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Journal of Chemical Physics / Volume 123 / Issue 18 / ARTICLES / Surfaces, Interfaces, and Materials

J. Chem. Phys. 123, 184702 (2005); http://dx.doi.org/10.1063/1.2107527 (5 pages)

Current-induced rotation of helical molecular wires

Petr Král1 and Tamar Seideman2

1Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607
2Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113

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(Received 29 November 2004; accepted 9 September 2005; published online 4 November 2005)

We show that electric current running through a nanojunction with a biased helical molecule can induce unidirectional rotation of the molecular component. In an electric field, conduction electrons injected into the molecule are accelerated along the helical path going through its body, thereby gaining directed angular momentum. Conservation laws require that an angular momentum of the same size but opposite sense is imparted to the rigid-body rotation of the helix. We describe the angular momentum exchange processes that underlie the operation of the nanorotor, discuss factors limiting its efficiency, and propose potential applications.

© 2005 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. MODEL
  3. ANGULAR MOMENTUM EXCHANGE DYNAMICS
  4. APPROXIMATIONS AND NUMERICAL RESULTS
  5. SPINNING RATE
  6. CONCLUSION

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KEYWORDS and PACS

Keywords

electrical conductivity, electric field effects

PACS

  • 73.40.-c

    Electronic transport in interface structures

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2107527

PUBLICATION DATA

ISSN

0021-9606 (print)  
1089-7690 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    P. Král and D. Tománek, Phys. Rev. Lett. 82, 5373 (1999).

    P. Král and H. R. Sadeghpour, Phys. Rev. B 65, 161401(R) (2002)
    I. Thanopulos, P. Král, and M. Shapiro, Phys. Rev. Lett. 92, 113003 (2004).

    C.-C. Kaun and T. Seideman, Phys. Rev. Lett. 94, 226801 (2005).

    D. N. Lang, Phys. Rev. Lett. 55, 230 (1985).

    G. Timp, H. U. Baranger, P. deVegvar, J. E. Cunningham, R. E. Howard, R. Behringer, and P. M. Mankiewich, Phys. Rev. Lett. 60, 2081 (1988).

    P. Král, Phys. Rev. B 53, 11034 (1996).

    G. Chen, Phys. Rev. B 57, 14958 (1998).


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