# Fano Resonance in a cavity-reflector hybrid system

## TL;DR

This paper reports on the observation of Fano resonance in a hybrid quantum system comprising a quantum point contact and a reflector, highlighting its dependence on magnetic field and temperature, with potential applications in quantum information devices.

## Contribution

It demonstrates the experimental realization of Fano resonance in a cavity-reflector hybrid system and analyzes its behavior under magnetic field and temperature variations.

## Key findings

- Fano resonance observed at the 1D-2D transition
- Resonance weakens with increasing magnetic field and temperature
- Resonance shape depends strongly on reflector voltage

## Abstract

We present the results of transport measurements in a hybrid system consisting of an arch-shaped quantum point contact (QPC) and a reflector; together, they form an electronic cavity in between them. On tuning the arch-QPC and the reflector, asymmetric resonance peak in resistance is observed at the one-dimension to two-dimension transition. Moreover, a dip in resistance near the pinch-off of the QPC is found to be strongly dependent on the reflector voltage. These two structures fit very well with the Fano line shape. The Fano resonance was found to get weakened on applying a transverse magnetic field, and it smeared out at 100 mT. In addition, the Fano like shape exhibited a strong temperature dependence and gradually smeared out when the temperature was increased from 1.5 to 20 K. The results might be useful in realising device for quantum information processing.