Spin blockade as a probe of Zeeman interactions in hole quantum dots

Abstract

Spin-orbit coupling is key to all-electrical control of quantum-dot spin qubits, and is frequently stronger for holes than for electrons. Here we investigate Pauli spin blockade for two heavy holes in a gated double quantum dot in an in-plane magnetic field. The interplay of the complex Zeeman and spin-orbit couplings causes a blockade leakage current anisotropic in the field direction. The period of the anisotropic leakage is critically dependent on the relative magnitude of Zeeman interaction terms linear and cubic in the magnetic field. The current and singlet-triplet exchange splitting can be effectively adjusted by an appropriate choice of field direction, providing a simple control variable for quantum information processing and a way of tailoring magnetic interactions in hole spin qubits.

arXiv comment8 pages including 5 figures and the appendix

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• Anisotropic Pauli Spin Blockade of Holes in a GaAs Double Quantum Dot
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• Strong influence of spin-orbit coupling on magnetotransport in two-dimensional hole systems
• Electrical control of the Zeeman spin splitting in two-dimensional hole systems
• Electrical operation of planar Ge hole spin qubits in an in-plane magnetic field
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• Phonon-assisted transport and hole-phonon coupling in GaAs double quantum dots