J. Arlt

Cloud parameter estimation for interacting BEC after time-of-flight

Rasmus Malthe Fiil Andersen, Stine Frederiksen, Laurits Nikolaj Stokholm, Ilja Zebergs et autres

Abstract Experiments on Bose–Einstein condensates (BECs) at finite temperature typically extract the system parameters, such as temperature, atom number, and condensed fraction from time-of-flight images taken after a free expansion time. This paper systematically examines the effect of repulsive interactions between the …

dk, gb (code pays fourni par la source)

Polarons in atomic gases and two-dimensional semiconductors

Anonymous, Richard Schmidt, G. E. Astrakharchik, Ataç İmamoğlu et autres

In this work we provide a comprehensive review of theoretical and experimental studies of the properties of polarons formed by mobile impurities strongly interacting with quantum many-body systems. We present a unified perspective on the universal concepts and theoretical techniques used to …

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Cloud parameter estimation for interacting BEC after time-of-flight

Rasmus Malthe Fiil Andersen, Stine Frederiksen, Laurits Stokholm, Ilja Zebergs et autres

Experiments on Bose-Einstein condensates at finite temperature typically extract the system parameters, such as temperature, atom number, and condensed fraction from time-of-flight images taken after a free expansion time. This paper systematically examines the effect of repulsive interactions between the condensed and …

On the fluctuations of the number of atoms in the condensate

Maciej Bartłomiej Kruk, Piotr Deuar, Mariusz Gajda, Krzysztof Pawłowski et autres

Bose-Einstein condensation (BEC) represents a remarkable phase transition, characterized by the formation of a single quantum subsystem. As a result, the statistical properties of the condensate are highly unique. In the case of a Bose gas, while the mean number of condensed …

pl, dk (code pays fourni par la source)

Quantum beat spectroscopy of repulsive Bose polarons

Andreas M. Morgen, Steven S. Balling, K. Knakkergaard Nielsen, Thomas Pohl et autres

The physics of impurities in a bosonic quantum environment is a paradigmatic and challenging many-body problem. Here, this problem is investigated for impurities with strong repulsive interactions based on Ramsey interferometry in a quantum degenerate gas of K 39 atoms. We observe …

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On the fluctuations of the number of atoms in the condensate

Maciej Bartłomiej Kruk, P. P. Kulik, Malthe F. Andersen, Piotr Deuar et autres

Bose-Einstein condensation represents a remarkable phase transition, characterized by the formation of a single quantum subsystem. As a result, the statistical properties of the condensate are highly unique. In the case of a Bose gas, while the mean number of condensed atoms …

Atom number fluctuations in Bose gases—statistical analysis of parameter estimation

Toke Vibel, Mikkel Berg Christensen, Rasmus Malthe Fiil Andersen, Laurits Nikolaj Stokholm et autres

Abstract The investigation of atom number fluctuations in quantum gases at finite temperatures showcases the ongoing challenges in understanding complex quantum systems. Recently, the microcanonical nature of atom number fluctuations in weakly interacting Bose–Einstein condensates was observed. This motivates an investigation of …

Spatial calibration of high-density absorption imaging

Toke Vibel, Morten Bondo Christensen, Margit Kristensen, Jeppe Juhl Thuesen et autres

Abstract The accurate determination of atom numbers is an ubiquitous problem in the field of ultracold atoms. For modest atom numbers, absolute calibration techniques are available, however, for large numbers and high densities, the available techniques neglect many-body scattering processes. Here, a …

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Spatial calibration of high-density absorption imaging

Toke Vibel, Mikkel Berg Christensen, Mick Kristensen, Jeppe Juhl Thuesen et autres

The accurate determination of atom numbers is an ubiquitous problem in the field of ultracold atoms. For modest atom numbers, absolute calibration techniques are available, however, for large numbers and high densities, the available techniques neglect many-body scattering processes. Here, a spatial …

The Expansion of Czech Capital to Serbia in 1900-1918 and its Political Aspects: The Case of Pražská úvěrní banka

J. Arlt

This work is devoted to the export of Czech financial capital by nationally Czech banks to the Kingdom of Serbia between 1900 and 1918 and the political aspects of their activities there. The political side of these activities, which was strongly determined …

Quantum beat spectroscopy of repulsive Bose polarons

Andreas M. Morgen, Steven S. Balling, K. Knakkergaard Nielsen, Thomas Pohl et autres

The physics of impurities in a bosonic quantum environment is a paradigmatic and challenging many-body problem that remains to be understood in its full complexity. Here, this problem is investigated for impurities with strong repulsive interactions based on Ramsey interferometry in a …

dk (code pays fourni par la source)

Fock State Sampling Method - Characteristic Temperature of Maximal Fluctuations for Interacting Bosons in Box Potentials

Maciej Bartłomiej Kruk, Toke Vibel, J. Arlt, P. P. Kulik et autres

We study the statistical properties of a gas of interacting bosons trapped in a box potential in two and three dimensions. Our primary focus is the characteristic temperature Tp, i.e., the temperature at which the fluctuations of the number of condensed atoms …

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