Quantum Transport in Presence of Bound States -- Noise Power

TL;DR

This paper investigates how bound states influence noise power in quantum transport, revealing that bound states significantly modify noise characteristics and are detectable through their impact on noise spectra.

Contribution

It provides an exact expression for the bound state contribution to noise power and compares it to scattering states, highlighting their distinct effects.

Findings

Bound states affect noise power at frequencies below their energies.

Bound states cause specific modifications in the frequency dependence of noise.

Theoretical predictions are discussed with potential experimental implications.

Abstract

The impact of bound states in Landauer-Buttiker scattering approach to non-equilibrium quantum transport is investigated. We show that the noise power at frequency $\nu$ is sensitive to all bound states with energies $\omega_b$ satisfying $|\omega_b| < \nu$. We derive the exact expression of the bound state contribution and compare it to the one produced by the scattering states alone. It turns out that the bound states lead to specific modifications of both space and frequency dependence of the total noise power. The theoretical and experimental consequences of this result are discussed.