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Effect of phonons on the ac conductance of molecular junctions.

Ueda A, Entin-Wohlman O, Aharony A - Nanoscale Res Lett (2011)

Bottom Line: We theoretically examine the effect of a single phonon mode on the structure of the frequency dependence of the ac conductance of molecular junctions, in the linear response regime.The conductance is enhanced (suppressed) by the electron-phonon interaction when the chemical potential is below (above) the energy of the electronic state on the molecule.PACS numbers: 71.38.-k, 73.21.La, 73.23.-b.

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Affiliation: Department of Physics, Ben Gurion University, Beer Sheva 84105, Israel. akiko@bgu.ac.il.

ABSTRACT
We theoretically examine the effect of a single phonon mode on the structure of the frequency dependence of the ac conductance of molecular junctions, in the linear response regime. The conductance is enhanced (suppressed) by the electron-phonon interaction when the chemical potential is below (above) the energy of the electronic state on the molecule.PACS numbers: 71.38.-k, 73.21.La, 73.23.-b.

No MeSH data available.


Related in: MedlinePlus

The ac conductance as a function of (ε0 - μ). The ac frequency ω = Γ. ΓL = ΓR and δμL = -δμR. Solid line: without e-ph interaction. Dotted line: γ = 0.3Γ and ω0 = Γ.
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Figure 1: The ac conductance as a function of (ε0 - μ). The ac frequency ω = Γ. ΓL = ΓR and δμL = -δμR. Solid line: without e-ph interaction. Dotted line: γ = 0.3Γ and ω0 = Γ.

Mentions: The total conductance is given by G = G0 + Gint, where G0 is the ac conductance without the e-ph interaction, while Gint ≡ GH + Gex contains the Hartree contribution GH and the exchange term Gex. Figure 1 shows the conductance G as a function of ε0 - μ, for a fixed ac frequency ω = 0.5Γ. The solid line indicates G0. The dotted line shows the full conductance G, with γ = 0.3Γ. The peak becomes somewhat narrower, and it is shifted to higher energy, which implies a lower (higher) conductance for ε0 < μ (ε0 > μ). However, no additional peak structure appears.


Effect of phonons on the ac conductance of molecular junctions.

Ueda A, Entin-Wohlman O, Aharony A - Nanoscale Res Lett (2011)

The ac conductance as a function of (ε0 - μ). The ac frequency ω = Γ. ΓL = ΓR and δμL = -δμR. Solid line: without e-ph interaction. Dotted line: γ = 0.3Γ and ω0 = Γ.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211260&req=5

Figure 1: The ac conductance as a function of (ε0 - μ). The ac frequency ω = Γ. ΓL = ΓR and δμL = -δμR. Solid line: without e-ph interaction. Dotted line: γ = 0.3Γ and ω0 = Γ.
Mentions: The total conductance is given by G = G0 + Gint, where G0 is the ac conductance without the e-ph interaction, while Gint ≡ GH + Gex contains the Hartree contribution GH and the exchange term Gex. Figure 1 shows the conductance G as a function of ε0 - μ, for a fixed ac frequency ω = 0.5Γ. The solid line indicates G0. The dotted line shows the full conductance G, with γ = 0.3Γ. The peak becomes somewhat narrower, and it is shifted to higher energy, which implies a lower (higher) conductance for ε0 < μ (ε0 > μ). However, no additional peak structure appears.

Bottom Line: We theoretically examine the effect of a single phonon mode on the structure of the frequency dependence of the ac conductance of molecular junctions, in the linear response regime.The conductance is enhanced (suppressed) by the electron-phonon interaction when the chemical potential is below (above) the energy of the electronic state on the molecule.PACS numbers: 71.38.-k, 73.21.La, 73.23.-b.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Physics, Ben Gurion University, Beer Sheva 84105, Israel. akiko@bgu.ac.il.

ABSTRACT
We theoretically examine the effect of a single phonon mode on the structure of the frequency dependence of the ac conductance of molecular junctions, in the linear response regime. The conductance is enhanced (suppressed) by the electron-phonon interaction when the chemical potential is below (above) the energy of the electronic state on the molecule.PACS numbers: 71.38.-k, 73.21.La, 73.23.-b.

No MeSH data available.


Related in: MedlinePlus