ORCID Profile
0000-0003-4910-2115
Current Organisation
Polska Akademia Nauk Instytut Fizyki
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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 | Degenerate Quantum Gases and Atom Optics | Electronic and Magnetic Properties of Condensed Matter; Superconductivity | Condensed Matter Modelling and Density Functional Theory
Expanding Knowledge in the Physical Sciences | Energy Transmission and Distribution (excl. Hydrogen) | Mineral Exploration not elsewhere classified |
Publisher: Springer Science and Business Media LLC
Date: 28-06-2011
Publisher: IOP Publishing
Date: 18-01-2006
Publisher: Informa UK Limited
Date: 10-11-2007
Publisher: American Physical Society (APS)
Date: 15-04-2010
Publisher: Springer Science and Business Media LLC
Date: 19-03-2021
DOI: 10.1038/S41598-021-85298-Z
Abstract: We study the spin distillation of spinor gases of bosonic atoms and find two different mechanisms in $${}^{52}$$ 52 Cr and $$^{23}$$ 23 Na atoms, both of which can cool effectively. The first mechanism involves dipolar scattering into initially unoccupied spin states and cools only above a threshold magnetic field. The second proceeds via equilibrium relaxation of the thermal cloud into empty spin states, reducing its proportion in the initial component. It cools only below a threshold magnetic field. The technique was initially demonstrated experimentally for a chromium dipolar gas (Naylor et al. in Phys Rev Lett 115:243002, 2015), whereas here we develop the concept further and provide an in-depth understanding of the required physics and limitations involved. Through numerical simulations, we reveal the mechanisms involved and demonstrate that the spin distillation cycle can be repeated several times, each time resulting in a significant additional reduction of the thermal atom fraction. Threshold values of magnetic field and predictions for the achievable temperature are also identified.
Publisher: IOP Publishing
Date: 11-05-2000
Publisher: American Physical Society (APS)
Date: 05-02-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3SM01046E
Publisher: American Chemical Society (ACS)
Date: 09-02-2023
Publisher: Springer Science and Business Media LLC
Date: 08-2022
DOI: 10.1038/S41598-022-16477-9
Abstract: We present observations of the high momentum tail in expanding Bose–Einstein condensates of metastable Helium atoms released from a harmonic trap. The far-field density profile exhibits features that support identification of the tails of the momentum distribution as originating in the in-situ quantum depletion prior to release. Thus, we corroborate recent observations of slowly-decaying tails in the far-field beyond the thermal component. This observation is in conflict with the hydrodynamic theory, which predicts that the in-situ depletion does not survive when atoms are released from a trap. Indeed, the depleted tails even appear stronger in the far-field than expected before release, and we discuss the challenges of interpreting this in terms of the Tan contact in the trapped gas. In complement to these observations, full quantum simulations of the experiment show that, under the right conditions, the depletion can persist into the far field after expansion. Moreover, the simulations provide mechanisms for survival and for the the large-momentum tails to appear stronger after expansion due to an acceleration of the depleted atoms by the mean-field potential. However, while in qualitative agreement, the final depletion observed in the experiment is much larger than in the simulation.
Publisher: American Physical Society (APS)
Date: 13-07-2017
Publisher: IOP Publishing
Date: 05-12-2017
Publisher: AIP Publishing
Date: 06-2023
DOI: 10.1063/5.0153676
Abstract: Droplet coalescence is an important process in nature and various technologies (e.g., inkjet printing). Here, we unveil the surfactant mass transport mechanism and report on several major differences in the coalescence of surfactant-laden droplets as compared to pure water droplets by means of molecular dynamics simulation of a coarse-grained model. Large-scale changes to bridge growth dynamics are identified, such as the lack of multiple thermally excited precursors, attenuated collective excitations after contact, slowing down in the inertial regime due to aggregate-induced rigidity and reduced water flow, and a slowing down in the coalescence rate (deceleration) when surfactant concentration increases, while at the same time, we also confirm the existence of an initial thermal, and a power-law, inertial, regime of the bridge growth dynamics in both the pure and the surfactant-laden droplets. Thus, we unveil the key mechanisms in one of the fundamental topological processes of liquid droplets containing surfactant, which is crucial in relevant technologies.
Publisher: American Physical Society (APS)
Date: 17-08-2018
Publisher: American Physical Society (APS)
Date: 30-03-2011
Publisher: Elsevier BV
Date: 11-2016
Publisher: American Physical Society (APS)
Date: 13-04-1998
Publisher: American Physical Society (APS)
Date: 08-09-2017
Publisher: American Physical Society (APS)
Date: 13-11-2012
Publisher: Pleiades Publishing Ltd
Date: 07-2007
Publisher: American Physical Society (APS)
Date: 08-09-2000
Publisher: American Physical Society (APS)
Date: 28-06-2010
Publisher: American Physical Society (APS)
Date: 12-09-2014
Publisher: American Physical Society (APS)
Date: 02-11-2010
Publisher: IOP Publishing
Date: 06-2003
Publisher: WORLD SCIENTIFIC
Date: 02-2004
Publisher: American Physical Society (APS)
Date: 29-01-2004
Publisher: American Physical Society (APS)
Date: 25-06-2012
Publisher: American Physical Society (APS)
Date: 20-09-2002
Publisher: AIP Publishing
Date: 07-2023
DOI: 10.1063/5.0157752
Abstract: The breakup of liquid threads into smaller droplets is a fundamental problem in fluid dynamics. In this study, we estimate the characteristic wavelength of the breakup process by means of many-body dissipative particle dynamics. This wavelength shows a power-law dependence on the Ohnesorge number in line with results from stability analysis. We also discover that the number of satellite droplets exhibits a power-law decay with exponent 0.72 ± 0.04 in the product of the Ohnesorge and thermal capillary numbers, while the overall size of main droplets is larger than that based on the characteristic wavelength thanks to the asynchronous breakup of the thread. Finally, we show that the formation of satellite droplets is the result of the advection of pinching points toward the main droplets in a remaining thinning neck, when the velocity gradient of the fluid exhibits two symmetric maxima.
