Jonathan Griffiths
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View article: Novel passive resonant structures for precision assembly of synchrotron X-ray optics
Novel passive resonant structures for precision assembly of synchrotron X-ray optics Open
Many optics at synchrotron and free electron laser facilities need to be cooled to dissipate the heat imparted by the intense photon beams. For indirectly cooled optics, distortion of the surface can occur when excessive or asymmetrical cl…
View article: Formation of a lateral p-n junction light-emitting diode on an n-type high-mobility GaAs/Al$_{0.33}$Ga$_{0.67}$As heterostructure
Formation of a lateral p-n junction light-emitting diode on an n-type high-mobility GaAs/Al$_{0.33}$Ga$_{0.67}$As heterostructure Open
We have fabricated a device which includes two lateral p-n junctions on an n-type GaAs/Al$_{0.33}$Ga$_{0.67}$As heterostructure. A section of the n-type material has been converted to p-type by removing dopants and applying a voltage to a …
View article: Photon emission by hot electron injection across a lateral \textit{pn} junction
Photon emission by hot electron injection across a lateral \textit{pn} junction Open
We demonstrate a method to generate photons by injecting hot electrons into a {\it pn} junction within a \ce{GaAs/AlGaAs} heterostructure. Hot electrons are generated by biasing across a mesoscopic potential in {\it n}-type region and trav…
View article: Statistical evaluation of 571 GaAs quantum point contact transistors showing the 0.7 anomaly in quantized conductance using cryogenic on-chip multiplexing
Statistical evaluation of 571 GaAs quantum point contact transistors showing the 0.7 anomaly in quantized conductance using cryogenic on-chip multiplexing Open
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 cryostat or dilution refrigerator. It is, therefore, beneficial to…
View article: Statistical evaluation of 571 GaAs quantum point contact transistors showing the 0.7 anomaly in quantized conductance using millikelvin cryogenic on-chip multiplexing
Statistical evaluation of 571 GaAs quantum point contact transistors showing the 0.7 anomaly in quantized conductance using millikelvin cryogenic on-chip multiplexing Open
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 cryostat or dilution refrigerator. It is, therefore, beneficial to…
View article: Resistance hysteresis in the integer and fractional quantum Hall regime
Resistance hysteresis in the integer and fractional quantum Hall regime Open
We present experimental results where hysteresis is observed depending on the magnetic field sweep direction in the integer quantum Hall regime of a high-mobility two-dimensional electron system formed in a GaAs/AlGaAs heterostructure. We …
View article: Formation of a lateral p–n junction light-emitting diode on an n-type high-mobility GaAs/Al<sub>0.33</sub>Ga<sub>0.67</sub>As heterostructure
Formation of a lateral p–n junction light-emitting diode on an n-type high-mobility GaAs/Al<sub>0.33</sub>Ga<sub>0.67</sub>As heterostructure Open
We have fabricated a device which includes two lateral p–n junctions on an n-type GaAs/Al 0.33 Ga 0.67 As heterostructure. A section of the n-type material has been converted to p-type by removing dopants and applying a voltage to a gate p…
View article: Decoupling of the many-body effects from the electron mass in GaAs by means of reduced dimensionality
Decoupling of the many-body effects from the electron mass in GaAs by means of reduced dimensionality Open
Determining the (bare) electron mass m0 in crystals is often hindered by many-body effects since Fermi-liquid physics renormalizes the band mass, making the observed effective mass m* depend on density. Here, we use a one-dimensional (1D) …
View article: Electrically Controllable Kondo Correlation in Spin-Orbit-Coupled Quantum Point Contacts
Electrically Controllable Kondo Correlation in Spin-Orbit-Coupled Quantum Point Contacts Open
Integrating the Kondo correlation and spin-orbit interactions, each of which have individually offered unprecedented means to manipulate electron spins, in a controllable way can open up new possibilities for spintronics. We demonstrate el…
View article: High-yield parallel fabrication of quantum-dot monolayer single-electron devices displaying Coulomb staircase, contacted by graphene.
