Outputs (35)

Quantum nature of charge transport in inkjet-printed graphene revealed in high magnetic fields up to 60T (2024)
Journal Article
Cottam, N. D., Wang, F., Austin, J. S., Tuck, C. J., Hague, R., Fromhold, M., …Turyanska, L. (2024). Quantum nature of charge transport in inkjet-printed graphene revealed in high magnetic fields up to 60T. Small, Article 2311416. https://doi.org/10.1002/smll.202311416

Inkjet‐printing of graphene, iGr, provides an alternative route for the fabrication of highly conductive and flexible graphene films for use in devices. However, the contribution of quantum phenomena associated with 2D single layer graphene, SLG, to... Read More about Quantum nature of charge transport in inkjet-printed graphene revealed in high magnetic fields up to 60T.

Designing Optimal Loop, Saddle, and Ellipse-Based Magnetic Coils by Spherical Harmonic Mapping (2023)
Journal Article
Hobson, P. J., Hardwicke, N. L., Davis, A., Smith, T. X., Morley, C., Packer, M., …Fromhold, M. (2023). Designing Optimal Loop, Saddle, and Ellipse-Based Magnetic Coils by Spherical Harmonic Mapping. IEEE Transactions on Instrumentation and Measurement, 72, Article 1005815. https://doi.org/10.1109/TIM.2023.3284138

Adaptable, low-cost, coils designed by carefully selecting the arrangements and geometries of simple primitive units are used to generate magnetic fields for diverse applications. These extend from magnetic resonance and fundamental physics experimen... Read More about Designing Optimal Loop, Saddle, and Ellipse-Based Magnetic Coils by Spherical Harmonic Mapping.

Wireless electrical–molecular quantum signalling for cancer cell apoptosis (2023)
Journal Article
Jain, A., Gosling, J., Liu, S., Wang, H., Stone, E. M., Chakraborty, S., …Rawson, F. J. (2024). Wireless electrical–molecular quantum signalling for cancer cell apoptosis. Nature Nanotechnology, 19, 106-114. https://doi.org/10.1038/s41565-023-01496-y

Quantum biological tunnelling for electron transfer is involved in controlling essential functions for life such as cellular respiration and homoeostasis. Understanding and controlling the quantum effects in biology has the potential to modulate biol... Read More about Wireless electrical–molecular quantum signalling for cancer cell apoptosis.

Benchtop magnetic shielding for benchmarking atomic magnetometers (2023)
Journal Article
Hobson, P. J., Holmes, N., Patel, P., Styles, B., Chalmers, J., Morley, C., …Fromhold, M. (2023). Benchtop magnetic shielding for benchmarking atomic magnetometers. IEEE Transactions on Instrumentation and Measurement, 72, Article 6007309. https://doi.org/10.1109/tim.2023.3293540

Here, a benchtop hybrid magnetic shield containing four mumetal cylinders and nine internal flexible printed circuit boards is designed, constructed, tested, and operated. The shield is designed specifically as a test-bed for building and operating u... Read More about Benchtop magnetic shielding for benchmarking atomic magnetometers.

Naturalistic Hyperscanning with Wearable Magnetoencephalography (2023)
Journal Article
Holmes, N., Rea, M., Hill, R. M., Boto, E., Leggett, J., Edwards, L. J., …Bowtell, R. (2023). Naturalistic Hyperscanning with Wearable Magnetoencephalography. Sensors, 23(12), Article 5454. https://doi.org/10.3390/s23125454

The evolution of human cognitive function is reliant on complex social interactions which form the behavioural foundation of who we are. These social capacities are subject to dramatic change in disease and injury; yet their supporting neural substra... Read More about Naturalistic Hyperscanning with Wearable Magnetoencephalography.

Enabling ambulatory movement in wearable magnetoencephalography with matrix coil active magnetic shielding (2023)
Journal Article
Holmes, N., Rea, M., Hill, R. M., Leggett, J., Edwards, L. J., Hobson, P. J., …Bowtell, R. (2023). Enabling ambulatory movement in wearable magnetoencephalography with matrix coil active magnetic shielding. NeuroImage, 274, Article 120157. https://doi.org/10.1016/j.neuroimage.2023.120157

The ability to collect high-quality neuroimaging data during ambulatory participant movement would enable a wealth of neuroscientific paradigms. Wearable magnetoencephalography (MEG) based on optically pumped magnetometers (OPMs) has the potential to... Read More about Enabling ambulatory movement in wearable magnetoencephalography with matrix coil active magnetic shielding.

