Phonon Spectroscopy by Electric Measurements of Coupled Quantum Dots

Abstract

We propose phonon spectroscopy by electric measurements of the low-temperature conductance of coupled-quantum dots, specifically employing dephasing of the quantum electronic transport by the phonons. The setup we consider consists of a T-shaped double-quantum-dot (DQD) system in which only one of the dots (dot 1) is connected to external leads and the other (dot 2) is coupled solely to the first one. For noninteracting electrons, the differential conductance of such a system vanishes at a voltage located in-between the energies of the bonding and the anti-bonding states, due to destructive interference. When electron-phonon (e-ph) on the DQD is invoked, we find that, at low temperatures, phonon emission taking place on dot 1 does not affect the interference, while phonon emission from dot 2 suppresses it. The amount of this suppression, as a function of the bias voltage, follows the effective e-ph coupling reflecting the phonon density of states and can be used for phonon spectroscopy.

arXiv comment9 pages, 6 figures

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Cited by in corpus (5)

• Decoherence and lead induced inter-dot coupling in nonequilibrium electron transport through interacting quantum dots: A hierarchical quantum master equation approach
• Quantum Interference and Decoherence in Single-Molecule Junctions: How Vibrations Induce Electrical Current
• Thermodynamics of the polaron master equation at finite bias
• Interference and shot noise in a degenerate Anderson-Holstein model
• Many-Body Coherence in Quantum Transport