title: Anisotropic Pauli Spin Blockade of Holes in a GaAs Double Quantum Dot.
abstract: Electrically defined semiconductor quantum dots are attractive systems for spin manipulation and quantum information processing. Heavy-holes in both Si and GaAs are promising candidates for all-electrical spin manipulation, owing to the weak hyperfine interaction and strong spin-orbit interaction. However, it has only recently become possible to make stable quantum dots in these systems, mainly due to difficulties in device fabrication and stability. Here, we present electrical transport measurements on holes in a gate-defined double quantum dot in a GaAs/AlxGa1-xAs heterostructure. We observe clear Pauli spin blockade and demonstrate that the lifting of this spin blockade by an external magnetic field is highly anisotropic. Numerical calculations of heavy-hole transport through a double quantum dot in the presence of strong spin-orbit coupling show quantitative agreement with experimental results and suggest that the observed anisotropy can be explained by both the anisotropic effective hole g-factor and the surface Dresselhaus spin-orbit interaction.
authors.affiliation: School of Physics, University of New South Wales, Sydney NSW 2052, Australia.
authors.forename: Daisy Q
authors.initials: DQ
authors.lastname: Wang
authors.affiliation: School of Physics, University of New South Wales, Sydney NSW 2052, Australia.
authors.forename: Oleh
authors.initials: O
authors.lastname: Klochan
authors.affiliation: School of Physics, University of New South Wales, Sydney NSW 2052, Australia.
authors.forename: Jo-Tzu
authors.initials: JT
authors.lastname: Hung
authors.affiliation: School of Physics, University of New South Wales, Sydney NSW 2052, Australia.
authors.forename: Dimitrie
authors.initials: D
authors.lastname: Culcer
authors.affiliation: Cavendish Laboratory, J. J. Thomson Avenue , Cambridge CB3 0HE, United Kingdom.
authors.forename: Ian
authors.initials: I
authors.lastname: Farrer
authors.affiliation: Cavendish Laboratory, J. J. Thomson Avenue , Cambridge CB3 0HE, United Kingdom.
authors.forename: David A
authors.initials: DA
authors.lastname: Ritchie
authors.affiliation: School of Physics, University of New South Wales, Sydney NSW 2052, Australia.
authors.forename: Alex R
authors.initials: AR
authors.lastname: Hamilton
keywords: III-V semiconductor; Pauli spin blockade; heavy hole; quantum dot; spin-orbit interaction