Quantum Electronic Devices

Welcome to the web page of the Quantum Electronic Devices group in UNSW's School of Physics


QED group May 2016

The QED group

The Quantum Electronic Devices group is part of the Condensed Matter department in UNSW's School of Physics in the heart of Sydney. We are also associated with the Australian Research Council Centre of Excellence for Future Low Energy Electronics Technologies.
Our research examines the fundamental properties of low dimensional systems realised in advanced semiconductor devices, and the development of new semiconductor and superconducting devices.

What's new

8 June 2017
Four fridges cold! We have all four dilution fridges cold, running lots of cool experiments.
5 May 2017
Jo-Tzu and Elizabeth's paper on the theory of spin-bloackade of holes in quantum dots been accepted for publication in PRB: "Spin blockade in hole quantum dots: Tuning exchange electrically and probing Zeeman interactions", J.T. Hung, E. Marcellina, B. Wang, A. R. Hamilton, and D. Culcer, Phys. Rev. B 95, 195316 (2017), https://doi.org/10.1103/PhysRevB.95.195316.
10 Apr 2017
Scott and Daisy have gone to Denmark to conduct experiments at the Centre for Quantum Devices in the Niels Bohr Institute at the University of Copenhagen. Have a great trip!
5 Apr 2017
Well done to Ashwin, Dima and Karina; their paper showing that we can detect the signatures of Rashba and Dresselhaus spin-orbit interactions in hole quantum point contacts, and even control their interplay by changing the substrate orientation, has just been published in Physical Review Letters: "Detection and Control of Spin-Orbit Interactions in a GaAs Hole Quantum Point Contact", A. Srinivasan, D. S. Miserev, K. L. Hudson, O. Klochan, K. Muraki, Y. Hirayama, D. Reuter, A. D. Wieck, O. P. Sushkov, and A. R. Hamilton, Phys. Rev. Lett. 118, 146801 (2017). https://doi.org/10.1103/PhysRevLett.118.146801 with a preprint here: https://arxiv.org/abs/1703.04233.
1 Feb 2017
The new fridge, which we are thinking will either be called Dreadnought or Leviathan, cools below 7mK.
17 Jan 2017
Congratulations to Elizabeth on her first paper! Her work on the theory of 2D hole systems in heterojunction devices in different material systems has been accepted for PRB and chosen as an Editor's choice: "Spin-orbit interactions in inversion-asymmetric two-dimensional hole systems: A variational analysis", E. Marcellina, A. R. Hamilton, R. Winkler, and Dimitrie Culcer, to appear in Phys Rev B. Preprint is here https://arxiv.org/abs/1604.08759.
23 Jan 2017
Installation of our new fridge has started - see BlueForsxLDFridgeInstallationTimelapse for details.
24 Nov 2016
Well done to Daisy, whose paper reporting the first measurements of anisotropic spin blockade in a spin-3/2 heavy hole system has just been accepted for publication in Nano Letters: D.Q. Wang, O. Klochan, J-T Hung, D. Culcer, I. Farrer, D.A. Ritchie, and .R. Hamilton, Anisotropic Pauli Spin Blockade of Holes in a GaAs Double Quantum Dot, Nano Lett., accepted: November 24, (2016). http://dx.doi.org/10.1021/acs.nanolett.6b03752
8 Sept 2016
Congratulations to Oleh Klochan, Oleg Sushkov, Dimi Culcer and Alex Hamilton in the School of Physics, as well as Jan Seidel and Nagarajan Valanoor in the School of Materials Science and Engineering, on the successful ARC Centre of Excellence in Future Low Energy Electronics Technologies (FLEET). The Centre will receive $33M in ARC funding over the next 7 years. It is headquartered at Monash University, with a major presence at UNSW, and will develop the scientific foundations for fundamentally new types of electronic conduction based on topological properties of matter, with potential for future low energy electronics technologies.
18 July 2016
Well done to Ashwin, Karina and Dima - their paper reporting a direct measurement of the magnitude and sign of the g-factor of holes in a quantum point contact has just appeared as a Rapid Communication in Physical Review B: A. Srinivasan, K. L. Hudson, D. Miserev, L. A. Yeoh, O. Klochan, K. Muraki, Y. Hirayama, O. P. Sushkov, and A. R. Hamilton, Electrical control of the sign of the g factor in a GaAs hole quantum point contact, Phys. Rev. B 94, 041406(R) (2016). http://dx.doi.org/10.1103/PhysRevB.94.041406
8 July 2016
Congratulations to Daisy Wang and Oleh Klochan - their paper on a novel double layer gate architecture for making hole quantum dots has just been published: D Q Wang, A R Hamilton, I Farrer, D A Ritchie and O Klochan, Double-layer-gate architecture for few-hole GaAs quantum dots, Nanotechnology 27, 334001 (2016). http://dx.doi.org/10.1088/0957-4484/27/33/334001
17 May 2016
Congratulations to Golrokh Akhgar (LaTrobe), Oleh Klochan (UNSW) and Chris Pakes' diamond team at LaTrobe University: their paper reporting that it is possible to tune the strength of the spin-orbit interaction of 2D holes in surface conducting diamond transistors, has just been accepted by Nano Letters: Strong and Tunable Spin–Orbit Coupling in a Two-Dimensional Hole Gas in Ionic-Liquid Gated Diamond Devices, G. Akhgar, O. Klochan, L.H. Willems van Beveren, M.T. Edmonds, F. Maier, B.J. Spencer, J.C. McCallum, L. Ley, A.R. Hamilton, and C.I. Pakes, Nano Letters (in press, 2016). See http://dx.doi.org/10.1021/acs.nanolett.6b01155.
25 April 2016
Congratulations to Tommy Li and LaReine Yeoh - their paper reporting the observation of non-adiabatic spin dynamics (equivalent to a non-abelian Berry phase) in a 2D hole system has just been accepted for publication: Manifestation of a non-Abelian Berry phase in a p-type semiconductor system, T. Li, L.A. Yeoh, A. Srinivasan, O. Klochan, D. A. Ritchie, M.Y. Simmons, O.P. Sushkov, and A.R. Hamilton, Physical Review B 93, 205424 (2016). See http://dx.doi.org/10.1103/PhysRevB.93.205424
11 Mar 2016
Elizabeth Marcellina is off to Baltimore to present her work at the 2016 March Meeting of the American Physical Society.
29 Feb 2016
Welcome to new Honours student Jarrod Adam.
31 Jan 2016
Congratulations to Dr. Daisy Wang !
28 Jan 2016
Congratulations to Matt Rendell, whose paper on magnetic focussing of holes has been selected by the Editorial Board as one of the Semiconductor Science and Technology Highlights of 2015.
18 Jan 2016
Welcome to two new group members: Honours student Yonatan, and undergraduate vacation scholar Isaac.
7 Jan 2016
Congratulations to Dr. Roy Li !

Topic revision: r54 - 07 Jun 2017, AlexHamilton