ORCID Profile
0000-0002-7356-4814
Current Organisations
University of California, Berkeley
,
Helmholtz-Institute of Physics Mainz
,
Novosibirskij gosudarstvennyj universitet
,
Johannes Gutenberg Universität Mainz
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In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Quantum Physics | Quantum Optics |
Expanding Knowledge in the Physical Sciences | Expanding Knowledge in Technology
Publisher: Springer Science and Business Media LLC
Date: 30-11-2022
DOI: 10.1038/S41467-022-34924-Z
Abstract: Experimental searches for exotic spin-dependent forces are attracting a lot of attention because they allow to test theoretical extensions to the standard model. Here, we report an experimental search for possible exotic spin-dependent force, specifically spin-and-velocity-dependent forces, by using a K-Rb- 21 Ne co-magnetometer and a tungsten ring featuring a high nucleon density. Taking advantage of the high sensitivity of the co-magnetometer, the pseudomagnetic field from this exotic force is measured to be ≤7 aT. This sets limits on coupling constants for the neutron-nucleon and proton-nucleon interactions in the range of ≥0.1 m (mediator boson mass ≤2 μ eV). The coupling constant limits are established to be $$|{g}_{V}^{n}|\,\le \,8.2\times 1{0}^{-11}$$ ∣ g V n ∣ ≤ 8.2 × 1 0 − 11 and $$|{g}_{V}^{p}|\,\le \,3.7\times 1{0}^{-10}$$ ∣ g V p ∣ ≤ 3.7 × 1 0 − 10 , which are more than one order of magnitude tighter than astronomical and cosmological limits on the coupling between the new gauge boson such as Z’ and standard model particles.
Publisher: AIP Publishing
Date: 28-05-2022
DOI: 10.1063/5.0088264
Abstract: We present a comparative analysis of urban magnetic fields between two American cities: Berkeley (California) and Brooklyn Borough of New York City (New York). Our analysis uses data taken over a four-week period during which magnetic field data were continuously recorded using a fluxgate magnetometer with 70 pT/Hz noise. We identified significant differences in the magnetic signatures. In particular, we noticed that Berkeley reaches a near-zero magnetic field activity at night, whereas magnetic activity in Brooklyn continues during nighttime. We also present auxiliary measurements acquired using magnetoresistive vector magnetometers (VMRs), with the noise of 300 pT/Hz, and demonstrate how cross correlation, and frequency-domain analysis, combined with data filtering can be used to extract urban-magnetometry signals and study local anthropogenic activities. Finally, we discuss the potential of using magnetometer networks to characterize the global magnetic field of cities and give directions for future development.
Publisher: American Physical Society (APS)
Date: 10-11-2014
Publisher: American Physical Society (APS)
Date: 29-04-2014
Publisher: MDPI AG
Date: 24-02-2022
DOI: 10.3390/SYM14030459
Abstract: We advocate the idea that Axion Quark Nuggets (AQN) hitting the Earth can be detected by analysing the infrasound, acoustic, and seismic waves which always accompany their passage in the atmosphere and underground. Our estimates for the infrasonic frequency ν≃5 Hz and overpressure δp∼0.3 Pa for relatively large size dark matter (DM) nuggets suggest that sensitivity of presently available instruments is already sufficient to detect very intense (but very rare) events today with existing technology. A study of much more frequent but less intense events requires a new type of instrument. We propose a detection strategy for a systematic study to search for such relatively weak and frequent events by using distributed acoustic sensing and briefly mention other possible detection methods.
Publisher: American Physical Society (APS)
Date: 19-08-2014
Publisher: American Physical Society (APS)
Date: 03-05-2021
Publisher: Wiley
Date: 31-01-2022
Abstract: The Gamma Factory (GF) is an ambitious proposal, currently explored within the CERN Physics Beyond Colliders program, for a source of photons with energies up to ≈400 MeV and photon fluxes (up to ≈10 17 photons s −1 ) exceeding those of the currently available gamma sources by orders of magnitude. The high‐energy (secondary) photons are produced via resonant scattering of the primary laser photons by highly relativistic partially‐stripped ions circulating in the accelerator. The secondary photons are emitted in a narrow cone and the energy of the beam can be monochromatized, down to 10 −3 –10 −6 level, via collimation, at the expense of the photon flux. This paper surveys the new opportunities that may be afforded by the GF in nuclear physics and related fields.
