Temperature-dependent broadening of coherent current peaks in InAs double quantum dots

TL;DR

This study investigates how temperature affects the broadening of coherent current peaks in InAs double quantum dots, revealing strong temperature dependence influenced by substrate phonons and modeled with quantum dissipation.

Contribution

It provides a combined experimental and theoretical analysis of temperature-dependent broadening in quantum dot transport, highlighting the role of substrate phonons and quantum dissipation mechanisms.

Findings

Strong temperature dependence of coherent current peaks observed up to 20 K

Broadening modeled with quantum dissipation from substrate phonons

Magnetic field helps identify quantum dot states via temperature effects

Abstract

Quantum systems as used for quantum computation or quantum sensing are nowadays often realized in solid state devices as e.g. complex Josephson circuits or coupled quantum-dot systems. Condensed matter as an environment influences heavily the quantum coherence of such systems. Here, we investigate electron transport through asymmetrically coupled InAs double quantum dots and observe an extremely strong temperature dependence of the coherent current peaks of single-electron tunneling. We analyze experimentally and theoretically the broadening of such coherent current peaks up to temperatures of 20 K and we are able to model it with quantum dissipation being due to two different bosonic baths. These bosonic baths mainly originate from substrate phonons. Application of a magnetic field helps us to identify the different quantum dot states through their temperature dependence.