Publisher: Elsevier BV
Date: 12-2001
Publisher: American Physical Society (APS)
Date: 11-07-2013
Publisher: American Physical Society (APS)
Date: 12-05-2000
Publisher: IOP Publishing
Date: 03-2006
Publisher: Ivyspring International Publisher
Date: 2018
DOI: 10.7150/JCA.22329
Publisher: American Physical Society (APS)
Date: 12-1999
Publisher: American Physical Society (APS)
Date: 13-12-2000
Publisher: American Physical Society (APS)
Date: 06-04-2005
Publisher: American Physical Society (APS)
Date: 15-02-2019
Publisher: American Physical Society (APS)
Date: 22-09-2009
Publisher: AIP Publishing
Date: 09-2022
DOI: 10.1063/5.0101930
Abstract: Atmospheric aerosols can consist of inorganic and organic substances, including surfactants at a significant concentration. Importantly, the latter can reduce the surface tension at the liquid–vapor surfaces, where they preferentially adsorb due to their hiphilic structure. As a result, processes such as droplet coalescence, development of precipitation, and ultimately cloud lifetime may depend on the presence of surfactants in the aerosols. Here, we present a numerical model for cloud droplet formation, which is based on the Lagrangian particle-based microphysics-scheme superdroplet method and takes into account the presence of the surfactant in the droplets. Our results show that surfactant facilitates cloud formation by increasing the number and size of activated droplets, which concentrate at the bottom of the cloud, while the largest droplets are concentrated at the top of the cloud. This indicates a circulation of droplets that involves activation and growth processes from the bottom of the cloud toward the top. Moreover, our conclusions are independent of the particular approach used for modeling the diffusion of Eulerian variables due to the subgrid-scale turbulence. We anticipate that our results will enrich our understanding of the role of surfactants in the behavior of atmospheric aerosols and, importantly, will pave the way for further developments in the numerical modeling of systems with surfactants at macroscopic scales.
Publisher: American Physical Society (APS)
Date: 08-02-2010
Publisher: Informa UK Limited
Date: 07-2002
Publisher: American Physical Society (APS)
Date: 20-04-2009
Publisher: Elsevier BV
Date: 05-1998
Publisher: American Physical Society (APS)
Date: 20-06-2011
Publisher: American Physical Society (APS)
Date: 10-12-2015
Publisher: American Physical Society (APS)
Date: 04-10-2013
Publisher: American Physical Society (APS)
Date: 11-05-2018
Publisher: Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften
Date: 10-05-2021
DOI: 10.22331/Q-2021-05-10-455
Abstract: A number of physically intuitive results for the calculation of multi-time correlations in phase-space representations of quantum mechanics are obtained. They relate time-dependent stochastic s les to multi-time observables, and rely on the presence of derivative-free operator identities. In particular, expressions for time-ordered normal-ordered observables in the positive-P distribution are derived which replace Heisenberg operators with the bare time-dependent stochastic variables, confirming extension of earlier such results for the Glauber-Sudarshan P. Analogous expressions are found for the anti-normal-ordered case of the doubled phase-space Q representation, along with conversion rules among doubled phase-space s-ordered representations. The latter are then shown to be readily exploited to further calculate anti-normal and mixed-ordered multi-time observables in the positive-P, Wigner, and doubled-Wigner representations. Which mixed-order observables are amenable and which are not is indicated, and explicit tallies are given up to 4th order. Overall, the theory of quantum multi-time observables in phase-space representations is extended, allowing non-perturbative treatment of many cases. The accuracy, usability, and scalability of the results to large systems is demonstrated using stochastic simulations of the unconventional photon blockade system and a related Bose-Hubbard chain. In addition, a robust but simple algorithm for integration of stochastic equations for phase-space s les is provided.
Publisher: American Physical Society (APS)
Date: 23-03-2007
Location: United Kingdom of Great Britain and Northern Ireland
Start Date: 2019
End Date: 2024
Funder: Narodowe Centrum Nauki
View Funded ActivityStart Date: 2019
End Date: 2021
Funder: Australian Research Council
View Funded ActivityStart Date: 2013
End Date: 2016
Funder: Australian Research Council
View Funded ActivityStart Date: 2015
End Date: 2015
Funder: Ministerstwo Nauki i Szkolnictwa Wyższego
View Funded ActivityStart Date: 2007
End Date: 2009
Funder: Research Executive Agency
View Funded ActivityStart Date: 2010
End Date: 2013
Funder: Research Executive Agency
View Funded ActivityStart Date: 2010
End Date: 2012
Funder: Narodowe Centrum Nauki
View Funded ActivityStart Date: 2010
End Date: 2013
Funder: Ministerstwo Nauki i Szkolnictwa Wyższego
View Funded ActivityStart Date: 2013
End Date: 2019
Funder: Narodowe Centrum Nauki
View Funded ActivityStart Date: 03-2019
End Date: 12-2023
Amount: $505,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2013
End Date: 12-2016
Amount: $315,000.00
Funder: Australian Research Council
View Funded Activity