Coulomb blockade effect and negative differential resistance in the electronic transport of bacteriorhodopsin

Jong Yeob Kim, Sunbae Lee, Kyung Hwa Yoo, Du Jeon Jang

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

A functional protein of bacteriorhodopsin has been employed for an approach to develop molecular single-electron transistors. A purple-membrane nanofragment shows a characteristic, cyclic, and reproducible I-V curve having negative differential resistance and an on-off peak-to-valley ratio of 660. The conductance increases exponentially with temperature increase with an activation energy of 47 meV, comparable to the charging energy of a bacteriorhodopsin molecule. This with observed I-V scaling relationship indicates that the Coulomb blockade is the primary conductance-limiting feature and that charges are carried by arrayed Coulomb islands of bacteriorhodopsin.

Original languageEnglish
Article number153301
JournalApplied Physics Letters
Volume94
Issue number15
DOIs
Publication statusPublished - 2009 Apr 27

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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