Coherent backscattering from a quantum dot is insensitive to the Ehrenfest time

TL;DR

This withdrawn paper aimed to demonstrate that coherent backscattering from a quantum dot does not depend on the Ehrenfest time, using large-scale computer simulations, but was retracted due to issues with the underlying assumptions.

Contribution

The paper attempted to provide conclusive evidence for Ehrenfest-time-independence of coherent backscattering through large-scale simulations, challenging previous assumptions.

Findings

Simulation showed insensitivity of backscattering to Ehrenfest time

Authors withdrew the paper after re-evaluation of the methodology

Highlighted limitations of linking weak localization directly to coherent backscattering

Abstract

This paper was withdrawn by the authors. The purpose of this paper was to provide conclusive evidence for the Ehrenfest-time-independence of weak localization, by means of a computer simulation of the coherent backscattering peak on very large systems. (Two orders of magnitude larger than we could reach in cond-mat/0405122 by studying weak localization directly.) We have decided to withdraw this paper, after Piet Brouwer convinced us that the one-to-one correspondence between weak localization and coherent backscattering can not be relied upon. For example, a reflection matrix with one half of its eigenvalues equal to 0 and the other half equal to 1 (hence without weak localization) would still show a coherent backscattering peak in a basis that is randomly related to its eigenbasis.