The Addition Spectrum of a Lateral Dot from Coulomb and Spin Blockade Spectroscopy

TL;DR

This paper presents a novel lateral quantum dot device that combines Coulomb and spin blockade spectroscopy to analyze charge and spin properties of electrons, providing detailed addition spectra and a new method to probe 2DEG edges.

Contribution

The study introduces a new lateral dot design enabling simultaneous Coulomb and spin blockade measurements, advancing the analysis of electron addition spectra and spin properties.

Findings

Successfully measured Coulomb blockade for up to 50 electrons.

Demonstrated spin blockade spectroscopy with magnetic edge states.

Used single-electron dot as a local probe of 2DEG edges.

Abstract

Transport measurements are presented on a class of electrostatically defined lateral dots within a high mobility two dimensional electron gas (2DEG). The new design allows Coulomb Blockade(CB) measurements to be performed on a single lateral dot containing 0, 1 to over 50 electrons. The CB measurements are enhanced by the spin polarized injection from and into 2DEG magnetic edge states. This combines the measurement of charge with the measurement of spin through spin blockade spectroscopy. The results of Coulomb and spin blockade spectroscopy for first 45 electrons enable us to construct the addition spectrum of a lateral device. We also demonstrate that a lateral dot containing a single electron is an effective local probe of a 2DEG edge.