Casimir-Polder interactions of S-state Rydberg atoms with graphene (2023)
Journal Article
Wongcharoenbhorn, K., Koller, C., Fromhold, T. M., & Li, W. (2023). Casimir-Polder interactions of S-state Rydberg atoms with graphene. Physical Review A, 107(4), Article 043308. https://doi.org/10.1103/PhysRevA.107.043308

We investigate the thermal Casimir-Polder (CP) potential of 87Rb atoms in Rydberg nS-states near single- and double-layer graphene, and briefly look into the lifetimes near graphene-hexagonal boron nitride (hBN) multilayered structures. The dependenc... Read More about Casimir-Polder interactions of S-state Rydberg atoms with graphene.

Graphene FETs with high and low mobilities have universal temperature-dependent properties (2023)
Journal Article
Gosling, J., Morozov, S. V., Vdovin, E. E., Greenaway, M. T., Khanin, Y. N., Kudrynskyi, Z., …Makarovsky, O. (2023). Graphene FETs with high and low mobilities have universal temperature-dependent properties. Nanotechnology, 34(12), Article 125702. https://doi.org/10.1088/1361-6528/aca981

We use phenomenological modelling and detailed experimental studies of charge carrier transport to investigate the dependence of the electrical resistivity,ρ, on gate voltage,Vg, for a series of monolayer graphene field effect transistors with mobili... Read More about Graphene FETs with high and low mobilities have universal temperature-dependent properties.

Magnetic field design in a cylindrical high-permeability shield: The combination of simple building blocks and a genetic algorithm (2022)
Journal Article
Packer, M., Hobson, P. J., Davis, A., Holmes, N., Leggett, J., Glover, P., …Fromhold, T. M. (2022). Magnetic field design in a cylindrical high-permeability shield: The combination of simple building blocks and a genetic algorithm. Journal of Applied Physics, 131(9), Article 093902. https://doi.org/10.1063/5.0071986

Magnetically sensitive experiments and newly developed quantum technologies with integrated high-permeability magnetic shields require increasing control of their magnetic field environment and reductions in size, weight, power, and cost. However, ma... Read More about Magnetic field design in a cylindrical high-permeability shield: The combination of simple building blocks and a genetic algorithm.

Optimised hybrid shielding and magnetic field control for emerging quantum technologies (2021)
Conference Proceeding
Hobson, P. J., Packer, M., Holmes, N., Davis, A., Patel, P., Holmes, D., …Fromhold, T. M. (2021). Optimised hybrid shielding and magnetic field control for emerging quantum technologies. In M. J. Padgett, K. Bongs, A. Fedrizzi, & A. Politi (Eds.), Proceedings Volume 11881, Quantum Technology: Driving Commercialisation of an Enabling Science II. https://doi.org/10.1117/12.2598780

The accurate control of magnetic fields is a cornerstone of multiple emerging quantum technologies. These technologies often require passive high permeability magnetic shielding and internal active field-generating coils to create their own bespoke m... Read More about Optimised hybrid shielding and magnetic field control for emerging quantum technologies.

Performance-Optimized Components for Quantum Technologies via Additive Manufacturing (2021)
Journal Article
Madkhaly, S. H., Coles, L. A., Morley, C., Colquhoun, C. D., Fromhold, T. M., Cooper, N., & Hackermüller, L. (2021). Performance-Optimized Components for Quantum Technologies via Additive Manufacturing. PRX Quantum, 2(3), Article 030326. https://doi.org/10.1103/prxquantum.2.030326

Novel quantum technologies and devices place unprecedented demands on the performance of experimental components, while their widespread deployment beyond the laboratory necessitates increased robustness and fast affordable production. We show how th... Read More about Performance-Optimized Components for Quantum Technologies via Additive Manufacturing.

