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Are better conductors more rigid?

Eom, Young-Ho and Jeong, Hawoong and Orland, Henri and Yi, Juyeon Are better conductors more rigid? EPL (Europhysics Letters), 76 (2). pp. 325-331. ISSN 0295-5075 (2007)

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The variation of the bending stiffness of various materials is studied from the point of view of the electronic band characteristics. As far as the electronically generated bending stiffness κe (which we refer to as electro-stiffness) is concerned, the relevant factors are the orbital overlap t, the gap width u between the valence band and the conduction band, and the electron filling fraction γ. A perturbative calculation leads to the approximate expression κe ~ t2/√u2 + t2. This shows that materials with a large overlap and narrow band gap should be stiffer. The electro-stiffness also depends on the electron filling-fraction. We find that κe(γ) ≤ κe(1/2). These kinds of behavior are confirmed by numerical calculations. In addition, we study the variation in the projected length of flexible molecules under a voltage bias. The nonlinear variation of the bending rigidity is shown to give rise to a length contraction or dilation, depending on the voltage bias.

Item Type: Article
Identification Number: 10.1209/epl/i2006-10257-7
Uncontrolled Keywords: PACS: 72.80.Le Polymers; organic compounds (including organic semiconductors) - 82.35.Cd Conducting polymers - 77.65.Bn Piezoelectric and electrostrictive constants
Subjects: Q Science > QC Physics
Research Area: Computer Science and Applications
Depositing User: Ms T. Iannizzi
Date Deposited: 02 Dec 2014 14:58
Last Modified: 18 Dec 2014 13:57
URI: http://eprints.imtlucca.it/id/eprint/2381

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