Friday, May 3, 2013

1305.0314 (Fei Zhan et al.)

Power spectrum of fermionic heat current fluctuations    [PDF]

Fei Zhan, Sergey Denisov, Peter Hänggi
We analyze the fluctuations of an electronic heat current across an idealized molecular junction. Apart from an induced, finite inter-electrode heat current the focus will be on the spectral features of the resulting heat current fluctuations. By use of the Green function method we derive an explicit expression for the power spectral density of the emerging heat current fluctuations. The complex expression simplifies considerably in the limit of zero frequency, yielding the noise intensity of the heat current. This spectral density for the heat fluctuations still depends on the frequency in the zero-temperature limit, assuming different asymptotic behaviours in the low- and high-frequency regions. We further address some subtleties and open problems from an experimental viewpoint.
View original: http://arxiv.org/abs/1305.0314

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