Publisher: American Physical Society (APS)
Date: 08-02-2006
Publisher: Elsevier BV
Date: 03-2019
Publisher: Optica Publishing Group
Date: 29-07-2020
DOI: 10.1364/JOSAB.395087
Abstract: We report on spiking dynamics of frequency upconverted emission at 420 nm generated on the 6 P 3 / 2 − 5 S 1 / 2 transition in Rb vapor two-photon excited to the 5 D 5 / 2 level with laser light at 780 and 776 nm. The spike duration is shorter than the natural lifetime of any excited level involved in the interaction with both continuous and pulsed pump radiation. The spikes at 420 nm are attributed to temporal properties of the directional emission at 5.23 µm generated on the population-inverted 5 D 5 / 2 − 6 P 3 / 2 transition. A link between the spiking regime and cooperative effects is discussed. We suggest that the observed stochastic behavior is due to the quantum-mechanical nature of the cooperative effects rather than random fluctuation of the applied laser fields.
Publisher: IOP Publishing
Date: 07-09-2015
Publisher: Research Square Platform LLC
Date: 07-04-2021
DOI: 10.21203/RS.3.RS-298059/V1
Abstract: Results are reported from the first full-scale search for transient signals from exotic fields of astrophysical origin using data from a newly constructed Earth-scale detector: the Global Network of Optical Magnetometers for Exotic physics searches (GNOME). Data collected by the GNOME consist of correlated measurements from optical atomic magnetometers located in laboratories all over the world. GNOME data are searched for patterns of signals propagating through the network consistent with exotic fields composed of ultralight bosons such as axion-like particles (ALPs). Analysis of data from a continuous month-long operation of the GNOME finds no statistically significant signals consistent with those expected due to encounters with topological defects (axion domain walls), placing new experimental constraints on such dark matter scenarios.
Publisher: Springer Science and Business Media LLC
Date: 12-2021
DOI: 10.1038/S41567-021-01393-Y
Abstract: Ultralight bosons such as axion-like particles are viable candidates for dark matter. They can form stable, macroscopic field configurations in the form of topological defects that could concentrate the dark matter density into many distinct, compact spatial regions that are small compared with the Galaxy but much larger than the Earth. Here we report the results of the search for transient signals from the domain walls of axion-like particles by using the global network of optical magnetometers for exotic (GNOME) physics searches. We search the data, consisting of correlated measurements from optical atomic magnetometers located in laboratories all over the world, for patterns of signals propagating through the network consistent with domain walls. The analysis of these data from a continuous month-long operation of GNOME finds no statistically significant signals, thus placing experimental constraints on such dark matter scenarios.
Publisher: American Physical Society (APS)
Date: 28-04-0001
Publisher: American Physical Society (APS)
Date: 17-02-2022
Publisher: American Physical Society (APS)
Date: 28-07-2014
Publisher: American Physical Society (APS)
Date: 26-04-2023
Publisher: Springer Science and Business Media LLC
Date: 05-01-2016
DOI: 10.1038/NCOMMS10211
Abstract: Electron spin resonance (ESR) describes a suite of techniques for characterizing electronic systems with applications in physics, chemistry, and biology. However, the requirement for large electron spin ensembles in conventional ESR techniques limits their spatial resolution. Here we present a method for measuring ESR spectra of nanoscale electronic environments by measuring the longitudinal relaxation time of a single-spin probe as it is systematically tuned into resonance with the target electronic system. As a proof of concept, we extracted the spectral distribution for the P1 electronic spin bath in diamond by using an ensemble of nitrogen-vacancy centres, and demonstrated excellent agreement with theoretical expectations. As the response of each nitrogen-vacancy spin in this experiment is dominated by a single P1 spin at a mean distance of 2.7 nm, the application of this technique to the single nitrogen-vacancy case will enable nanoscale ESR spectroscopy of atomic and molecular spin systems.
Publisher: American Astronomical Society
Date: 02-2019
Publisher: American Physical Society (APS)
Date: 16-10-2013
Publisher: American Physical Society (APS)
Date: 17-02-2022
Publisher: IOP Publishing
Date: 18-11-2022
Abstract: We present a concept for a high-precision optical atomic clock (OAC) operating on an Earth-orbiting space station. This pathfinder science mission will compare the space-based OAC with one or more ultra-stable terrestrial OACs to search for space-time-dependent signatures of dark scalar fields that manifest as anomalies in the relative frequencies of station-based and ground-based clocks. This opens the possibility of probing models of new physics that are inaccessible to purely ground-based OAC experiments where a dark scalar field may potentially be strongly screened near Earth’s surface. This unique enhancement of sensitivity to potential dark matter candidates harnesses the potential of space-based OACs.
Publisher: Springer Science and Business Media LLC
Date: 06-04-2014
Publisher: American Physical Society (APS)
Date: 29-07-2013
Location: United States of America
Location: United States of America
Location: Russian Federation
Start Date: 03-2015
End Date: 12-2018
Amount: $561,800.00
Funder: Australian Research Council
View Funded Activity