Power fluctuations in an ac driven coherent conductor
Institute for Theory of Statistical Physics, RWTH Aachen University,
Germany, JARA-Fundamentals of Future Information Technology
Tuesday, 04 February 2014, 10:15
Single particle sources are time-periodically driven devices emitting a
controlled number of particles for each period. They are of key importance
in research fields as metrology and quantum electron optics , where
high emitting accuracy is required.
The precision of these devices is limited by the fluctuations due to
extra electron-hole excitations induced by the driving of the system
itself. One of the possible experimental realizations of a single
particles source is the application of a Lorentzian pulse to a conductor.
In special cases  this creates an ideal noiseless quantized particle
stream (Levitons) . The experimental attempts to reach this ideal case
have shown that adding one or more harmonic driving signal of different
frequency reduces the current fluctuations [4,5].
The fluctuations related to the electron-hole excitations triggered the
interest in the characteristics of the energy transport of these systems.
Thus in order to complement the charge transport investigation  we
study the energy transport properties of a coherent conductor when
subjected to different signals. In particular we considered the
contribution of the electron-hole like excitations to the heat current
and the low frequency heat . We finally relate these quantities to the
power supplied to the system .
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