Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 114: Transport: Molecular Electronics (jointly with CPP, HL, MA, O)

TT 114.3: Talk

Friday, March 20, 2015, 10:00–10:15, H 0110

A scaling relation in the vibronic contribution to the current noise — •Yoshihiro Asai — AIST, Tsukuba, Japan

The electron-phonon coupling effect on the electric current noise is studied based on the fully self-consistent theory of electron and phonon currents (SCEPC) given in terms of the Keldysh Greens function method [1], which has been successful in describing the local heating phenomena [2] and the temperature dependence of the electric conductance [3,4]. Based on the theoretical result on the noise accompanying the vibronic current, we will discuss a scaling relation between the two quantities derived from the current noise and the electric conductance at finite bias voltage. We found that the scaling relation holds when the dynamics of the electron satisfies a specific condition. We will describe these in the talk.

[1] Y. Asai, Phys. Rev. B 78, 045434-1-24 (2008).

[2] Y. Asai, Phys. Rev. B, 84, 085436-1-7 (2011).

[3] S.-K. Lee, R. Yamada, S.Tanaka, G.-S. Chang, Y. Asai,

and H. Tada, ACS Nano, 6, 5078-5082 (2012).

[4] Y. Asai, Phys. Rev. B 86, 201405(R)-1-4 (2012).