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You searched for +publisher:"University of New South Wales" +contributor:("Klochan, Oleh, Physics, Faculty of Science, UNSW"). One record found.

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University of New South Wales

1. Wang, Qingwen. Hole Spins in GaAs Quantum Dots.

Degree: Physics, 2016, University of New South Wales

In this thesis, we report a new architecture for making lateral hole quantum dots based on shallow accumulation-mode AlGaAs/GaAs heterostructures. Utilizing a double-level-gate architecture, we demonstrate the operation of ultra-small single and double quantum dots in the few-hole regime using electrical measurements. Devices with different dimensions and layouts are tested to reach the single-hole limit. With the flexibility of the double-level-gate architecture, both single and double quantum dots can be formed within the same device with good tunability.With the ability to isolate a single heavy-hole spin, we study the Zeeman splitting of the orbital states in different field orientations via magnetospectroscopy measurements. The extracted value of the hole effective g-factor is found to strongly depend on the orbital state, and be highly anisotropic with respect to the magnetic field direction. We show that these peculiar behaviors of the heavy-hole spins can be qualitatively explained by the effects of strong spin-orbit coupling and strong Coulomb interactions in the hole system. By varying the dot size in situ, we also demonstrate the tuning of the g-factor anisotropy, and estimate the shape of electrically-defined quantum dot.With the few-hole double quantum dot, we present the first observation of Pauli spin blockade in GaAs hole quantum dots. Utilizing a vector field magnet system, we study the lifting of spin blockade due to the spin-orbit interaction. We found that the effect of spin-orbit coupling on spin blockade to be highly anisotropic in different magnetic field orientations, which agrees with previous theoretical predictions on systems with strong spin-orbit coupling. From the anisotropic lifting of spin blockade, we identify the orientation of the effective spin-orbit field to be along the transport direction, which is very different from experimental results on electron quantum dots and highlights the uniqueness of hole systems. Advisors/Committee Members: Hamilton, Alex, Physics, Faculty of Science, UNSW, Klochan, Oleh, Physics, Faculty of Science, UNSW.

Subjects/Keywords: Nanofabrication; Semiconductor; Nanostructure

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Wang, Q. (2016). Hole Spins in GaAs Quantum Dots. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/55452 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:37620/SOURCE02?view=true

Chicago Manual of Style (16th Edition):

Wang, Qingwen. “Hole Spins in GaAs Quantum Dots.” 2016. Doctoral Dissertation, University of New South Wales. Accessed October 17, 2019. http://handle.unsw.edu.au/1959.4/55452 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:37620/SOURCE02?view=true.

MLA Handbook (7th Edition):

Wang, Qingwen. “Hole Spins in GaAs Quantum Dots.” 2016. Web. 17 Oct 2019.

Vancouver:

Wang Q. Hole Spins in GaAs Quantum Dots. [Internet] [Doctoral dissertation]. University of New South Wales; 2016. [cited 2019 Oct 17]. Available from: http://handle.unsw.edu.au/1959.4/55452 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:37620/SOURCE02?view=true.

Council of Science Editors:

Wang Q. Hole Spins in GaAs Quantum Dots. [Doctoral Dissertation]. University of New South Wales; 2016. Available from: http://handle.unsw.edu.au/1959.4/55452 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:37620/SOURCE02?view=true

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