News Column

Studies from Ist Nazl Fis Nuclear Further Understanding of Physics Research

February 18, 2014



By a News Reporter-Staff News Editor at Physics Week -- Current study results on Physics Research have been published. According to news reporting originating in Frascati, Italy, by VerticalNews journalists, research stated, "The force exerted by the electrons on the nuclei of a current-carrying molecular junction can be manipulated to engineer nanoscale mechanical systems. In the adiabatic regime a peculiarity of these forces is negative friction, responsible for Van der Pol oscillations of the nuclear coordinates."

The news reporters obtained a quote from the research from Ist Nazl Fis Nuclear, "In this work we study the robustness of the Van der Pol oscillations against high-frequency sources. For this purpose we go beyond the adiabatic approximation and perform full Ehrenfest dynamics simulations. The numerical scheme implements a mixed quantum-classical algorithm for open systems and is capable to deal with arbitrary time-dependent driving fields. We find that the Van der Pol oscillations are extremely stable. The nonadiabatic electron dynamics distorts the trajectory in the momentum-coordinate phase space but preserves the limit cycles in an average sense. We further show that high-frequency fields change both the oscillation amplitudes and the average nuclear positions."

According to the news reporters, the research concluded: "By switching the fields off at different times one obtains cycles of different amplitudes which attain the limit cycle only after considerably long times."

For more information on this research see: Nonadiabatic Van der Pol oscillations in molecular transport. European Physical Journal B, 2014;87(1):16-27. European Physical Journal B can be contacted at: Springer, 233 Spring St, New York, NY 10013, USA. (EDP Sciences - publications.edpsciences.org/; European Physical Journal B - epjb.edpsciences.org)

Our news correspondents report that additional information may be obtained by contacting A. Kartsev, Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Additional authors for this research include C. Verdozzi and G. Stefanucci.

Keywords for this news article include: Italy, Europe, Frascati, Physics Research

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Source: Physics Week


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