Zobrazeno 1 - 10
of 76
pro vyhledávání: '"Brennecke, F"'
Autor:
Wurz, N., Chan, C. F., Gall, M., Drewes, J. H., Cocchi, E., Miller, L. A., Pertot, D., Brennecke, F., Köhl, M.
Publikováno v:
Phys. Rev. A 97, 051602 (2018)
We coherently manipulate spin correlations in a two-component atomic Fermi gas loaded into an optical lattice using spatially and time-resolved Ramsey spectroscopy combined with high-resolution \textit{in situ} imaging. This novel technique allows us
Externí odkaz:
http://arxiv.org/abs/1709.08231
Publikováno v:
Phys. Rev. X 7, 031025 (2017)
We measure pressure and entropy of ultracold fermionic atoms in an optical lattice for a range of interaction strengths, temperatures and fillings. Our measurements demonstrate that, for low enough temperatures, entropy-rich regions form locally in t
Externí odkaz:
http://arxiv.org/abs/1612.04627
Publikováno v:
Phys. Rev. Lett. 118, 170401 (2017)
Near zero temperature, quantum magnetism can non-trivially arise from short-range interactions, but the occurrence of magnetic order depends crucially on the interplay of interactions, lattice geometry, dimensionality and doping. Even though the cons
Externí odkaz:
http://arxiv.org/abs/1607.00392
Publikováno v:
Phys. Rev. Lett. 117, 135301 (2016)
The crossover between a metal and a Mott insulator leads to a localization of fermions from delocalized Bloch states to localized states. We experimentally study this crossover using fermionic atoms in an optical lattice by measuring thermodynamic an
Externí odkaz:
http://arxiv.org/abs/1606.04580
Publikováno v:
Phys. Rev. A 94, 033626 (2016)
Bose-Einstein condensates of ultracold atoms can be used to sense fluctuations of the magnetic field by means of transitions into untrapped hyperfine states. It has been shown recently that counting the outcoupled atoms can yield the power spectrum o
Externí odkaz:
http://arxiv.org/abs/1605.09611
Publikováno v:
Phys. Rev. A 94, 023632 (2016)
We study a system with competing short- and global-range interactions in the framework of the Bose-Hubbard model. Using a mean-field approximation we obtain the phase diagram of the system and observe four different phases: a superfluid, a supersolid
Externí odkaz:
http://arxiv.org/abs/1604.00865
Publikováno v:
Science 336, 1570 (2012)
Long-range interactions in quantum gases are predicted to give rise to an excitation spectrum of roton character, similar to that observed in superfluid helium. We investigate the excitation spectrum of a Bose-Einstein condensate with cavity-mediated
Externí odkaz:
http://arxiv.org/abs/1203.1322
Publikováno v:
Phys. Rev. Lett. 107, 140402 (2011)
We study symmetry breaking at the Dicke quantum phase transition by coupling a motional degree of freedom of a Bose-Einstein condensate to the field of an optical cavity. Using an optical heterodyne detection scheme we observe symmetry breaking in re
Externí odkaz:
http://arxiv.org/abs/1105.0426
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A Bose-Einstein condensate is dispersively coupled to a single mode of an ultra-high finesse optical cavity. The system is governed by strong interactions between the atomic motion and the light field even at the level of single quanta. While coheren
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od_______805::ebc9aec907c9bade52974ec1334d9a53
http://doc.rero.ch/record/320740/files/340_2009_Article_3436.pdf
http://doc.rero.ch/record/320740/files/340_2009_Article_3436.pdf