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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

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Published on: June 3, 2015

Quantitative estimation of exchange interaction energy using two-electron vertical double quantum dots.

T Kodera¹, K Ono, Y Kitamura

¹Institute for Nano Quantum Information Electronics, the University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan. kodera@iis.u-tokyo.ac.jp

Physical Review Letters

|April 28, 2009

Summary

We quantitatively estimate exchange energy (J) in quantum dots using Pauli-spin blockade. This method reveals J

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Area of Science:

Quantum physics
Condensed matter physics
Quantum computing

Background:

Pauli-spin blockade is a phenomenon in quantum dots.
Hyperfine coupling can lift spin blockade.
Exchange energy (J) is crucial for quantum information processing.

Purpose of the Study:

To quantitatively estimate the exchange energy (J) in two-electron vertical double quantum dots.
To investigate the influence of interdot level detuning (Delta) on J.
To compare experimental results with theoretical calculations.

Main Methods:

Utilizing Pauli-spin blockade in two-electron vertical double quantum dots.
Observing the singlet-triplet (S-T) transition mediated by hyperfine coupling.
Analyzing the lifting of spin blockade due to Zeeman energy compensation.

Main Results:

Exchange energy (J) was quantitatively estimated across a range of interdot level detuning (Delta).
The singlet-triplet (S-T) transition, mediated by hyperfine coupling, was observed to lift Pauli-spin blockade.
Experimental data for J versus Delta, including resonance effects, were accurately reproduced by Hubbard model calculations.

Conclusions:

Pauli-spin blockade provides a quantitative method for determining exchange energy (J).
Hyperfine coupling and Zeeman energy play critical roles in spin blockade dynamics.
Hubbard model calculations effectively describe the exchange energy in double quantum dot systems.