Article
Multidisciplinary Sciences
Hideki Konishi, Kevin Roux, Victor Helson, Jean-Philippe Brantut
Summary: Directly coupling cavity photons to pairs of atoms in a strongly interacting Fermi gas generates pair polaritons-hybrid excitations coherently mixing photons, atom pairs and molecules.
Article
Optics
Peng Zou, Huaisong Zhao, Lianyi He, Xia-Ji Liu, Hui Hu
Summary: By studying the dynamic structure factors of a strongly interacting Fermi superfluid, it is possible to differentiate between the characteristics of conventional BCS superfluid and Sarma superfluid in different phase transitions, especially in the Bose-Einstein-condensate-like regime of the Fermi superfluid.
Article
Physics, Multidisciplinary
Xin Wang, Xiang Li, Ilya Arakelyan, J. E. Thomas
Summary: In this study, we measure the free decay of a spatially periodic density profile in a strongly interacting Fermi gas with a high temperature. The results provide direct measurements of the thermal conductivity and the shear viscosity, obtained from the time-dependent evolution.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Andrea Barresi, Antoine Boulet, Gabriel Wlazlowski, Piotr Magierski
Summary: We investigate the life cycle of the large amplitude Higgs mode in strongly interacting superfluid Fermi gas. Through numerical simulations and the technique of the interaction quench, we verify the previous theoretical predictions on the mode's frequency. We also demonstrate the mode's dynamic instability against external perturbation and examine the post-decay state characterized by spatial fluctuations at scales comparable to the superfluid coherence length, showing similarities with FFLO states in higher dimensionalities and nonzero spin imbalances.
SCIENTIFIC REPORTS
(2023)
Article
Optics
Jia Wang, Xia-Ji Liu, Hui Hu
Summary: In this study, an exact relation between Tan's universal contact and the photoexcitation rate of a strongly interacting Fermi gas is theoretically derived and experimentally validated. The research findings provide important insights for accurately measuring the Tan's contact coefficient at finite temperatures in future experiments.
Article
Physics, Multidisciplinary
M. Link, K. Gao, A. Kell, M. Breyer, D. Eberz, B. Rauf, M. Koehl
Summary: The phase diagram of strongly correlated fermions in the BEC-BCS crossover is determined using an artificial neural network. By utilizing advanced image recognition techniques on the momentum distribution of the fermions, previously considered as featureless, the critical temperature is measured and shown to exhibit a maximum on the bosonic side of the crossover. Moreover, the trained neural network is analyzed to interpret physically relevant quantities.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
K. Welz, M. Gerken, B. Zhu, E. Lippi, M. Rautenberg, L. Chomaz, M. Weidemueller
Summary: We theoretically investigate three-body losses in a single-component Fermi gas near a p-wave Feshbach resonance in the interacting, nonunitary regime. We extend the cascade model introduced by Waseem et al. [M. Waseem, J. Yoshida, T. Saito, and T. Mukaiyama, Phys. Rev. A 99, 052704 (2019)] to describe the elastic and inelastic collision processes. We find that the loss behavior exhibits a n3 and an anomalous n2 density dependence for a ratio of elastic-to-inelastic collision rate larger and smaller than 1, respectively. The corresponding evolutions of the energy distribution show collisional cooling or evolution toward low-energetic nonthermalized steady states, respectively. These findings are particularly relevant for understanding atom loss and the energetic evolution of ultracold gases of fermionic lithium atoms in their ground state.
Article
Multidisciplinary Sciences
T. -W. Zhou, G. Cappellini, D. Tusi, L. Franchi, J. Parravicini, C. Repellin, S. Greschner, M. Inguscio, T. Giamarchi, M. Filippone, J. Catani, L. Fallani
Summary: The Hall effect, which describes the motion of charged particles in magnetic fields, has important implications for material properties. Understanding this effect in interacting systems is challenging, even for small magnetic fields. In this study, we used an atomic quantum simulator to investigate the behavior of ultracold fermions in the presence of artificial magnetic fields. Through experimental measurements, we observed a universal behavior of the Hall response, which is independent of the strength of atomic interactions. This research demonstrates the capability of quantum simulation to describe strongly correlated topological states of matter.
Article
Optics
Isabella Fritsche, Cosetta Baroni, Erich Dobler, Emil Kirilov, Bo Huang, Rudolf Grimm, Georg M. Bruun, Pietro Massignan
Summary: In this experiment, the properties of a strongly interacting mixture of bosonic K-41 impurities in a Fermi sea of ultracold Li-6 atoms were investigated. By using radio-frequency injection spectroscopy and manipulating interspecies interactions with a Feshbach resonance, the researchers found that the energy of Fermi polarons was insensitive to impurity concentration. The breakdown of the Fermi polaron description was observed in the denser condensed fraction of the bosonic K-41 gas, where Bose polarons formed by Li-6 fermions were detected.
Article
Physics, Multidisciplinary
Pietro Massignan, Nikolay Yegovtsev, Victor Gurarie
Summary: The study shows that in a strongly interacting Bose gas, the quasiparticle properties of a heavy Bose polaron depend on the impurity-boson potential through a single parameter that characterizes its range.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Fabio Briscese
Summary: This article discusses the effect of inter-atom interactions on the condensation temperature of an atomic Bose-Einstein condensate and presents an analytic expression for this effect. By studying strongly interacting 39K condensates, it is shown that the tension between mean-field predictions and observations can be resolved by considering the details of the Feshbach resonance used to tune the interactions.
