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Adiabatic quantum pump in the presence of external ac voltages
M. Moskalets, M. Buttiker
We investigate a quantum pump which in addition to its dynamic pump parameters is subject to oscillating external potentials applied to the contacts of the sample. Of interest is t…
Magnetic Field Symmetry of Dynamic Capacitances
T. Christen, M. Buttiker
While the static capacitance matrix is always symmetric and thus an even function of the magnetic field, the dynamic capacitance matrix of multi-terminal samples obeys in general o…
Mesoscopic Capacitors: A Statistical Analysis
Victor A. Gopar, Pier A. Mello, Markus Buttiker
The capacitance of mesoscopic samples depends on their geometry and physical properties, described in terms of characteristic times scales. The resulting ac admittance shows sample…
Gauge invariant nonlinear electric transport in mesoscopic conductors
T. Christen, M. Buttiker
We use the scattering approach to investigate the nonlinear current-voltage characteristic of mesoscopic conductors. We discuss the leading nonlinearity by taking into account the…
Partial Densities of States, Scattering Matrices, and Green's Functions
V. Gasparian, T. Christen, M. Buttiker
The response of an arbitrary scattering problem to quasi-static perturbations in the scattering potential is naturally expressed in terms of a set of local partial densities of sta…
Low frequency admittance of a quantum point contact
T. Christen, M. Buttiker
We present a current and charge conserving theory for the low frequency admittance of a quantum point contact. We derive expressions for the electrochemical capacitance and the dis…