Zobrazeno 1 - 10
of 1 084
pro vyhledávání: '"Koehl, M."'
We measure the equation of state in a bilayer Hubbard system for different ratios of the two tunnelling amplitudes $t_\perp /t$. From the equation of state we deduce the compressibility and observe its dependency on $t_\perp /t$. Moreover, we infer t
Externí odkaz:
http://arxiv.org/abs/2407.11863
Publikováno v:
Phys. Rev. Lett. 130, 203401 (2023)
We determine the phase diagram of strongly correlated fermions in the crossover from Bose-Einstein condensates of molecules (BEC) to Cooper pairs of fermions (BCS) utilizing an artificial neural network. By applying advanced image recognition techniq
Externí odkaz:
http://arxiv.org/abs/2310.16006
Publikováno v:
Phys. Rev. A 108, 063303 (2023)
We study the critical temperature of the superfluid phase transition of strongly-interacting fermions in the crossover regime between a Bardeen-Cooper-Schrieffer (BCS) superconductor and a Bose-Einstein condensate (BEC) of dimers. To this end, we emp
Externí odkaz:
http://arxiv.org/abs/2310.15989
Publikováno v:
Rev. Sci. Instrum. 92, 093202 (2021)
Cold atom experiments commonly use broad magnetic Feshbach resonances to manipulate the interaction between atoms. In order to induce quantum dynamics by a change of the interaction strength, rapid ($\sim\mu s$) magnetic field changes over several te
Externí odkaz:
http://arxiv.org/abs/2103.05273
The mechanism of fermionic pairing is the key to understanding various phenomena such as high-temperature superconductivity and the pseudogap phase in cuprate materials. We study the pair correlations in the attractive Hubbard model using ultracold f
Externí odkaz:
http://arxiv.org/abs/2005.09121
Autor:
Behrle, A., Harrison, T., Kombe, J., Gao, K., Link, M., Bernier, J. -S., Kollath, C., Köhl, M.
Publikováno v:
Nature Physics 14, 781 (2018)
Higgs and Goldstone modes are possible collective modes of an order parameter upon spontaneously breaking a continuous symmetry. Whereas the low-energy Goldstone (phase) mode is always stable, additional symmetries are required to prevent the Higgs (
Externí odkaz:
http://arxiv.org/abs/1912.01867
Publikováno v:
Phys. Rev. Lett. 124, 010403 (2020)
We study the particle-hole symmetry in the Hubbard model using ultracold fermionic atoms in an optical lattice. We demonstrate the mapping between charge and spin degrees of freedom and, in particular, show the occurrence of a state with "incompressi
Externí odkaz:
http://arxiv.org/abs/1907.09045
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. A 95, 033812 (2017)
We study the behavior of a single laser-driven trapped ion inside a microscopic optical Fabry-Perot cavity. In particular, we demonstrate a fiber Fabry-Perot cavity operating on the principal $S_{1/2}\to P_{1/2}$ electric dipole transition of an Yb$^
Externí odkaz:
http://arxiv.org/abs/1609.04997