One-way rotation of a molecule-rotor driven by a shot noise

The shot noise of a tunneling current passing through a molecule-motor can sustain a one-way rotation when populating the molecular excited states by tunneling inelastic excitations. We demonstrate that a ratchet-like ground state rotation potential energy curve is not necessary for the rotation to...

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Bibliographic Details
Published inNanoscale Vol. 6; no. 5; pp. 2793 - 2799
Main Authors Echeverria, Jorge, Monturet, Serge, Joachim, Christian
Format Journal Article
LanguageEnglish
Published England Royal Society of Chemistry 01.01.2014
Subjects
Excitation
Ground state
Grounds
Nanostructure
Physics
Potential energy
Rotor speed
Shot noise
Tunneling
shot noise
rotation mechanism
Single molecule motor
excited states
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Summary:The shot noise of a tunneling current passing through a molecule-motor can sustain a one-way rotation when populating the molecular excited states by tunneling inelastic excitations. We demonstrate that a ratchet-like ground state rotation potential energy curve is not necessary for the rotation to occur. A relative shift in energy difference between the maxima of this ground state and the minima of the excited states is the necessary condition to get to a unidirectional rotation. The rotor speed of rotation and its rotation direction are both controlled by this shift, indicating the necessity of a careful design of both the ground and excited states of the next generation of molecule-motors to be able to generate a motive power at the nanoscale.
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ISSN:2040-3364
2040-3372
DOI:10.1039/c3nr05814j