Universal mobility characteristics of graphene originating from charge scattering by ionised impurities (2021)
Journal Article
Gosling, J. H., Makarovsky, O., Wang, F., Cottam, N. D., Greenaway, M. T., Patanè, A., …Fromhold, T. M. (2021). Universal mobility characteristics of graphene originating from charge scattering by ionised impurities. Communications Physics, 4(1), Article 30. https://doi.org/10.1038/s42005-021-00518-2

Pristine graphene and graphene-based heterostructures can exhibit exceptionally high electron mobility if their surface contains few electron-scattering impurities. Mobility directly influences electrical conductivity and its dependence on the carrie... Read More about Universal mobility characteristics of graphene originating from charge scattering by ionised impurities.

Additively manufactured ultra-high vacuum chamber for portable quantum technologies (2021)
Journal Article
Cooper, N., Coles, L., Everton, S., Maskery, I., Campion, R., Madkhaly, S., …Hackermüller, L. (2021). Additively manufactured ultra-high vacuum chamber for portable quantum technologies. Additive Manufacturing, 40, Article 101898. https://doi.org/10.1016/j.addma.2021.101898

© 2021 Additive manufacturing is having a dramatic impact on research and industry across multiple sectors, but the production of additively manufactured systems for ultra-high vacuum applications has so far proved elusive and widely been considered... Read More about Additively manufactured ultra-high vacuum chamber for portable quantum technologies.

Emergence and control of complex behaviors in driven systems of interacting qubits with dissipation (2021)
Journal Article
Andreev, A. V., Balanov, A. G., Fromhold, T. M., Greenaway, M. T., Hramov, A. E., Li, W., …Zagoskin, A. M. (2021). Emergence and control of complex behaviors in driven systems of interacting qubits with dissipation. npj Quantum Information, 7(1), Article 1. https://doi.org/10.1038/s41534-020-00339-1

Progress in the creation of large scale, artificial quantum coherent structures demands the investigation of their nonequilibrium dynamics when strong interactions, even between remote parts, are non-perturbative. Analysis of multiparticle quantum co... Read More about Emergence and control of complex behaviors in driven systems of interacting qubits with dissipation.

Optimal Inverse Design of Magnetic Field Profiles in a Magnetically Shielded Cylinder (2020)
Journal Article
Packer, M., Hobson, P., Holmes, N., Leggett, J., Glover, P., Brookes, M., …Fromhold, T. (2020). Optimal Inverse Design of Magnetic Field Profiles in a Magnetically Shielded Cylinder. Physical Review Applied, 14(5), Article 054004. https://doi.org/10.1103/PhysRevApplied.14.054004

Magnetic shields that use both active and passive components to enable the generation of a tailored low-field environment are required for many applications in science, engineering, and medical imaging. Until now, accurate field nulling, or field gen... Read More about Optimal Inverse Design of Magnetic Field Profiles in a Magnetically Shielded Cylinder.

Inter-Flake Quantum Transport of Electrons and Holes in Inkjet-Printed Graphene Devices (2020)
Journal Article
Wang, F., Gosling, J. H., Rance, G. A., Trindade, G. F., Makarovsky, O., Cottam, N. D., …Turyanska, L. (2021). Inter-Flake Quantum Transport of Electrons and Holes in Inkjet-Printed Graphene Devices. Advanced Functional Materials, 31(5), Article 2007478. https://doi.org/10.1002/adfm.202007478

© 2020 The Authors. Advanced Functional Materials published by Wiley-VCH GmbH 2D materials have unique structural and electronic properties with potential for transformative device applications. However, such devices are usually bespoke structures ma... Read More about Inter-Flake Quantum Transport of Electrons and Holes in Inkjet-Printed Graphene Devices.

