Quantum effects in the cooperative scattering of light by atomic clouds

Pucci, Lorenzo; Roy, Analabha; Santo, T. S. do Espirito; Kaiser, Robin; Kastner, Michael; Bachelard, Romain

doi:10.1103/physreva.95.053625

Cited by 26 publications

(42 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An optically denser cloud, for example achieved by increasing the atom number, could actually allow us to investigate the effects of the dipole-dipole coupling on the cloud fluorescence, and in particular the emergence of new resonances. While few-atom physics requires subwavelength distances to correlate efficiently the dipole fluctuations [33][34][35], large dilute atomic clouds with a large optical thickness have recently been predicted to present an asymmetric Mollow triplet [20] as well as higher-order Mollow sidebands [21].…”

Section: Resultsmentioning

confidence: 99%

Mollow triplet in cold atoms

et al. 2019

Self Cite

View full text Add to dashboard Cite

In this paper, we measure the spectrum of light scattered by a cold atomic cloud driven by a strong laser beam. The experimental technique is based on heterodyne spectroscopy coupled to singlephoton detectors and intensity correlations. At resonance, we observe the Mollow triplet. This spectrum is quantitatively compared to the theoretical one, emphasizing the influence of the temperature of the cloud and the finite-size of the laser beam. Off resonance measurements are also done showing a very good agreement with theory.

show abstract

Section: Resultsmentioning

confidence: 99%

Mollow triplet in cold atoms

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…Simulations reproduce several collective dynamical phenomena that were recently observed in cold gas experiments, and we can understand the physics behind these effects with simple considerations. For larger systems and in higher dimensions, methods such as the discrete truncated Wigner approximation could be utilized [34][35][36]62]. Our formulation may also be useful for modeling other spin transport experiments [31,63].…”

Section: Short Time Dynamics Of An Xxz Hamiltonian [47] Is Given By ŝmentioning

confidence: 99%

“…Our predictions also suggest directions for future experiments in the arXiv:1601.01004v3 [cond-mat.quant-gas] 7 Dec 2016 2 weakly interacting regime, which might, for instance, investigate the collective rise of quantum correlations. In contrast to strongly coupled ultracold gases, where motion is quickly suppressed and features of the dynamics tend to be universal [2,31,32], in the weakly-interacting regime spin, motion, and interactions are all important and must be treated on the same level.A wide variety of analytical and numerical tools have been developed for lattice quantum spin models [33][34][35][36][37][38][39][40], making a spin model description of fermions potentially very useful. To demonstrate the capabilities of this approach, we use time-dependent matrix product state methods which are efficient in one-dimension [41].…”

mentioning

confidence: 99%

See 1 more Smart Citation

Dynamics of Interacting Fermions in Spin-Dependent Potentials

Koller¹,

Wall²,

Mundinger³

et al. 2016

Phys. Rev. Lett.

View full text Add to dashboard Cite

Recent experiments with dilute trapped Fermi gases observed that weak interactions can drastically modify spin transport dynamics and give rise to robust collective effects including global demagnetization, macroscopic spin waves, spin segregation, and spin self-rephasing. In this work we develop a framework for studying the dynamics of weakly interacting fermionic gases following a spin-dependent change of the trapping potential which illuminates the interplay between spin, motion, Fermi statistics, and interactions. The key idea is the projection of the state of the system onto a set of lattice spin models defined on the single-particle mode space. Collective phenomena, including the global spreading of quantum correlations in real space, arise as a consequence of the long-ranged character of the spin model couplings. This approach achieves good agreement with prior measurements and suggests a number of directions for future experiments.The interplay between spin and motional degrees of freedom in interacting electron systems has been a longstanding research topic in condensed matter physics. Interactions can modify the behavior of individual electrons and give rise to emergent collective phenomena such as superconductivity and colossal magnetoresistance [1]. Theoretical understanding of non-equilibrium dynamics in interacting fermionic matter is limited, however, and many open questions remain. Ultracold atomic Fermi gases, with precisely controllable parameters, offer an outstanding opportunity to investigate the emergence of collective behavior in out-of-equilibrium settings.Progress in this direction has been made in recent experiments with ultracold spin-1/2 fermionic vapors, where initially spin-polarized gases were subjected to a spin-dependent trapping potential ( Fig. 1) implemented by a magnetic field gradient [2-4], or a spin-dependent harmonic trapping frequency [5-8] -equivalent to a spatially-varying gradient. Even in the weakly interacting regime, drastic modifications of the single-particle dynamics were reported. Moreover, despite the local character of the interactions, collective phenomena were observed, including demagnetization and transverse spinwaves in the former, and a time-dependent separation (segregation) of the spin densities and spin self-rephasing in the latter. Although mean-field and kinetic theory formulations have explained some of these phenomena [8][9][10][11][12][13][14][15][16][17][18], a theory capable of describing all the time scales and the interplay between spin, motion, and interactions has not been developed.In this work, we develop a framework that accounts for the coupling of spin and motion in weakly interacting Fermi gases. We qualitatively reproduce and explain all phenomena of the aforementioned experiments and obtain quantitative agreement with the results of Ref. [7]. In this formulation the state of the system is represented as a superposition of spin configurations which live on lattices whose sites correspond to modes of the underlying single-particle sy...

show abstract

“…For this we study recently developed extensions of TWA [2,27], adapted to our spin-boson model, which allow one to add corrections order by order and hence estimate the error of the approximation. In this framework corrections are added by solving a truncated Bogoliubov-BornGreen-Kirkwood-Yvon (BBGKY) hierarchy of equations.…”

Section: Arxiv:170506203v1 [Cond-matquant-gas] 17 May 2017mentioning

confidence: 99%

Nonequilibrium dynamics of spin-boson models from phase-space methods

et al. 2017

View full text Add to dashboard Cite

An accurate description of the nonequilibrium dynamics of systems with coupled spin and bosonic degrees of freedom remains theoretically challenging, especially for large system sizes and in higher than one dimension. Phase space methods such as the Truncated Wigner Approximation (TWA) have the advantage of being easily scalable and applicable to arbitrary dimensions. In this work we adapt the TWA to generic spin-boson models by making use of recently developed algorithms for discrete phase spaces [1]. Furthermore we go beyond the standard TWA approximation by applying a scheme based on the Bogoliubov-Born-Green-Kirkwood-Yvon (BBGKY) hierarchy of equations [2] to our coupled spin-boson model. This allows in principle to study how systematically adding higher order corrections improves the convergence of the method. To test various levels of approximation we study an exactly solvable spin-boson model which is particularly relevant for trapped-ion arrays. Using TWA and its BBGKY extension we accurately reproduce the time evolution of a number of one-and two-point correlation functions in several dimensions and for arbitrary number of bosonic modes.

show abstract

Quantum effects in the cooperative scattering of light by atomic clouds

Cited by 26 publications

References 41 publications

Mollow triplet in cold atoms

Mollow triplet in cold atoms

Dynamics of Interacting Fermions in Spin-Dependent Potentials

Nonequilibrium dynamics of spin-boson models from phase-space methods

Contact Info

Product

Resources

About