atom systems offer a great potential for the future design of new mesoscopic quantum systems with properties that are fundamentally different from semiconductor nanostructures, such as quantum dots and quantum wires with electrons. Here, we investigate the analog of a quantum wire using ultra-cold particles, and find a new scenario for the quantum transport: Attractive interactions may lead to a complete suppression of current in the low-bias range, a total current blockade. We demonstrate this effect for the example of ultra-cold quantum gases with dipolar interactions.