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Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

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Published on: November 1, 2013

Pauli spin blockade in a highly tunable silicon double quantum dot.

N S Lai¹, W H Lim, C H Yang

¹ARC Centre of Excellence for Quantum Computation and Communication Technology, School of Electrical Engineering & Telecommunications, The University of New South Wales, Sydney 2052, Australia. ns.lai@student.unsw.edu.au

Scientific Reports

|February 23, 2012

Summary

Engineered silicon double quantum dots enable control of quantum information. Researchers observed Pauli spin blockade, paving the way for advanced singlet-triplet qubits.

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Area of Science:

Quantum Computing
Solid-State Physics
Materials Science

Background:

Double quantum dots are promising solid-state platforms for quantum information encoding.
Pauli spin blockade, based on the Pauli exclusion principle, allows detection and manipulation of two-electron spin states.
Isotopic purification in silicon can create environments free of nuclear spins, crucial for preserving coherent spin states.

Purpose of the Study:

To engineer and investigate a gate-defined silicon metal-oxide-semiconductor double quantum dot system.
To demonstrate and characterize Pauli spin blockade in this system.
To assess the potential for realizing singlet-triplet qubits.

Main Methods:

Fabrication of a gate-defined silicon metal-oxide-semiconductor double quantum dot.
Independent electrostatic tuning of electron occupancy and inter-dot tunnel coupling.
Measurement of Pauli spin blockade and singlet-triplet splitting.
Analysis of leakage current's magnetic field dependence.

Main Results:

Clear observation of Pauli spin blockade at weak inter-dot coupling.
Measurement of a large intra-dot singlet-triplet splitting exceeding 1 meV.
Observation of peculiar magnetic field dependence in leakage current, attributed to spin-flip cotunneling.

Conclusions:

The engineered silicon double quantum dot system effectively demonstrates Pauli spin blockade.
The observed phenomena, particularly spin-flip cotunneling effects, provide insights into spin dynamics.
The system shows excellent prospects for the realization of singlet-triplet qubits.