S. Kafanov
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View article: Fast optical data transfer into a Josephson junction array
Fast optical data transfer into a Josephson junction array Open
We employ externally shunted Nb-AlO$_x$-Nb Josephson junctions for demonstrating a circuit that is suitable for an optically driven Josephson Arbitrary Waveform Synthesizer (JAWS). This technology enables overdamped junctions with characte…
View article: Aluminum nanosized beams as probes of superfluid 4He
Aluminum nanosized beams as probes of superfluid 4He Open
Sub-micrometer size devices are strong candidates for future use as probes of quantum fluids. They can be reproducibly manufactured with resonant frequencies in the range of kilohertz to gigahertz and have low power consumption and dissipa…
View article: Simulating the effects of fabrication tolerance on the performance of Josephson travelling wave parametric amplifiers
Simulating the effects of fabrication tolerance on the performance of Josephson travelling wave parametric amplifiers Open
We present the simulated performance of a Josephson traveling wave parametric amplifier based on a one-dimensional array of radio-frequency single-junction superconducting quantum interference devices. Using the capabilities allowed by the…
View article: Photothermal Responsivity of van der Waals Material-Based Nanomechanical Resonators
Photothermal Responsivity of van der Waals Material-Based Nanomechanical Resonators Open
Nanomechanical resonators made from van der Waals materials (vdW NMRs) provide a new tool for sensing absorbed laser power. The photothermal response of vdW NMRs, quantified from the resonant frequency shifts induced by optical absorption,…
View article: Optoelectrical Nanomechanical Resonators Made from Multilayered Two-Dimensional Materials
Optoelectrical Nanomechanical Resonators Made from Multilayered Two-Dimensional Materials Open
Studies involving nanomechanical motion have evolved from the detection and understanding of its fundamental aspects to its promising practical utility as an integral component of hybrid systems. The nanomechanical resonators' indispensabl…
View article: Photothermal responsivity of van der Waals material-based nanomechanical resonators
Photothermal responsivity of van der Waals material-based nanomechanical resonators Open
Nanomechanical resonators made from van der Waals materials (vdW NMRs) provide a new tool for sensing absorbed laser power. The photothermal response of vdW NMRs, quantified from the resonant frequency shifts induced by optical absorption,…
View article: The Effect of Parameter Variations on the Performance of the Josephson Travelling Wave Parametric Amplifiers
The Effect of Parameter Variations on the Performance of the Josephson Travelling Wave Parametric Amplifiers Open
We have simulated the performance of the Josephson Travelling Wave Parametric Amplifier (JTWPA) based on the one-dimensional array of RF SQUIDs. Unlike the ideal model in which all SQUIDs are assumed to be identical, we allowed variation o…
View article: Fabry–Perot interferometric calibration of van der Waals material-based nanomechanical resonators
Fabry–Perot interferometric calibration of van der Waals material-based nanomechanical resonators Open
Multilayer interference approach is applied to confocal microscopy images of an electromotive-driven van der Waals material nanomechanical resonator to extract its thickness, gap height, and motional amplitude in the frequency and spatial …
View article: Optoelectrical Nanomechanical Resonators Made From Multilayered 2D Materials
Optoelectrical Nanomechanical Resonators Made From Multilayered 2D Materials Open
Studies involving nanomechanical motion have evolved from its detection and understanding of its fundamental aspects to its promising practical utility as an integral component of hybrid systems. Nanomechanical resonators’ indispensable ro…
View article: Optoelectrical nanomechanical resonators made from multilayered 2D materials
Optoelectrical nanomechanical resonators made from multilayered 2D materials Open
Studies involving nanomechanical motion have evolved from its detection and understanding of its fundamental aspects to its promising practical utility as an integral component of hybrid systems. Nanomechanical resonators' indispensable ro…
View article: Imaging Off‐Resonance Nanomechanical Motion as Modal Superposition
Imaging Off‐Resonance Nanomechanical Motion as Modal Superposition Open
Observation of resonance modes is the most straightforward way of studying mechanical oscillations because these modes have maximum response to stimuli. However, a deeper understanding of mechanical motion can be obtained by also looking a…
View article: Fabry-Perot Interferometric Calibration of 2D Nanomechanical Plate Resonators
Fabry-Perot Interferometric Calibration of 2D Nanomechanical Plate Resonators Open
