Modeling Electronic and Thermal Characteristics of Ge/Si-Core/Shell Nanowire Quantum Dot in the Coulomb Blockade Regime

TL;DR

This paper models the electronic and thermal transport properties of Ge/Si-Core/Shell nanowire quantum dots in the Coulomb blockade regime, highlighting their temperature dependence and sensitivity to reservoir coupling.

Contribution

It introduces a theoretical approach using the Luttinger-Kohn Hamiltonian to analyze valence band states and transport in Ge/Si nanowire quantum dots, aligning with experimental observations.

Findings

Transport characteristics match experimental data

Transport is sensitive to reservoir coupling

Quantum effects diminish with increasing temperature

Abstract

We investigate the transport characteristics of Ge/Si-Core/Shell nanowire with Coulomb Blockade in presence of external magneto-electric fields from a theoretical basis. Using the effective Luttinger-Kohn Hamiltonian we calculate the valence band energy states of the nanowire and find out the state density at mili-Kelvin temperature. We explore the current-voltage and conductance-voltage characteristics. The observed transport characteristics are in close agreement with experimental data. We find these characteristics to be sensitive to the coupling of the quantum dot with the reservoirs. The quantum nature of the characteristics becomes less prominent with increasing temperature, as expected.