engineer-pysisyst, cryogenic, quantum, bioimaging

Sergey Pereverzev extended CV

******@*****.***, cell: 1-925-***-****

Summary

Engineer-physicist (Ph.D.) with multidisciplinary and multicultural experience, expertise in cryogenic instrumentation and low-noise detector development. Extensive experience in low- temperature phenomena, quantum sensors, and noble-liquid detectors. Actively seeking new opportunities to contribute to challenging experimental physics and engineering projects. US citizen, DOE clearance.

Career Highlights

• First observation of the Josephson effect in superfluid He-3 — Instrumentation development: SQUID readout, suppression of motion-induced decoherence, development of quantitative two-fluid hydrodynamics model to describe observations,

• First mid-IR photon-energy-resolving free-electron micro-calorimeter — Materials characterization and instrumentation: electron-phonon interactions, heat capacity and thermal conductivity, SQUID back-action, SQUID readout.

• Cryogenic, high-voltage, and impurity control in noble liquid detectors; Identified excess (delayed energy release) backgrounds in dark matter and neutrino detectors. Skills / Hands-On Experience

• Engineering Skills:

o cryostats design and assembly for low and ultra-low temperature refrigeration (JT coolers, thermal pumps, He-4 / He-3 fridges, dilution refrigerators, nuclear demagnetization), cryogenic leads (high-voltage, high-current, high-frequency) o electromagnetic and mechanical noise suppression and control, noise suppression and signal extraction in ultra-low noise (<10 W) systems o sensitive bridge techniques (R, C, L); extensive SQUID experience. o Absorption/emission spectroscopy, monochromators, cold solid-state lasers o Microfabrication, cleanroom experience

o vacuum/UHV system design, assembly, leak testing o leak detectors, pump maintenance and repair

o precision machining, soldering (soft/hard), glassblowing.

• Analytical and Critical Thinking: ability to analyze complex issues and develop effective solutions, diagnosing and troubleshooting; failure-mode analysis

• Detector Development: noble liquid TPCs, superconducting photon sensors, analysis of non-equilibrium dynamics in materials

• Systems Integration: combining optics, cryogenics, mechanics, and electronics into robust platforms, often pursuing “technologically impossible” approaches to resolve long-standing physics challenges

• Attention to Detail: Precision and thoroughness in work to ensure quality.

• Multicultural Collaboration: extensive international research experience in Russia, Germany, Israel, and the U.S., building teams across disciplines.

• Languages: Russian, English; US citizenship; in clearance application process now. Education

M.S. with honors — Moscow Institute of Physics and Technology, Department of Aerospace Engineering (courses include supersonic gas flow dynamics, liquid rocket engines, etc.) Ph.D. in Physics — Kapitsa Institute, Moscow

Thesis: IR Spectroscopy of Excess Electrons in Liquid Helium

• built a coded-aperture soft X-ray camera to study pinch instabilities in hydrogen discharges

• extracting weak signals in multi-wire gas detector to from overwhelming EM noise produced by huge spark

• constructed a custom near-IR spectrophotometer integrated with a cryostat to study excimer molecules in helium crystals down to 250 mK

• built in mid-IR lasers, IR fiber and IR detector into enclosed pressurizes (up to 40 bar) low-temperature He cell and get sensitivity better than 10

-7

in IR absorption

measurements (there were no thermal backgrounds leaking from the room, and other tricks with electron concentration modulation)

• first direct measurements of mid-IR absorption spectra of electron bubbles in helium Employment History

1992–1995 University of Konstanz (Germany), visitor, and Weizmann Institute (Israel), Postdoctoral Fellow

• experimented with instabilities at cryogenic films and interfaces, and discovered unexpected electron emission phenomena in physisorbed helium and hydrogen films

• searched for ways to demonstrate the Josephson effect in superfluid helium- a challenge that had eluded researchers for decades

• studied dynamics of ionization and recombination on the track of heavy ions and found a way to make 10 nm holes in ultra-thin nitrocellulose membranes

• suggested array of nanoscale holes for superfluid helium Josephson junctions

• determined that minor vibrations from the cryostat and the building were the actual cause of decoherence in earlier superfluid Josephson effect experiments. 1995–1997 UC Berkeley, Postdoctoral Researcher

• designed and built a microfluidic cell with flexible Kapton membranes covered with superconducting film, SQUID readout, and array of 100 nm holes microfabricated in silicon nitride membrane as a weak link. This required precision machining, materials selection to match thermal expansion, and integration with SQUID displacement sensors; microfluidic design minimized internal volume transforming the experiment into a vibration-immune Helmholtz resonator- highly increasing stability and resolving decoherence issue.