Wearable neuroimaging: Combining and contrasting magnetoencephalography and electroencephalography (2019)
Journal Article
Boto, E., Seedat, Z. A., Holmes, N., Leggett, J., Hill, R. M., Roberts, G., …Brookes, M. J. (2019). Wearable neuroimaging: Combining and contrasting magnetoencephalography and electroencephalography. NeuroImage, 201, Article 116099. https://doi.org/10.1016/j.neuroimage.2019.116099

Towards OPM-MEG in a virtual reality environment (2019)
Journal Article
Roberts, G., Holmes, N., Alexander, N., Boto, E., Leggett, J., Hill, R. M., …Brookes, M. J. (2019). Towards OPM-MEG in a virtual reality environment. NeuroImage, 199, 408-417. https://doi.org/10.1016/j.neuroimage.2019.06.010

Virtual reality (VR) provides an immersive environment in which a participant can experience a feeling of presence in a virtual world. Such environments generate strong emotional and physical responses and have been used for wide-ranging applications... Read More about Towards OPM-MEG in a virtual reality environment.

Tunnel spectroscopy of localised electronic states in hexagonal boron nitride (2018)
Journal Article
Patanè, A., Mishchenko, A., Greenaway, M., Vdovin, E., Ghazaryan, D., Misra, A., …Eaves, L. (2018). Tunnel spectroscopy of localised electronic states in hexagonal boron nitride. Communications Physics, 1(1), Article 94. https://doi.org/10.1038/s42005-018-0097-1

Hexagonal boron nitride is a large band gap layered crystal, frequently incorporated in van der Waals heterostructures as an insulating or tunnel barrier. Localised states with energies within its band gap can emit visible light, relevant to applicat... Read More about Tunnel spectroscopy of localised electronic states in hexagonal boron nitride.

3D-printed components for quantum devices (2018)
Journal Article
Saint, R., Evans, W., Zhou, Y., Barrett, T. J., Fromhold, T., Saleh, E., …Krüger, P. (2018). 3D-printed components for quantum devices. Scientific Reports, 8, https://doi.org/10.1038/s41598-018-26455-9

Recent advances in the preparation, control and measurement of atomic gases have led to new insights into the quantum world and unprecedented metrological sensitivities, e.g. in measuring gravitational forces and magnetic fields. The full potential o... Read More about 3D-printed components for quantum devices.

Atom chips with free-standing two-dimensional electron gases: advantages and challenges (2018)
Journal Article
Sinuco-León, G. A., Kruger, P., & Fromhold, M. (2018). Atom chips with free-standing two-dimensional electron gases: advantages and challenges. Journal of Modern Optics, 65(5-6), https://doi.org/10.1080/09500340.2017.1423410

In this work, we consider the advantages and challenges of using free-standing two-dimensional electron gases (2DEG) as active components in atom chips for manipulating ultracold ensembles of alkali atoms. We calculate trapping parameters achievable... Read More about Atom chips with free-standing two-dimensional electron gases: advantages and challenges.

Superfluid flow above the critical velocity (2017)
Journal Article
Paris-Mandoki, A., Shearring, J., Mancarella, F., Fromhold, T., Trombettoni, A., & Kruger, P. (2017). Superfluid flow above the critical velocity. Scientific Reports, 7(1), Article 9070. https://doi.org/10.1038/s41598-017-08941-8

Superfluidity and superconductivity have been widely studied since the last century in many different contexts ranging from nuclear matter to atomic quantum gases. The rigidity of these systems with respect to external perturbations results in fricti... Read More about Superfluid flow above the critical velocity.

Enhancing optoelectronic properties of SiC-grown graphene by a surface layer of colloidal quantum dots (2017)
Journal Article
Makarovsky, O., Turyanska, L., Mori, N., Greenaway, M., Eaves, L., Patanè, A., …Yakimova, R. (in press). Enhancing optoelectronic properties of SiC-grown graphene by a surface layer of colloidal quantum dots. 2D Materials, 4(3), https://doi.org/10.1088/2053-1583/aa76bb

We report a simultaneous increase of carrier concentration, mobility and photoresponsivity when SiC-grown graphene is decorated with a surface layer of colloidal PbS quantum dots, which act as electron donors. The charge on the ionised dots is spatia... Read More about Enhancing optoelectronic properties of SiC-grown graphene by a surface layer of colloidal quantum dots.