Displacement calibration of nanomechanical plate resonators presents a challenging task. Large nanomechanical resonator thickness reduces the amplitude of the resonator motion due to its increased spring constant and mass, and its unique r…
View article: Observing off-resonance motion of nanomechanical resonators as modal superposition
Observing off-resonance motion of nanomechanical resonators as modal superposition Open
Observation of resonance modes is the most straightforward way of studying mechanical oscillations because these modes have maximum response to stimuli. However, a deeper understanding of mechanical motion could be obtained by also looking…
View article: Nanoscale Real-Time Detection of Quantum Vortices at Millikelvin Temperatures
Nanoscale Real-Time Detection of Quantum Vortices at Millikelvin Temperatures Open
Since we still lack a theory of classical turbulence, attention has focused on the conceptually simpler turbulence in quantum fluids. Can such systems of identical singly-quantized vortices provide a physically accessible "toy model" of th…
View article: Multimode probing of superfluid 4He by tuning forks
Multimode probing of superfluid 4He by tuning forks Open
Flexural mode vibrations of miniature piezoelectric tuning forks (TFs) are known to be highly sensitive to superfluid excitations and quantum turbulence in 3He and 4He quantum fluids, as well as to the elastic properties of solid 4He, comp…
View article: Driving nanomechanical resonators by phonon flux in superfluid \(\mathbf{^4He}\)
Driving nanomechanical resonators by phonon flux in superfluid \(\mathbf{^4He}\) Open
We report on nanomechanical resonators with very high-quality factors operated as mechanical probes in liquid helium \(^4\mathrm{He}\), with special attention to the superfluid regime down to millikelvin temperatures. Such resonators have …
View article: High Quality Factor Mechanical Resonance in a Silicon Nanowire
High Quality Factor Mechanical Resonance in a Silicon Nanowire Open
Resonance properties of nanomechanical resonators based on doubly clamped silicon nanowires, fabricated from silicon-on-insulator and coated with a thin layer of aluminum, were experimentally investigated. Resonance frequencies of the fund…
View article: Magnetic-field-induced parity effect in insulating Josephson junction chains
Magnetic-field-induced parity effect in insulating Josephson junction chains Open
We report the experimental manifestation of even-odd parity effects in the transport characteristics of insulating Josephson junction chains which occur as the superconducting gap is suppressed by applied magnetic fields at millikelvin tem…
View article: Insulating Josephson Junction Chains as Pinned Luttinger Liquids
Insulating Josephson Junction Chains as Pinned Luttinger Liquids Open
Quantum physics in one spatial dimension is remarkably rich, yet even with strong interactions and disorder, surprisingly tractable. This is due to the fact that the low-energy physics of nearly all one-dimensional systems can be cast in t…
View article: Depinning of the charged Bose glass: origin of the critical voltage in nanostructured Josephson-junction chains
Depinning of the charged Bose glass: origin of the critical voltage in nanostructured Josephson-junction chains Open
The low-temperature states of bosonic condensates exhibit fundamental quantum effects at the macroscopic scale. The combined effects of interaction and disorder in these can have drastic consequences, leading to the Mott insulator and Bose…
View article: Probing Liquid $$^4$$ 4 He with Quartz Tuning Forks Using a Novel Multifrequency Lock-in Technique
Probing Liquid $$^4$$ 4 He with Quartz Tuning Forks Using a Novel Multifrequency Lock-in Technique Open
We report on a novel technique to measure quartz tuning forks, and possibly other vibrating objects, in a quantum fluid using a multifrequency lock-in amplifier. The multifrequency technique allows to measure the resonance curve of a vibra…
View article: Dataset for Probing liquid 4He with quartz tuning forks using a novel multifrequency lock-in technique
Dataset for Probing liquid 4He with quartz tuning forks using a novel multifrequency lock-in technique Open
The data set corresponds to the figures (excluding schematics and images) in the associated publication. Data for each of the figures are clearly labelled, and fulfil EPSRC requirements. Full details of how the data was generated are given…
View article: Parity effect and single-electron injection for Josephson junction chains deep in the insulating state
Parity effect and single-electron injection for Josephson junction chains deep in the insulating state Open
We have made a systematic investigation of charge transport in 1D chains of\nJosephson junctions where the characteristic Josephson energy is much less than\nthe single-island Cooper-pair charging energy, $E_\\mathrm{J}\\ll E_{CP}$. Such\n…