A double-dot quantum ratchet driven by an independently biased quantum point contact

Abstract

We study a double quantum dot (DQD) coupled to a strongly biased quantum point contact (QPC), each embedded in independent electric circuits. For weak interdot tunnelling we observe a finite current flowing through the unbiased Coulomb blockaded DQD in response to a strong bias on the QPC. The direction of the current through the DQD is determined by the relative detuning of the energy levels of the two quantum dots. The results are interpreted in terms of a quantum ratchet phenomenon in a DQD energized by a nearby QPC.

revised version

References in corpus (2)

• Driven quantum transport on the nanoscale
• Using a quantum dot as a high-frequency shot noise detector

Cited by in corpus (14)

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• Telegraph Noise in Coupled Quantum Dot Circuits Induced by a Quantum Point Contact
• Statistical electron excitation in a double quantum dot induced by two independent quantum point contacts
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• Detecting THz current fluctuations in a quantum point contact using a nanowire quantum dot
• Underdamped quantum ratchets
• Noise-induced spectral shift measured in a Double Quantum Dot
• Theory of quantum noise detectors based on resonant tunneling
• Nonequilibrium interactions between two quantum circuits
• Nonequilibrium phenomena in adjacent electrically isolated nanostructures