290 citations · 883 across the 24 of their papers we have counts for
24 papers
Sub-wavelength mid-infrared imaging of locally driven photocurrents using diamond campanile probes
Rajasekhar Medapalli, Nathan D. Cottam, Khushboo Agarwal +12
Precise and high efficiency concentration of mid-infrared (mid-IR) light into sub wavelength volumes is essential for probing low-energy excitations and achieving strong field enha…
Fast optical data transfer into a Josephson junction array
K. Kohopää, J. Nissilä, E. Mykkänen +19
We employ externally shunted Nb-AlO-Nb Josephson junctions for demonstrating a circuit that is suitable for an optically driven Josephson Arbitrary Waveform Synthesizer (JAWS).…
Photothermal responsivity of van der Waals material-based nanomechanical resonators
Myrron Albert C. Aguila, Joshoua C. Esmenda, Jyh-Yang Wang +8
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 t…
The Effect of Parameter Variations on the Performance of the Josephson Travelling Wave Parametric Amplifiers
Searbhán Ó Peatáin, Tom Dixon, Phil J. Meeson +3
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…
Optoelectrical nanomechanical resonators made from multilayered 2D materials
Joshoua Condicion Esmenda, Myrron Albert Callera Aguila, Jyh-Yang Wang +8
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…
Fabry-Perot Interferometric Calibration of 2D Nanomechanical Plate Resonators
Myrron Albert Callera Aguila, Joshoua Condicion Esmenda, Jyh-Yang Wang +7
Displacement calibration of nanomechanical plate resonators presents a challenging task. Large nanomechanical resonator thickness reduces the amplitude of the resonator motion due…
Observing off-resonance motion of nanomechanical resonators as modal superposition
Joshoua Condicion Esmenda, Myrron Albert Callera Aguila, Jyh-Yang Wang +8
Observation of resonance modes is the most straightforward way of studying mechanical oscillations because these modes have maximum response to stimuli. However, a deeper understan…
Multimode probing of superfluid by tuning forks
A. Guthrie, R. P. Haley, A. Jennings +9
Flexural mode vibrations of miniature piezoelectric tuning forks (TF) are known to be highly sensitive to superfluid excitations and quantum turbulence in and $\mat…
Detecting the "phonon wind" in superfluid by a nanomechanical resonator
A. M. Guenault, A. Guthrie, R. P. Haley +8
Nanoscale mechanical resonators are widely utilized to provide high sensitivity force detectors. Here we demonstrate that such high quality factor resonators immersed in superfluid…
Driving nanomechanical resonators by phonon flux in superfluid \(\mathbf{^4He}\)
A. M. Guénault, A. Guthrie, R. P. Haley +10
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 reg…
Operating Nanobeams in a Quantum Fluid
D. I. Bradley, R. George, A. M. Guenault +12
Microelectromechanical (MEMS) and nanoelectromechanical systems (NEMS) are ideal candidates for exploring quantum fluids since they can be manufactured reproducibly, cover the freq…
High quality factor mechanical resonance in a silicon nanowire
D. E. Presnov, S. Kafanov, A. A. Dorofeev +4
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 exp…
Magnetic-field-induced parity effect in insulating Josephson junction chains
Timothy Duty, Karin Cedergren, Sergey Kafanov +2
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…
Insulating Josephson-junction chains as pinned Luttinger liquids
Karin Cedergren, Roger Ackroyd, Sergey Kafanov +3
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 phy…
A planar Al-Si Schottky Barrier MOSFET operated at cryogenic temperatures
Wendy E. Purches, Alessandro Rossi, Ruichen Zhao +5
Schottky Barrier (SB)-MOSFET technology offers intriguing possibilities for cryogenic nano-scale devices, such as Si quantum devices and superconducting devices. We present experim…
Single Flux Transistor: the controllable interplay of Coherent Quantum Phase Slip and Flux quantization
S. Kafanov, N. M. Chtchelkatchev
The Single Cooper Pair Josephson Transistor is a device that exhibits at the same time charge quantization and phase coherence. Coherent quantum phase slip phenomenon is "dual" the…
Coherent quantum phase slip
O. V. Astafiev, L. B. Ioffe, S. Kafanov +5
A hundred years after discovery of superconductivity, one fundamental prediction of the theory, the coherent quantum phase slip (CQPS), has not been observed. CQPS is a phenomenon…
Photon assisted tunneling as an origin of the Dynes density of states
J. P. Pekola, V. F. Maisi, S. Kafanov +6
We show that the effect of a high-temperature environment in current transport through a normal metal-insulator-superconductor tunnel junction can be described by an effective dens…
Parallel pumping of electrons
V. F. Maisi, Yu. A. Pashkin, S. Kafanov +2
We present simultaneous operation of ten single-electron turnstiles leading to one order of magnitude increase in current level up to 100 pA. Our analysis of device uniformity and…
Periodicity in Al/Ti superconducting single electron transistors
Sarah J. MacLeod, Sergey Kafanov, Jukka P. Pekola
We present experiments on single Cooper-pair transistors made of two different superconducting materials. We chose Ti and Al to create an energy gap profile such that the island ha…
Electronic Radio-Frequency Refrigerator
S. Kafanov, A. Kemppinen, Yu. A. Pashkin +3
We demonstrate experimentally that a hybrid single-electron transistor with superconducting leads and a normal-metal island can be refrigerated by an alternating voltage applied to…
Experimental investigation of hybrid single-electron turnstiles with high charging energy
A. Kemppinen, S. Kafanov, Yu. A. Pashkin +3
We present an experimental study of hybrid turnstiles with high charging energies in comparison to the superconducting gap. The device is modeled with the sequential tunneling appr…
Is charge noise in single electron transistors and charge qubits caused by metallic grains?
S. Kafanov, H. Brenning, T. Duty +1
We report on measurements of low frequency noise in a single electron transistor from a few Hz up to 10 MHz. Measurements were done for different bias and gate voltages, which allo…
An ultra sensitive radio frequency single electron transistor working up to 4.2 K
Henrik Brenning, Sergey Kafanov, Tim Duty +2
We present the fabrication and measurement of a radio frequency single electron transistor (rf-SET), that displays a very high charge sensitivity of 1.9 microlectrons/sqrt(Hz) at 4…