Microwave Generation in Synchronized Semiconductor Superlattices (2017)
Journal Article
Gaifullin, M., Alexeeva, N., Hramov, A., Makarov, V., Maksimenko, V., Koronovskii, A., …Balanov, A. (2017). Microwave Generation in Synchronized Semiconductor Superlattices. Physical Review Applied, 7(4), Article 044024. https://doi.org/10.1103/PhysRevApplied.7.044024

We study high-frequency generation in a system of electromagnetically coupled semiconductor superlattices fabricated on the same doped substrate. Applying a bias voltage to a single superlattice generates high-frequency current oscillations. We demon... Read More about Microwave Generation in Synchronized Semiconductor Superlattices.

A new generation of magnetoencephalography: Room temperature measurements using optically-pumped magnetometers (2017)
Journal Article
Boto, E., Meyer, S. S., Shah, V., Alem, O., Knappe, S., Kruger, P., …Brookes, M. J. (2017). A new generation of magnetoencephalography: Room temperature measurements using optically-pumped magnetometers. NeuroImage, 149, 404-414. https://doi.org/10.1016/j.neuroimage.2017.01.034

© 2017 The Authors Advances in the field of quantum sensing mean that magnetic field sensors, operating at room temperature, are now able to achieve sensitivity similar to that of cryogenically cooled devices (SQUIDs). This means that room temperatur... Read More about A new generation of magnetoencephalography: Room temperature measurements using optically-pumped magnetometers.

On the potential of a new generation of magnetometers for MEG: a beamformer simulation study (2016)
Journal Article
Boto, E., Bowtell, R. W., Kruger, P., Fromhold, T. M., Morris, P. G., Meyer, S. S., …Brookes, M. J. (2016). On the potential of a new generation of magnetometers for MEG: a beamformer simulation study. PLoS ONE, 11(8), Article e0157655. https://doi.org/10.1371/journal.pone.0157655

Magnetoencephalography (MEG) is a sophisticated tool which yields rich information on the spatial, spectral and temporal signatures of human brain function. Despite unique potential, MEG is limited by a low signal-to-noise ratio (SNR) which is caused... Read More about On the potential of a new generation of magnetometers for MEG: a beamformer simulation study.

The UK National Quantum Technologies Hub in sensors and metrology (Keynote Paper) (2016)
Journal Article
Bongs, K., Boyer, V., Cruise, M., Freise, A., Holynski, M., Hughes, J., …John, P. (2016). The UK National Quantum Technologies Hub in sensors and metrology (Keynote Paper). Proceedings of SPIE, 9900, Article 990009. https://doi.org/10.1117/12.2232143

The UK National Quantum Technology Hub in Sensors and Metrology is one of four flagship initiatives in the UK National of Quantum Technology Program. As part of a 20-year vision it translates laboratory demonstrations to deployable practical devices,... Read More about The UK National Quantum Technologies Hub in sensors and metrology (Keynote Paper).

Phonon-Assisted Resonant Tunneling of Electrons in Graphene–Boron Nitride Transistors (2016)
Journal Article
Vdovin, E. E., Mishchenko, A., Greenaway, M., Zhu, M., Ghazaryan, D., Misra, A., …Eaves, L. (2016). Phonon-Assisted Resonant Tunneling of Electrons in Graphene–Boron Nitride Transistors. Physical Review Letters, 116(18), Article 186603. https://doi.org/10.1103/PhysRevLett.116.186603

We observe a series of sharp resonant features in the differential conductance of graphene-hexagonal boron nitride-graphene tunnel transistors over a wide range of bias voltages between 10 and 200 mV. We attribute them to electron tunneling assisted... Read More about Phonon-Assisted Resonant Tunneling of Electrons in Graphene–Boron Nitride Transistors.

Resonant tunnelling between the chiral Landau states of twisted graphene lattices (2015)
Journal Article
Greenaway, M., Vdovin, E. E., Mishchenko, A., Makarovsky, O., Patanè, A., Wallbank, J., …Eaves, L. (2015). Resonant tunnelling between the chiral Landau states of twisted graphene lattices. Nature Physics, 11(12), 1057-1062. https://doi.org/10.1038/nphys3507

A class of multilayered functional materials has recently emerged in which the component atomic layers are held together by weak van der Waals forces that preserve the structural integrity and physical properties of each layer. An exemplar of such a... Read More about Resonant tunnelling between the chiral Landau states of twisted graphene lattices.

