Efficient semiclassical approach for time delays

TL;DR

This paper introduces a new semiclassical method for analyzing time delays in chaotic quantum systems, improving upon previous models by avoiding energy derivatives and extending the understanding of time-delay statistics.

Contribution

A novel semiclassical approach to the Wigner time delay matrix that bypasses energy derivatives and extends statistical analysis for chaotic cavities.

Findings

Established universality of moment generating functions up to third order.

Derived semiclassical results for higher-order moments.

Proved equivalence between random matrix theory and semiclassical predictions.

Abstract

The Wigner time delay, defined by the energy derivative of the total scattering phase shift, is an important spectral measure of an open quantum system characterising the duration of the scattering event. It is related to the trace of the Wigner-Smith matrix Q that also encodes other time-delay characteristics. For chaotic cavities, these exhibit universal fluctuations that are commonly described within random matrix theory. Here, we develop a new semiclassical approach to the time-delay matrix which is formulated in terms of the classical trajectories that connect the exterior and interior regions of the system. This approach is superior to previous treatments because it avoids the energy derivative. We demonstrate the method's efficiency by going beyond previous work in studying the time-delay statistics for chaotic cavities with perfectly connected leads. In particular, the universality for moment generating functions of the proper time-delays (eigenvalues of Q) is established up to third order in the inverse number of scattering channels for systems with and without time-reversal symmetry. Semiclassical results are then obtained for a further two orders. We also show the equivalence of random matrix and semiclassical results for the second moments and for the variance of the Wigner time delay at any channel number.