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Tuning the Kondo effect with a mechanically controllable break junction.

J J Parks¹, A R Champagne, G R Hutchison

¹Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA.

Physical Review Letters

|August 7, 2007

Summary

We investigated electron transport through C(60) molecules in the Kondo regime. Adjusting electrode spacing allowed tuning of the Kondo resonance, confirming predictions for the spin-1/2 Kondo problem.

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Area of Science:

Condensed matter physics
Quantum transport

Background:

The Kondo effect describes the scattering of conduction electrons by magnetic impurities.
Fullerenes, like C(60), are promising molecular systems for studying quantum phenomena.

Purpose of the Study:

To investigate electron transport through C(60) molecules in the Kondo regime.
To explore the tunability of Kondo resonance properties by controlling electrode spacing.

Main Methods:

Utilized a mechanically controllable break junction to create nanoscale gaps.
Studied electron transport through single C(60) molecules.
Varied electrode spacing to modify coupling and Kondo temperature.

Main Results:

Observed changes in Kondo resonance width and height with electrode spacing.
Demonstrated tunability of the Kondo temperature and electrode coupling strength.
Linear conductance measurements confirmed scaling behavior for the spin-1/2 Kondo problem.
Tuned finite-bias Kondo features related to C(60) vibrational modes.

Conclusions:

Electrode spacing is a critical parameter for controlling electron transport in molecular junctions.
Experimental results align with theoretical predictions for the Kondo effect in molecular systems.
C(60) molecules exhibit rich Kondo physics, including coupling to vibrational modes.