Kondo blockade due to quantum interference in single-molecule junctions

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Title: Kondo blockade due to quantum interference in single-molecule junctions
Authors: Mitchell, Andrew K.
Pedersen, Kim G. L.
Hedegård, Per
Paaske, Jens
Permanent link: http://hdl.handle.net/10197/9284
Date: 11-May-2017
Abstract: Molecular electronics offers unique scientific and technological possibilities, resulting from both the nanometer scale of the devices and their reproducible chemical complexity. Two fundamental yet different effects, with no classical analogue, have been demonstrated experimentally in single-molecule junctions: quantum interference due to competing electron transport pathways, and the Kondo effect due to entanglement from strong electronic interactions. We unify these phenomena, showing that transport through a spin-degenerate molecule can be either enhanced or blocked by Kondo correlations, depending on the molecular structure, contacting geometry, and applied gate voltages. An exact framework is developed, in terms of which the quantum interference properties of interacting molecular junctions can be systematically studied and understood. We prove that an exact Kondo-mediated conductance node results from destructive interference in exchange-cotunneling. Nonstandard temperature dependences and gate-tunable conductance peaks/nodes are demonstrated for prototypical molecular junctions, illustrating the intricate interplay of quantum effects beyond the single-orbital paradigm.
Type of material: Journal Article
Publisher: Springer Nature
Copyright (published version): 2017 the Authors
Keywords: Molecular electronics;Single molecule transistors;Nanoelectronics;Nanotechnology;Nanoscience;Strongly correlated electrons;Theoretical physics;Many body theory;Kondo effect;Quantum interference
DOI: 10.1038/ncomms15210
Language: en
Status of Item: Peer reviewed
Appears in Collections:Physics Research Collection

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