A. G. Kozorezov
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View article: Voltage Fluctuations in ac Biased Superconducting Transition-Edge Sensors
Voltage Fluctuations in ac Biased Superconducting Transition-Edge Sensors Open
We present a detailed analysis of the fundamental noise sources in superconducting transition-edge sensors (TESs), ac voltage biased at MHz frequencies and treated as superconducting weak links. We have studied the noise in the resistive t…
View article: Self-Heating Hotspots in Superconducting Nanowires Cooled by Phonon Black-Body Radiation
Self-Heating Hotspots in Superconducting Nanowires Cooled by Phonon Black-Body Radiation Open
Controlling thermal transport is important for a range of devices and technologies, from phase change memories to next-generation electronics. This is especially true in nano-scale devices where thermal transport is altered by the influenc…
View article: Single-photon detection in the mid-infrared up to 10 <i>μ</i>m wavelength using tungsten silicide superconducting nanowire detectors
Single-photon detection in the mid-infrared up to 10 <i>μ</i>m wavelength using tungsten silicide superconducting nanowire detectors Open
We developed superconducting nanowire single-photon detectors based on tungsten silicide, which show saturated internal detection efficiency up to a wavelength of 10 μm. These detectors are promising for applications in the mid-infrared re…
View article: Self-Heating Hotspots in Superconducting Nanowires Cooled by Phonon Black-Body Radiation
Self-Heating Hotspots in Superconducting Nanowires Cooled by Phonon Black-Body Radiation Open
Controlling thermal transport is important for a range of devices and technologies, from phase change memories to next-generation electronics. This is especially true in nano-scale devices where thermal transport is altered by the influenc…
View article: Determining the depairing current in superconducting nanowire single-photon detectors
Determining the depairing current in superconducting nanowire single-photon detectors Open
We estimate the depairing current of superconducting nanowire single photon\ndetectors (SNSPDs) by studying the dependence of the nanowires kinetic\ninductance on their bias current. The kinetic inductance is determined by\nmeasuring the r…
View article: Intrinsic Timing Jitter and Latency in Superconducting Nanowire Single-photon Detectors
Intrinsic Timing Jitter and Latency in Superconducting Nanowire Single-photon Detectors Open
We analyze the origin of the intrinsic timing jitter in superconducting nanowire single photon detectors (SNSPDs) in terms of fluctuations in the latency of the detector response, which is determined by the microscopic physics of the photo…
View article: An ultrahigh-impedance superconducting thermal switch for interfacing superconductors to semiconductors and optoelectronics
An ultrahigh-impedance superconducting thermal switch for interfacing superconductors to semiconductors and optoelectronics Open
A number of current approaches to quantum and neuromorphic computing use superconductors as the basis of their platform or as a measurement component, and will need to operate at cryogenic temperatures. Semiconductor systems are typically …
View article: Nonbolometric bottleneck in electron-phonon relaxation in ultrathin WSi films
Nonbolometric bottleneck in electron-phonon relaxation in ultrathin WSi films Open
We developed the model of the internal phonon bottleneck to describe the\nenergy exchange between the acoustically soft ultrathin metal film and\nacoustically rigid substrate. Discriminating phonons in the film into two\ngroups, escaping a…
View article: Fano fluctuations in superconducting-nanowire single-photon detectors
Fano fluctuations in superconducting-nanowire single-photon detectors Open
Because of their universal nature, Fano fluctuations are expected to influence the response of superconducting nanowire single-photon detectors (SNSPDs). We predict that photon counting rate ($PCR$) as a function of bias current ($I_B$) in…
View article: Study of TES-Based Microcalorimeters of Different Size and Geometry Under AC Bias
Study of TES-Based Microcalorimeters of Different Size and Geometry Under AC Bias Open
Frequency-division multiplexing (FDM) is the current baseline read-out system for the large array of superconducting transition edge sensors (TES's) under development for the X-ray instrument XIFU (Athena). In this multiplexing scheme the …
View article: Electron-phonon relaxation time in ultrathin tungsten silicon film
Electron-phonon relaxation time in ultrathin tungsten silicon film Open
We developed the model of the internal phonon bottleneck to describe the energy exchange between the acoustically soft ultrathin metal film and acoustically rigid substrate. Discriminating phonons in the film into two groups, escaping and …
View article: Hotspot relaxation dynamics in a current-carrying superconductor
Hotspot relaxation dynamics in a current-carrying superconductor Open
We experimentally studied the dynamics of optically excited hotspots in current carrying WSi superconducting nanowires as a function of bias current, bath temperature and excitation wavelength. We discovered that: (1) the hotspot relaxatio…