# Transparency enhancement in a double-barrier structure by the Fano antiresonance

## TL;DR

This paper demonstrates how a side-attached state in a double-barrier structure can induce narrow resonant peaks, significantly enhancing transparency through Fano antiresonance effects.

## Contribution

It reveals the interplay between Fano interference and size quantization, showing how they can produce near-perfect transmission even in asymmetric, strongly barriered structures.

## Key findings

- Narrow resonant peaks in transmission due to Fano antiresonance.
- High transmission close to unity in asymmetric setups.
- Interference effects enhance transparency despite barriers.

## Abstract

We show that the presence of a side-attached state strongly modifies the transmission through a one-dimensional double-barrier system in the window of wavevectors around the Fano antiresonance. Specifically, the interplay between the Fano interference and the size quantization inside the structure gives rise to narrow resonant peaks in the transmission coefficient. The height of the peaks may become close to unity (perfect transmission) even for an asymmetric setup with strong barriers, where the transmission coefficient in the absence of the Fano state is strongly suppressed at all other wavevectors. Thus, the two types of the interference phenomena, each by itself leading to the suppression of the transmission, conspire in a peculiar way to produce the transparency enhancement.