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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Published on: August 2, 2019

Quantum interference effects in multi-channel correlated tunneling structures.

N S Maslova¹, V N Mantsevich², V N Luchkin³

¹Quantum Electronics Department, Quantum Technology Center, Faculty of Physics, Lomonosov Moscow State University, 119991, Moscow, Russia.

Scientific Reports

|September 4, 2021

Summary

This summary is machine-generated.

Quantum interference and Fano effects in multi-channel tunneling systems are altered by Coulomb interactions. On-site Coulomb interaction significantly changes tunneling conductance spectra, with bias voltage effects on occupation numbers playing a key role.

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Area of Science:

Condensed matter physics
Quantum mechanics
Nanoscale electronics

Background:

Quantum interference phenomena, such as the Fano effect, significantly influence tunneling conductance spectra in multi-channel systems.
The role of electron-electron interactions, specifically Coulomb interaction, in modifying these quantum interference effects requires further investigation.

Purpose of the Study:

To investigate the impact of Hubbard-type Coulomb interaction on tunneling conductance spectra in systems with localized interacting impurities or quantum dots.
To determine the primary factors governing the shape of tunneling conductance peaks in the presence of on-site Coulomb interactions.

Main Methods:

Theoretical modeling of multi-channel tunneling systems incorporating localized interacting impurity atoms or quantum dots.
Analysis of tunneling conductance spectra under varying conditions, including the presence of on-site Coulomb interaction and bias voltage.

Main Results:

The Fano shape of tunneling conductance spectra is strongly modified by the on-site Coulomb interaction.
The occupation numbers' dependence on bias voltage, particularly under non-equilibrium conditions, emerges as a dominant factor shaping the tunneling peaks, potentially overshadowing Fano interference effects.

Conclusions:

On-site Coulomb interaction fundamentally alters quantum interference effects in multi-channel tunneling systems.
Non-equilibrium effects related to bias voltage-dependent occupation numbers are crucial for understanding tunneling conductance spectra, challenging the sole attribution to Fano interference.