Spin blockade in hole quantum dots: Tuning exchange electrically and probing Zeeman interactions

Jo-Tzu Hung, Elizabeth Marcellina, Bin Wang, Alexander R. Hamilton, and Dimitrie Culcer
Phys. Rev. B 95, 195316 – Published 26 May 2017

Abstract

Spin-orbit coupling is key to all-electrical control of quantum-dot spin qubits, and is often much stronger for holes than for electrons. The recent development of high-quality hole nanostructures has generated considerable interest in hole-spin qubit architectures [C. Kloeffel and D. Loss, Annu. Rev. Condens. Matter Phys. 4, 51 (2013)]. Yet hole-spin quantum computing hinges on the ability to discriminate between competing Zeeman terms and on the understanding of the complex interplay between the Zeeman and spin-orbit interactions, which are probed via Pauli spin blockade. Here we investigate spin blockade for two heavy holes in a gated double quantum dot in an in-plane magnetic field B. We find that the leakage period as a function of the field orientation is critically dependent on the relative magnitude of Zeeman interaction terms linear and cubic in B, exhibiting a beat pattern when the two are comparable in magnitude, and providing an effective way to discriminate between the two. Moreover, in certain materials the singlet-triplet exchange splitting is highly tunable by an appropriate choice of field direction, yielding a straightforward control variable for quantum information processing. These findings should stimulate new experiments on hole qubits.

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  • Received 6 October 2016
  • Revised 28 April 2017

DOI:https://doi.org/10.1103/PhysRevB.95.195316

©2017 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Jo-Tzu Hung1, Elizabeth Marcellina1, Bin Wang1,2, Alexander R. Hamilton1, and Dimitrie Culcer1

  • 1School of Physics, The University of New South Wales, Sydney NSW 2052, Australia
  • 2University of Science and Technology of China, Hefei, Anhui, 230026, China

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Issue

Vol. 95, Iss. 19 — 15 May 2017

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