Are better conductors more rigid?

Young Ho Eom, Hawoong Jeong, Henri Orland, Juyeon Yi

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


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/√ u 2 + 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.

Original languageEnglish
Pages (from-to)325-331
Number of pages7
JournalEurophysics Letters
Issue number2
StatePublished - 15 Oct 2006


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