Asier Piñeiro Orioli
University of Colorado Boulder
Time evolutionPauli exclusion principleRydberg atomDispersion (water waves)Phase (waves)PhysicsStatistical physicsSpacetimeClassification schemeDissipationQuasiparticleDimension (vector space)IonPhase spaceQuantum simulatorCritical exponentAttractorScaling dimensionLinear independenceExcited stateAtomUniversality (dynamical systems)Atomic physicsDistribution functionScalar field theoryCondensationQubitRadioactive decayBose gasThermalDegrees of freedom (physics and chemistry)Thermal quantum field theoryQuark–gluon plasmaInitial value problemMany-body problemBlocking (radio)ExponentPopulationTime correlationFrequency dependenceTheoretical physicsConservation lawQuantum statistical mechanicsScalar (mathematics)Fixed pointQuantum mechanicsDynamics (mechanics)Convergence (routing)Degenerate energy levelsClassical mechanicsNon-equilibrium thermodynamicsBosonSpin-½QuantumFermi gasAutocatalytic reactionDissipative systemScaling
10Publications
6H-index
157Citations
Publications 10
Newest
#1Thomas BilitewskiH-Index: 8
Last. Ana Maria Rey (NIST: National Institute of Standards and Technology)H-Index: 62
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The observation of Pauli blocking of atomic spontaneous decay via direct measurements of the atomic population requires the use of long-lived atomic gases where quantum statistics, atom recoil and cooperative radiative processes are all relevant. We develop a theoretical framework capable of simultaneously accounting for all these effects in a regime where prior theoretical approaches based on semi-classical non-interacting or interacting frozen atom approximations fail. We apply it to atoms in ...
Many-body quantum systems far from equilibrium can exhibit universal scaling dynamics which defy standard classification schemes. Here, we disentangle the dominant excitations in the universal dynamics of highly-occupied Ncomponent scalar systems using unequal-time correlators. While previous equal-time studies have conjectured the infrared properties to be universal for all N we clearly identify for the first time two fundamentally different phenomena relevant at different N We find al...
6 CitationsSource
#1Isara ChantesanaH-Index: 1
Last. Thomas GasenzerH-Index: 28
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We outline a kinetic theory of non-thermal fixed points for the example of a dilute Bose gas, partially reviewing results obtained earlier, thereby extending, complementing, generalizing and straightening them out. We study universal dynamics after a cooling quench, focusing on situations where the time evolution represents a pure rescaling of spatial correlations, with time defining the scale parameter. The non-equilibrium initial condition set by the quench induces a redistribution of particle...
26 CitationsSource
#1Asier Piñeiro Orioli (CU: University of Colorado Boulder)H-Index: 6
#2Jürgen Berges (Heidelberg University)H-Index: 29
Universal phenomena far from equilibrium exhibit additional independent scaling exponents and functions as compared to thermal universal behavior. For the example of an ultracold Bose gas we simulate nonequilibrium transport processes in a universal scaling regime and show how they lead to the breaking of the fluctuation-dissipation relation. As a consequence, the scaling of spectral functions (commutators) and statistical correlations (anti-commutators) between different points in time and spac...
21 CitationsSource
#1Asier Piñeiro Orioli (Heidelberg University)H-Index: 6
Last. Ana Maria ReyH-Index: 62
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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 spac...
38 CitationsSource
#1Andreas Schachner (Heidelberg University)H-Index: 3
Last. Jürgen BergesH-Index: 29
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We explore the far-from-equilibrium dynamics of Bose gases in a universal regime associated to nonthermal fixed points. While previous investigations concentrated on scaling functions and exponents describing equal-time correlations, we compute the additional scaling functions and dynamic exponent zcharacterizing the frequency dependence or dispersion from unequal-time correlations. This allows us to compare the characteristic condensation and correlation times from a finite-size scaling anal...
15 CitationsSource
#3Jürgen Berges (Heidelberg University)H-Index: 29
We investigate universal behavior of isolated many-body systems far from equilibrium, which is relevant for a wide range of applications from ultracold quantum gases to high-energy particle physics. The universality is based on the existence of nonthermal fixed points, which represent nonequilibrium attractor solutions with self-similar scaling behavior. The corresponding dynamic universality classes turn out to be remarkably large, encompassing both relativistic as well as nonrelativistic quant...
70 CitationsSource