Effects of electromagnetic coupling on conductance switching of a gated tunnel junction

Adva Baratz, Alexander J. White, Michael Galperin, Roi Baer*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Using a combination of density functional theory and quantum master equations approach, we study the effect of electromagnetic (EM) coupling on the nonequilibrium steady-state behavior of a recently introduced gated molecular junction. This junction was demonstrated in a previous publication to exhibit sharp current switching near a certain critical DC field Ez, which induces intramolecular charge transfer, and here, we analyze the steady-state population and current when an AC EM field (EMF) is present. The AC EMF at frequency ω0 produces pronounced population and current features at gate fields Ez = Ez ± ω0/ez (where ez is the dipole of the charge-transfer state) and thus allows additional sharp switching capability at lower gate fields. We found that even when EMF is absent, the EM coupling itself changes the overall steady-state population and current distributions because it allows for relaxation via spontaneous emission.

Original languageAmerican English
Pages (from-to)3545-3550
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume5
Issue number20
DOIs
StatePublished - 16 Oct 2014

Bibliographical note

Publisher Copyright:
© 2014 American Chemical Society.

Keywords

  • exciton binding energy
  • gate-controlled conductance
  • laser-controlled conductance
  • molecular junctions
  • molecular switches
  • nonequilibrium transport
  • spontaneous emission

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