Article
Optics
Hui Hu, Jia Wang, Jing Zhou, Xia-Ji Liu
Summary: This paper investigates the zero-temperature quasiparticle properties of a mobile impurity in a strongly interacting Fermi superfluid. It shows that the repulsive polaron branch becomes less well defined due to the existence of a significant pairing gap Delta, while the attractive polaron branch becomes more robust at finite momentum.
Article
Physics, Multidisciplinary
Marcel Duda, Xing-Yan Chen, Andreas Schindewolf, Roman Bause, Jonas von Milczewski, Richard Schmidt, Immanuel Bloch, Xin-Yu Luo
Summary: The interplay of quantum statistics and interactions in atomic Bose-Fermi mixtures results in a phase transition from a polaronic to a molecular phase, leading to the emergence of a molecular Fermi gas. This represents a new phenomenon complementary to the Bose-Einstein condensate/Bardeen-Cooper-Schrieffer crossover observed in Fermi systems. By tuning interspecies interactions, heteronuclear molecules can be generated in the quantum-degenerate regime.
Article
Optics
Nikolay Yegovtsev, Pietro Massignan, Victor Gurarie
Summary: This paper examines strong boson-impurity interactions with finite range in a Bose gas. It shows that for attractive impurity-boson interactions, including the unitary point, static properties of a Bose polaron in a dilute Bose gas can be calculated using the scattering length and an additional parameter characterizing the range of the interactions.
Article
Physics, Multidisciplinary
Jesper Levinsen, Luis A. Pena Ardila, Shuhei M. Yoshida, Meera M. Parish
Summary: In this study, the interaction between an infinitely heavy impurity and a dilute Bose gas at zero temperature was investigated. It was found that boson-boson interactions induce a quantum blockade effect, affecting the formation and energy of the polaron. The combination of quantum Monte Carlo methods and truncated basis approach can effectively reveal the quantum correlations between bosons.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Lucas Platter
Article
Physics, Nuclear
J. Braun, H. -W. Hammer, L. Platter
EUROPEAN PHYSICAL JOURNAL A
(2018)
Article
Physics, Nuclear
Samuel B. Emmons, Chen Ji, Lucas Platter
Summary: In this study, the longitudinal structure function of the deuteron is calculated up to next-to-next-to-leading order within the framework of pionless effective field theory. These calculations are used to determine the two-photon polarizability contribution to the Lamb shift in muonic deuterium, allowing for the extraction of the nuclear charge radius of the deuteron. The analytical expressions for relevant transition matrix elements and the longitudinal structure function, as well as numerical results for the corresponding contributions to the Lamb shift, are presented. The impact of relativistic and higher-order effects is also discussed, with the findings showing agreement with previous calculations and an explanation for the accuracy of the current calculation.
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Wael Elkamhawy, Zichao Yang, Hans-Werner Hammer, Lucas Platter
Summary: The research team calculated the rate of the rare decay Be-11 into Be-10 + p + e(-) + (nu) over bar (e) using Halo effective field theory to describe beta-delayed proton emission. They assumed a resonance in the Be-10-p system consistent with a recent experiment, obtaining a branching ratio and predicting a resonance width. The experimental results and resonance parameters were found to be consistent, and it was demonstrated that no exotic mechanisms are needed to explain the experimental decay rate.
Article
Physics, Multidisciplinary
Daniel Odell, Manuel Pavon Valderrama, Lucas Platter
Summary: Effective field theories require regularization and renormalization to make accurate predictions. Although regularization is not essential for the observable predictions of EFTs, the details of regulatory dependence can provide insights into the inner workings of an EFT. By quantitatively comparing the inferred residual cutoff dependence from different regulators, we demonstrate that cutoff variations provide limited information about uncertainties and power counting (at least in practical settings).
Article
Physics, Nuclear
Chinmay Mishra, A. Ekstrom, G. Hagen, T. Papenbrock, L. Platter
Summary: This study investigates the effects of different potentials on nucleon-nucleon interactions, revealing a surprisingly low breakdown momentum and demonstrating how accuracy and renormalization group invariance of phase shifts can be improved by adding contact terms.
Article
Physics, Nuclear
Zichao Yang, Emanuele Mereghetti, Lucas Platter, Matthias R. Schindler, Jared Vanasse
Summary: The electric dipole moments (EDMs) of three-nucleon systems are calculated in pionless effective field theory. Both one-body contributions from permanent proton and neutron EDMs and two-body contributions from charge-parity-odd nucleon-nucleon interactions are considered. The momentum dependence of the electric dipole form factor in the Wigner limit is found to be similar to the charge form factor, indicating proper renormalization.
Article
Optics
Daniel Odell, Arnoldas Deltuva, Lucas Platter
Summary: In this study, the potential use of a pure van der Waals potential as a starting point for an effective field theory to describe three-body processes in ultracold atomic systems is evaluated using a system of three He-4 atoms. The results demonstrate that the approach is effective and shows good agreement with realistic potential results. Additionally, it is shown that no three-body force is required at leading order in this effective field theory approach, and a universal correlation between three-body observables exists in the absence of an Efimov three-body parameter under universal van der Walls physics.
Article
Optics
Marcel Schmidt, H-W Hammer, L. Platter
Article
Physics, Nuclear
Hilla De-Leon, Lucas Platter, Doron Gazit
Article
Physics, Nuclear
D. Odell, A. Deltuva, J. Bonilla, L. Platter
Article
Physics, Nuclear
Bijaya Acharya, Lucas Platter, Gautam Rupak
Article
Physics, Nuclear
M. Schmidt, L. Platter, H-W Hammer
Article
Physics, Nuclear
Bijaya Acharya, Andreas Ekstrom, Lucas Platter
Article
Optics
Samuel B. Emmons, Daekyoung Kang, Bijaya Acharya, Lucas Platter