Excited-state spectroscopy on a quantum dot side-coupled to a quantum wire

TL;DR

This paper presents a method for excited-state spectroscopy of a quantum dot coupled to a quantum wire, enabling precise energy measurements and observation of orbital and Zeeman splittings.

Contribution

The study introduces a voltage pulse technique for accurate energy calibration and excited-state detection in a quantum dot-wire system.

Findings

Observation of orbital excited state in the quantum dot

Detection of Zeeman splitting in the system

Accurate energy estimation method developed

Abstract

We report excited-state spectroscopy on a quantum dot side-coupled to a quantum wire with accurate energy estimation. Our method utilizes periodic voltage pulses on the dot, and the energy calibration is performed with reference to the bias voltage across the wire. We demonstrate the observation of the orbital excited state and the Zeeman splitting in a single dot.