Unravelling Interaction and Temperature Contributions in Unpolarized Trapped Fermionic Atoms in the BCS Regime

• URL: http://arxiv.org/abs/2311.08853v1
• Date: Wed, 15 Nov 2023 10:45:38 GMT
• Title: Unravelling Interaction and Temperature Contributions in Unpolarized Trapped Fermionic Atoms in the BCS Regime
• Authors: Sejung Yong, Sian Barbosa, Jennifer Koch, Felix Lang, Axel Pelster, Artur Widera
• Abstract summary: In the BCS limit density profiles for unpolarized trapped fermionic clouds of atoms are largely featureless. Temperature measurements have so far been mostly considered in an indirect way, where one sweeps isentropically from the BCS to the BEC limit. We suggest here a direct thermometry, which relies on measuring the column density and comparing the obtained data with a Hartree-Bogoliubov mean-field theory combined with a local density approximation.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In the BCS limit density profiles for unpolarized trapped fermionic clouds of atoms are largely featureless. Therefore, it is a delicate task to analyze them in order to quantify their respective interaction and temperature contributions. Temperature measurements have so far been mostly considered in an indirect way, where one sweeps isentropically from the BCS to the BEC limit. Instead we suggest here a direct thermometry, which relies on measuring the column density and comparing the obtained data with a Hartree-Bogoliubov mean-field theory combined with a local density approximation. In case of an attractive interaction between two-components of $^{6}$Li atoms trapped in a tri-axial harmonic confinement we show that minimizing the error within such an experiment-theory collaboration turns out to be a reasonable criterion for analyzing in detail measured densities and, thus, for ultimately determining the sample temperatures. The findings are discussed in view of various possible sources of errors.

Related papers

• Tripartite entanglement from experimental data: $B^0\to K^{*0}μ^+μ^-$ as a case study [49.1574468325115]
  We develop an angular analysis based on the reconstruction of the helicity amplitudes from dedicated experimental data corresponding to the tripartite state composed by one qutrit and two qubits. As an application of our analysis, we performed a full quantum tomography of the final state in the $B0to K*0mu+mu-$ decays using data recorded by LHCb collaboration.
  arXiv  Detail & Related papers  (2024-09-19T18:10:14Z)
• Production and stabilization of a spin mixture of ultracold dipolar Bose gases [39.58317527488534]
  We present experimental results for a mixture composed of the two lowest Zeeman states of $162$Dy atoms. Due to an interference phenomenon, the rate for such inelastic processes is dramatically reduced with respect to the Wigner threshold law.
  arXiv  Detail & Related papers  (2024-07-11T17:37:01Z)
• Phase diagram of non-Hermitian BCS superfluids in a dissipative asymmetric Hubbard model [0.0]
  We investigate the non-Hermitian (NH) attractive Fermi-Hubbard model with asymmetric hopping and complex-valued interactions. We find that the weak asymmetry of the hopping does not affect the BCS superfluidity since it only affects the imaginary part of the eigenvalues of the BdG Hamiltonian.
  arXiv  Detail & Related papers  (2024-06-24T09:37:04Z)
• Thermal entanglement in conformal junctions [0.0]
  We consider a quantum junction described by a 1+1-dimensional boundary conformal field theory (BCFT) Our analysis focuses on correlations emerging at finite temperature, achieved through the computation of entanglement measures.
  arXiv  Detail & Related papers  (2023-12-13T16:43:56Z)
• Bayesian inference of composition-dependent phase diagrams [47.79947989845143]
  We develop a method in which Bayesian inference is employed to combine thermodynamic data from molecular dynamics (MD), melting point simulations, and phonon calculations, process these data, and yield a temperature-concentration phase diagram. The developed algorithm was successfully tested on two binary systems, Ge-Si and K-Na, in the full range of concentrations and temperatures.
  arXiv  Detail & Related papers  (2023-09-03T20:57:10Z)
• Thermometry by correlated dephasing of impurities in a 1D Fermi gas [0.0]
  We investigate the pure dephasing dynamics of two static impurity qubits embedded within a common Fermi gas. We show that the impurities become correlated via retarded interactions of the Ruderman-Kittel-Kasuya-Yosida type. These correlations can provide a metrological advantage, enhancing the sensitivity of the two-qubit thermometer beyond that of two independent impurities.
  arXiv  Detail & Related papers  (2023-07-19T16:55:35Z)
• Quantum Monte Carlo study of the role of p-wave interactions in ultracold repulsive Fermi gases [0.0]
  We investigate the ground-state properties of single-component Fermi gases with short-range repulsive interactions. A comparison against recently derived second-order perturbative results shows good agreement in a broad range of interaction strength. We find remarkable agreement with a recently derived fourth-order expansion that includes $p$-wave contributions.
  arXiv  Detail & Related papers  (2022-12-18T20:08:32Z)
• Full counting statistics of interacting lattice gases after an expansion: The role of the condensate depletion in the many-body coherence [55.41644538483948]
  We study the full counting statistics (FCS) of quantum gases in samples of thousands of interacting bosons. FCS reveals the many-body coherence from which we characterize iconic states of interacting lattice bosons.
  arXiv  Detail & Related papers  (2022-07-28T13:21:57Z)
• Optimal nonequilibrium thermometry in Markovian environments [0.0]
  We find that for a general class of sample-probe interactions the scaling of the measurement uncertainty is inversely proportional to the time of the process. We show that the Lamb shift induced by the probe-sample interaction can play a relevant role in thermometry.
  arXiv  Detail & Related papers  (2021-07-09T13:19:42Z)
• Uhlmann Fidelity and Fidelity Susceptibility for Integrable Spin Chains at Finite Temperature: Exact Results [68.8204255655161]
  We show that the proper inclusion of the odd parity subspace leads to the enhancement of maximal fidelity susceptibility in the intermediate range of temperatures. The correct low-temperature behavior is captured by an approximation involving the two lowest many-body energy eigenstates.
  arXiv  Detail & Related papers  (2021-05-11T14:08:02Z)
• Probing eigenstate thermalization in quantum simulators via fluctuation-dissipation relations [77.34726150561087]
  The eigenstate thermalization hypothesis (ETH) offers a universal mechanism for the approach to equilibrium of closed quantum many-body systems. Here, we propose a theory-independent route to probe the full ETH in quantum simulators by observing the emergence of fluctuation-dissipation relations. Our work presents a theory-independent way to characterize thermalization in quantum simulators and paves the way to quantum simulate condensed matter pump-probe experiments.
  arXiv  Detail & Related papers  (2020-07-20T18:00:02Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.