Graphene-hexagonal boron nitride resonant tunneling diodes as high-frequency oscillators (2015)
Journal Article
Gaskell, J., Eaves, L., Novoselov, K., Mishchenko, A., Geim, A., Fromhold, T., & Greenaway, M. (2015). Graphene-hexagonal boron nitride resonant tunneling diodes as high-frequency oscillators. Applied Physics Letters, 107(10), Article 103105. https://doi.org/10.1063/1.4930230

We assess the potential of two-terminal graphene-hexagonal boron nitride-graphene resonant tunneling diodes as high-frequency oscillators, using self-consistent quantum transport and electrostatic simulations to determine the time-dependent response... Read More about Graphene-hexagonal boron nitride resonant tunneling diodes as high-frequency oscillators.

Sub-terahertz amplification in a semiconductor superlattice with moving charge domains (2015)
Journal Article
Makarov, V., Hramov, A., Koronovskii, A., Alekseev, K., Maximenko, V., Greenaway, M., …Balanov, A. (2015). Sub-terahertz amplification in a semiconductor superlattice with moving charge domains. Applied Physics Letters, 106(4), Article 043503. https://doi.org/10.1063/1.4906531

We theoretically study the high-frequency response of charge domains traveling through a strongly coupled semiconductor superlattice with an applied harmonic electromagnetic signal. Our calculations show that the superlattice alone can amplify signal... Read More about Sub-terahertz amplification in a semiconductor superlattice with moving charge domains.

Twist-controlled resonant tunnelling in graphene/boron nitride/graphene heterostructures (2014)
Journal Article
Mishchenko, A., Tu, J., Cao, Y., Gorbachev, R., Wallbank, J., Greenaway, M., …Novoselov, K. (2014). Twist-controlled resonant tunnelling in graphene/boron nitride/graphene heterostructures. Nature Nanotechnology, 9, 808-813. https://doi.org/10.1038/NNANO.2014.187

Recent developments in the technology of van der Waals heterostructures made from two-dimensional atomic crystals ave already led to the observation of new physical phenomena, such as the metal-insulator transition and Coulomb drag, and to the realis... Read More about Twist-controlled resonant tunnelling in graphene/boron nitride/graphene heterostructures.

iSense: a technology platform for cold atom based quantum technologies (2014)
Conference Proceeding
Bongs, K., Malcolm, J., Ramelloo, C., Zhu, L., Boyer, V., Valenzuela, T., …Wicht, A. (2014). iSense: a technology platform for cold atom based quantum technologies. In Research in Optical Sciences. https://doi.org/10.1364/QIM.2014.QTu3B.1

A breakthrough in cold atom quantum technology is hindered by a bottleneck in the supporting technologies. We discuss a cold atom technology platform developed within the European iSense project, aiming at a gravimeter as demonstrator.

Subterahertz chaos generation by coupling a superlattice to a linear resonator (2014)
Journal Article
Hramov, A., Makarov, V., Koronovskii, A., Kurkin, S., Gaifullin, M., Alexeeva, N., …Balanov, A. (2014). Subterahertz chaos generation by coupling a superlattice to a linear resonator. Physical Review Letters, 112(116603), https://doi.org/10.1103/PhysRevLett.112.116603

We investigate the effects of a linear resonator on the high-frequency dynamics of electrons in devices exhibiting negative differential conductance. We show that the resonator strongly affects both the dc and ac transport characteristics of the devi... Read More about Subterahertz chaos generation by coupling a superlattice to a linear resonator.

III-V semiconductor waveguides for photonic functionality at 780 nm (2014)
Journal Article
Maclean, J. O., Greenaway, M. T., Campion, R. P., Pyragius, T., Fromhold, T. M., Kent, A. J., & Mellor, C. J. (2014). III-V semiconductor waveguides for photonic functionality at 780 nm. Proceedings of SPIE, 8988, Article 898805. https://doi.org/10.1117/12.2039898

Photonic integrated circuits based on III-V semiconductor polarization-maintaining waveguides were designed and fabricated for the first time for application in a compact cold-atom gravimeter1,2 at an operational wavelength of 780 nm. Compared with o... Read More about III-V semiconductor waveguides for photonic functionality at 780 nm.