Designing a molecular switch with
bistable on/off states is of
particular interest in molecular electronics. Motivated by experimental
studies of molecular conductors, interplays of photons and electrons
and their effects on electrical properties are studied theoretically.
We have tried to model a molecular optical switch based on DNA sequences
of the hepatitis delta virus and Toxocara canis parasite.
The electrical response of chains to the light irradiation was examined
to optimize the function of an optical switch. The switch turns on
when the amplitude of incident irradiation and its frequency approach
to 0.3 at the unit of (ℏc)/(er
0) and 2 THz, respectively. We can modulate the switching
of the system via the simultaneous variation of effective factors
and obtain different islands in the parameter settings. The appearance
of different islands in the parameter surface relates to the on/off
states of electrical current, which can be verified and estimated
through the multifractal analysis.
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