• observed Josephson oscillations in He for the first time, measure current–phase relationships of the weak link and detect a metastable π-state of junctions 1997–2003 European Facility for Ultra-Low Temperature Physics, Bayreuth (Germany), researcher

• enhanced setups for superfluid He-3 Josephson effect studies

• reproduced the Berkeley experiments and designed setups to apply acoustic pressure modulation, which led to the first observation of the reverse AC Josephson effect

• developed numerically solvable two-fluid hydrodynamic model for Helmholtz resonator experiments that explained our observations and clarified the limits of coherence set by vibrations; find that muons can cause superfluid flows, excite Helmholtz oscillation

• general theorem that an array of small holes can act as a single coherent Josephson junction under well-defined conditions

2003–2007 Rutgers University, researcher

• focused on the characterization of long Ti nanowires and nanoscale bolometer samples at dilution refrigerator temperatures using an AC resistance bridge operated at the very limits of sensitivity

• characterized low temperature material parameters for TES bolometers with SQUID readout for THz astronomy.

• participate in development of fabrication methods for hot-electron nanobolometer, theoretically capable of THz single-photon detection

• Predicted ultra-high sensitivity (NEP <10 W/ Hz) based on material parameters; supported by prototype testing with bridge techniques. 2008–2010 Jet Propulsion Laboratory (JPL), NASA Fellow

• Designed and build test set-up with SQUID readout, cryogenic pulsed mid-IR quantum cascade laser, small solenoid inside superconducting and microwave shields to adjust bolometer transition temperature in 250-30 mK region

• solved the problem of DC SQUID back-action (chirps of Josephson oscillation back- coupling to bolometer driving bolometers into the resistive state) by implementing superconducting low-pass filters, which ensured stable operation

• solved problems of laser drive current (few amps pulses) interference with SQUID operation

• showed, for the first time, energy-resolved detection of individual mid-infrared photons.

• characterized single-photon detection with hot-electron nano-bolometers at 30-250 mK and ~30% energy resolution for 10 µm IR photons; demonstrated NEP ~10 W/ Hz

• find excess noise (above thermal fluctuations of nanobolometer electron system energy) - puzzle leading to understanding of excess backgrounds in neutrino detectors at LLNL 2011–present Lawrence Livermore National Laboratory, Rare Event Detection Group, staff scientist

• put in operation the first dilution refrigeration in our quantum lab

• designed and built noble liquid Ar and Xe detectors with record sensitivity, electric field range - demonstrating single-electron detection. These platforms allowed systematic calibration of electron extraction from liquid into gas.

• measured neutron-induced nuclear recoils to calibrate electrons and photons production in low-energy nuclear recoils in Ar and Xe

• uncovered a fundamental effect: materials at low temperatures often accumulate energy and release it in avalanche-like bursts of photons, phonons, or quasiparticles; this discovery explains excess backgrounds in neutrino and dark matter detectors and suggests a new mechanism for decoherence and correlated errors in qubits

• analyzed mechanisms of excess backgrounds production in noble liquids, NaI(Tl) scintillator, and low-temperature solid-state detectors, proposed verification and remediation strategies

• contributed to SNSPD and MKID detector development, exploring their unique robustness to these relaxation processes

• get patent on mid-IR photon spectroscopy of live cells- potentially, with k-pixel size array of SNSPDs at the focal plane of cold monochromator one can detect and timestamp all near-mid-IR photons emitted by the cell (object of the sell size) with ps time resolution in 1000 spectral channels- which put many interesting questions. Other experiences

In 1998 I warned Gravity Probe B researchers that charges trapped in solid He physisorbed film on gyroscopes will be impossible to remove with UV irradiation Selected Publications & Patents

(Representative; full list available on request)

• S. Pereverzev, Detecting Low-Energy Interactions and Effects of Energy Accumulation in Materials, Phys. Rev. D 105, 063002 (2022).

• S. Pereverzev, Ultra-Low Noise Materials and Devices for Cryogenic Superconductors and Qubits, US Patent 10,318,880.

• T.H. Joshi et al., Ionization Yield of Nuclear Recoils in Liquid Argon, Phys. Rev. Lett. 112, 171303 (2014).

• J. Xu et al., Electron Extraction Efficiency in Dual-Phase Xenon, Phys. Rev. D 99, 103024 (2019).

• B.S. Karasik et al., Energy-Resolved Detection of Single IR Photons, Appl. Phys. Lett. 101, 052601 (2012).

• S. Pereverzev, et. al., Quantum oscillations between two weakly coupled reservoirs of superfluid

3

He. Nature 388, 449–451 (1997). https://doi.org/10.1038/41277

• S. Backhaus et al., Direct Measurement of Current-Phase Relation in He-B Weak Link, Science 278, 1435 (1997).

• S. Pereverzev, A. Ya. Parshin, Spectroscopic Study of Excess Electrons in Liquid Helium, Physica B 197, 347 (1994).

Contact this candidate