High-yield parallel fabrication of quantum-dot monolayer single-electron devices displaying Coulomb staircase, contacted by graphene. Open
It is challenging for conventional top-down lithography to fabricate reproducible devices very close to atomic dimensions, whereas identical molecules and very similar nanoparticles can be made bottom-up in large quantities, and can be sel…
View article: 1GHz clocked distribution of electrically generated entangled photon pairs
1GHz clocked distribution of electrically generated entangled photon pairs Open
Quantum networks are essential for realising distributed quantum computation and quantum communication. Entangled photons are a key resource, with applications such as quantum key distribution, quantum relays, and quantum repeaters. All co…
View article: High-Throughput Electrical Characterization of Nanomaterials from Room to Cryogenic Temperatures
High-Throughput Electrical Characterization of Nanomaterials from Room to Cryogenic Temperatures Open
We present multiplexer methodology and hardware for nanoelectronic device characterization. This high-throughput and scalable approach to testing large arrays of nanodevices operates from room temperature to milli-Kelvin temperatures and i…
View article: Research data supporting ‘High-Throughput Electrical Characterisation of Nanomaterials From Room to Cryogenic Temperatures’
Research data supporting ‘High-Throughput Electrical Characterisation of Nanomaterials From Room to Cryogenic Temperatures’ Open
Measurements are performed using electrical methods described in the paper. Data to generate all plots in the associated publication are contained within the zipped file as separate ‘.txt’ files. The README.txt file contains information ab…
View article: Hall resistance anomalies in the integer and fractional quantum Hall regime
Hall resistance anomalies in the integer and fractional quantum Hall regime Open
Experimental evidence of resistance anomalies in the high-mobility two-dimensional electron gas (2DEG) formed in the GaAs/AlGaAs heterostructure, in the integer and fractional quantized Hall regime, is shown. The data complement to a good …
View article: Erratum: “Sensitive radiofrequency readout of quantum dots using an ultra-low-noise SQUID amplifier” [J. Appl. Phys. 127, 244503 (2020)]
Erratum: “Sensitive radiofrequency readout of quantum dots using an ultra-low-noise SQUID amplifier” [J. Appl. Phys. 127, 244503 (2020)] Open
First Page
View article: Single-photon emission from single-electron transport in a SAW-driven lateral light-emitting diode.
Single-photon emission from single-electron transport in a SAW-driven lateral light-emitting diode. Open
The long-distance quantum transfer between electron-spin qubits in semiconductors is important for realising large-scale quantum computing circuits. Electron-spin to photon-polarisation conversion is a promising technology for achieving fr…
View article: Supporting data for "Single-photon emission from single-electron transport in a SAW-driven lateral light-emitting diode"
Supporting data for "Single-photon emission from single-electron transport in a SAW-driven lateral light-emitting diode" Open
Methods are described in the paper.\n\nFolders 'Figure 1' to 'Figure 4' contain the data used for plotting the figures 1-4 in the paper "Single-photon emission from single-electron transport in a SAW-driven lateral light-emitting diode".\n…
View article: Supplementary document for 1GHz clocked distribution of electrically generated entangled photon pairs - 4914253.pdf
Supplementary document for 1GHz clocked distribution of electrically generated entangled photon pairs - 4914253.pdf Open
Supplement 1
View article: Room-Temperature Measurement of Electrostatically Coupled, Dopant-Atom Double Quantum Dots in Point-Contact Transistors
Room-Temperature Measurement of Electrostatically Coupled, Dopant-Atom Double Quantum Dots in Point-Contact Transistors Open
The reduction of nanoelectronic devices to sub-10 nm sizes raises the prospect of electronics at the atomic scale, while also facilitating studies on nanoscale device physics. Single-atom transistors, where the current-switching element is…
View article: Quantized charge transport driven by a surface acoustic wave in induced unipolar and bipolar junctions
Quantized charge transport driven by a surface acoustic wave in induced unipolar and bipolar junctions Open
Surface acoustic waves (SAWs) have been used to transport single electrons across long distances of several hundreds of microns. They can potentially be instrumental in the implementation of scalable quantum processors and quantum repeater…