Coverage for kwant/physics/noise.py : 87%

Hot-keys on this page
r m x p toggle line displays
j k next/prev highlighted chunk
0 (zero) top of page
1 (one) first highlighted chunk
# Copyright 2011-2013 Kwant authors. # # This file is part of Kwant. It is subject to the license terms in the file # LICENSE.rst found in the top-level directory of this distribution and at # http://kwant-project.org/license. A list of Kwant authors can be found in # the file AUTHORS.rst at the top-level directory of this distribution and at # http://kwant-project.org/authors.
r"""Compute the shot-noise in a two-terminal setup.
In a two terminal system the shot noise is given by `tr((1 - t*t^\dagger) * t*t^\dagger)`.
Parameters ---------- smatrix : `~kwant.solvers.common.SMatrix` instance A two terminal scattering matrix.
Returns ------- noise : float Shot noise measured in noise quanta `2 e^3 |V| / pi hbar`. """
raise NotImplementedError("Noise expressions in terms of Green's " "functions are not implemented.")
# A general multi-terminal routine for noise would need to also have the # voltages at various leads as input. (See # http://arxiv.org/abs/cond-mat/9910158) It could still be based on # smatrix._a_ttdagger_a_inv, i.e. be also valid also for self-energy leads, # provided that only true transmission blocks are used. As long as nobody needs # it though, it does make little sense to make such a routine. |