QED group December 2012 (Photo: Mike Gal)

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. Our research is focussed on studying the fundamental properties of low dimensional systems realised in advanced semiconductor devices, and developing new organic semiconductor and superconducting devices.

What's new

 

17 May 2013

Congratulations to Daisy Wang on getting her paper accepted into Physical Review B. Daisy has shown that you can try to remove disorder from ultra-clean devices, but there's no such thing as a free lunch: Influence of surface states on quantum and transport lifetimes in high-quality undoped heterostructures D. Q. Wang, J. C. H. Chen, O. Klochan, K. Das Gupta, D. Reuter,, y A.D. Wieck, D. A. Ritchie, and A. R. Hamilton.

 

15 May 2013

Welcome to PhD student Shun-Tsung Lo, visiting from Prof. Liang's group at the National Taiwan University. Shun-Tsung will be working with Oleh Klochan for the next 7 months on transport in atomically thin crystals.

 

3 May 2013

Congratulations to Oleh Klochan - his latest paper on the Kondo effect in hole quantum dots has just been accepted as a Rapid Communication in Physical Review B. The paper is a result of a really nice collaboration Oleh has set up with theorists in Germany, to compare experimental and theoretical finite temperature scaling of the zero bias conductance peak. The preprint is available here: Scaling of the Kondo zero-bias peak in a hole quantum dot at finite temperatures, by O. Klochan, A. P. Micolich, A. R. Hamilton, D. Reuter, A. D. Wieck, F. Reininghaus, M. Pletyukhov, H. Schoeller.

 

11 April 2013

A collaboration between the QED group and Andrew Dzurak's group in ANFF has demonstrated the first silicon single hole transistor using standard CMOS technology. The paper, "Single Hole Transport in a Silicon Metal-Oxide-Semiconductor Quantum Dot" by Roy Li, Fay Hudson, Andrew Dzurak and Alex Hamilton is available on the preprint archive.

 

7 April 2013

Andrew See is off to Italy, to attend the 2013 Capri Spring School on Transport in Nanostructures.

 

6 March 2013

Another paper in Physical Review Letters, this time with our collaborators in Italy. Our prediction of artificially engineered superfluidity of electron-hole pairs in graphene samples has just been accepted for publication. The preprint is available here: High Temperature Superfluidity in Double Bilayer Graphene, by Andrea Perali, David Neilson, and Alex Hamilton.

 

5 March 2013

Congratulations to Oleh Klochan and our collaborators in Cambridge: the paper "Ultra-shallow quantum dots in an undoped GaAs/AlGaAs 2DEG" by W. Y. Mak, F. Sfigakis, K. Das Gupta, O. Klochan, H. E. Beere, I. Farrer, J. P. Griffiths, G. A. C. Jones, A. R. Hamilton, and D. A. Ritchie has just been accepted for publication in Applied Physics Letters.

 

15 February 2013

Welcome to new Honours student Matthew Rendell.

 

21 January 2013

Mark Edmonds, from LaTrobe University, is visiting the QED group once more.

 

21 December 2012

Another paper in Nanoletters! Congratulations to Ashwin and LaReine on the acceptance of their paper "Using a tunable quantum wire to measure the large out-of-plane spin splitting of quasi two-dimensional holes in a GaAs nanostructure". Just in time for Christmas.

 

14 & 17 December 2012

The QED group is attending a two-day workshop, CMP at the Coogee Bay for Condensed Matter Physicists in the Sydney region. Anyone interested is welcome to attend this relaxed, no-fee workshop at the spectacular Coogee Bay Hotel. Registration is free.

Roy, Ashwin, Daisy, LaReine, Andrew and Oleh all gave excellent talks at the Coogee Bay workshop - well done.

 

13 December 2012

Daisy Wang and Alex Hamilton are giving talks at the 2012 AIP Congress in Sydney.

 

12 December 2012

Oleh Klochan is giving at talk on his measurements of the Kondo effect in hole systems at the COMMAD conference in Melbourne.

 

10-14 December 2012

Prof Barbaros Özyilmas, from the Graphene Research Centre at the National University of Singapore, is visiting the group.

 

3 December 2012

Alex Hamilton is awarded a UNSW Scientia Professorship, which is UNSW's most prestigious Professorship.

 

25 November 2013

Mark Edmonds, from LaTrobe University, is visiting the QED group to perform low temperature experiments on hole conduction at the surface of disingle crystal diamond. Better not lose that sample!

 

5 November 2012

QED group and collaborators win two large infrastructure grants.
Well done to our collaborator Dane McCamey at the University of Sydney, who has won an $860,000 grant for a new electron spin resonance system.

Prof Nagarajan Valanoor in the School of Materials Science and Engineering, Prof. Hamilton in QED and collaborators at UNSW at ISEM in Wollongong, have also won a $200,000 grant for a new characterisation facility for advanced materials and devices.

 

26-27 July 2012

Professor Michael Kelly FRS FReng from the University of Cambridge is visiting the group.

 

13 July 2012

Welcome to new Honours student Karina Hudson.

 

11 July 2012

Congratulations to Dr. Jason Chen on the award of his PhD.

 

4 July 2012

Last drinks gentlemen please! Today is Jason's last day at UNSW. He'll soon be heading off to join Professor Fujisawa's laboratory at the Tokyo Institute of Technology as a postdoctoral researcher. Drinks at the Rege....

 

23 May 2012

Much as we try to eliminate disorder in quantum devices, it is always there, and can sometimes have significant and unexpected effects, as this latest publication, in collaboration with the Universities of Oregon, Lund and Nottingham, shows:
Probing the sensitivity of electron wave interference to disorder-induced scattering in solid-state devices, B. C. Scannell, I. Pilgrim, A. M. See, et al, Physical Review B 85, 195319 (2012)

 

13 April 2012

Congratulations to Dr. Andrew See on the award of his PhD. Sounds like it's time to head for Drinks at the Rege....

 

31 March 2012

Another paper accepted for Physical Review Letters! Andrew See, Adam Micolich and co-workers show a new route to making incredibly stable quantum devices, and use magentoconductance fluctuations to provide a unique fingerprint of the random disorder in the device. Their results show for the first time that it is now possible to make devices behave identically before and after thermal cycling to room temperature.
"Impact of Small-Angle Scattering on Ballistic Transport in Quantum Dots" Phys. Rev. Lett. 108, 196807 (2012).

 

30 Jan 2012

Congratulations to Jason Chen and Daisy Wang - their paper "Fabrication and characterization of ambipolar devices on an undoped AlGaAs/GaAs heterostructure", in which they report a new way of making quantum devices that can be switched from electrons to holes simply by changing a gate bias, has appeared in Applied Physics Letters. A very interesting piece of work that shows how little we know about holes.

 

 

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