93 citations · 398 across the 15 of their papers we have counts for
15 papers
Statistical evaluation of 571 GaAs quantum point contact transistors showing the 0.7 anomaly in quantized conductance using millikelvin cryogenic on-chip multiplexing
Pengcheng Ma, Kaveh Delfanazari, Reuben K. Puddy +8
The mass production and the practical number of cryogenic quantum devices producible in a single chip are limited to the number of electrical contact pads and wiring of the cryosta…
Quantized conductance in split gate superconducting quantum point contacts with InGaAs semiconducting two-dimensional electron systems
Kaveh Delfanazari, Jiahui Li, Yusheng Xiong +11
Quantum point contact or QPC -- a constriction in a semiconducting two-dimensional (2D) electron system with a quantized conductance -- has been found as the building block of nove…
Large-scale on-chip integration of gate-voltage addressable hybrid superconductor-semiconductor quantum wells field effect nano-switch arrays
Kaveh Delfanazari, Jiahui Li, Peng Ma +10
Stable, reproducible, scalable, addressable, and controllable hybrid superconductor-semiconductor (S-Sm) junctions and switches are key circuit elements and building blocks of gate…
Experimental evidence for topological phases in the magnetoconductance of 2DEG-based hybrid junctions
Kaveh Delfanazari, Llorenc Serra, Pengcheng Ma +9
While the application of out-of-plane magnetic fields was, so far, believed to be detrimental for the formation of Majorana phases in artificially engineered hybrid superconducting…
Engineering of Microfabricated Ion Traps and Integration of Advanced On-Chip Features
Zak David Romaszko, Seokjun Hong, Martin Siegele +4
Trapped atomic ions are a proven and powerful tool for the fundamental research of quantum physics. They have emerged in recent years as one of the most promising candidates for se…
Experimental realization of a quantum dot energy harvester
G. Jaliel, R. K. Puddy, R. Sánchez +6
We demonstrate experimentally an autonomous nanoscale energy harvester that utilises the physics of resonant tunnelling quantum dots. Gate defined quantum dots on GaAs/AlGaAs high-…
Observation of Coulomb blockade in nanostructured epitaxial bilayer graphene on SiC
Cassandra Chua, Arseniy Lartsev, Jinggao Sui +9
We study electron transport in nanostructures patterned in bilayer graphene patches grown epitaxially on SiC as a function of doping, magnetic field, and temperature. Away from cha…
Unravelling Quantum Dot Array Simulators via Singlet-Triplet Measurements
Johnnie Gray, Abolfazl Bayat, Reuben K. Puddy +2
Recently, singlet-triplet measurements in double dots have emerged as a powerful tool in quantum information processing. In parallel, quantum dot arrays are being envisaged as anal…
Multiplexed Charge-locking Device for Large Arrays of Quantum Devices
R. K. Puddy, L. W Smith, H. Al-Taie +7
We present a method of forming and controlling large arrays of gate-defined quantum devices. The method uses a novel, on-chip, multiplexed charge-locking system and helps to overco…
Direct Imaging of Coherent Quantum Transport in Graphene Heterojunctions
E. D. Herbschleb, R. K. Puddy, P. Marconcini +5
We fabricate a graphene p-n-p heterojunction and exploit the coherence of weakly-confined Dirac quasiparticles to resolve the underlying scattering potential using low temperature…
Transport Spectroscopy of a Graphene Quantum Dot Fabricated by Atomic Force Microscope Nanolithography
R. K. Puddy, C. J. Chua, M. R. Buitelaar
We report low-temperature transport spectroscopy of a graphene quantum dot fabricated by atomic force microscope nanolithography. The excellent spatial resolution of the atomic for…
Non-Ohmic behavior of carrier transport in highly disordered graphene
Shun-Tsung Lo, Chiashain Chuang, R. K. Puddy +3
We report measurements of disordered graphene probed by both a high electric field and a high magnetic field. By apply a high source-drain voltage Vsd, we are able to study the cur…
Unraveling quantum Hall breakdown in bilayer graphene with scanning gate microscopy
M. R. Connolly, R. K. Puddy, D. Logoteta +7
We use low-temperature scanning gate microscopy (SGM) to investigate the breakdown of the quantum Hall regime in an exfoliated bilayer graphene flake. SGM images captured during br…
Reading and writing charge on graphene devices
M. R. Connolly, E. D. Herbschleb, R. K. Puddy +5
We use a combination of charge writing and scanning gate microscopy to map and modify the local charge neutrality point of graphene field-effect devices. We give a demonstration of…
Atomic force microscope nanolithography of graphene: cuts, pseudo-cuts and tip current measurements
R. K. Puddy, P. H. Scard, D. Tyndall +6
We investigate atomic force microscope nanolithography of single and bilayer graphene. In situ tip current measurements show that cutting of graphene is not current driven. Using a…