Motional effects in dynamics of fluorescence of cold atomic ensembles excited by resonance pulse radiation

• URL: http://arxiv.org/abs/2304.14968v1
• Date: Fri, 28 Apr 2023 16:43:45 GMT
• Title: Motional effects in dynamics of fluorescence of cold atomic ensembles excited by resonance pulse radiation
• Authors: A. S. Kuraptsev and I. M. Sokolov
• Abstract summary: We show that even for sub-Doppler temperatures, the motion of atoms can significantly affect the nature of both superradiation and subradiation. It is shown that the change in the lifetime of the given adiabatic term of the diatomic quasi-molecule induced by the change in the interatomic distance can lead not to the anticipated weakening of subradiation effect but to its enhancement.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We report the investigation of the influence of atomic motion on the fluorescence dynamics of dilute atomic ensemble driven by resonant pulse radiation. We show that even for sub-Doppler temperatures, the motion of atoms can significantly affect the nature of both superradiation and subradiation. We also demonstrate that, in the case of an ensemble of moving scatterers, it is possible to observe the nonmonotonic time dependence of the fluorescence rate. This leads to the fact that, in certain time intervals, increasing in temperature causes not an decrease but increase of the fluorescence intensity in the cone of coherent scattering. We have analyzed the role of the frequency diffusion of secondary radiation as a result of multiple light scattering in an optically dense medium. It is shown that spectrum broadening is the main factor which determines radiation trapping upon resonant excitation. At later time, after the trapping stage, the dynamics is dominated by close pairs of atoms (dimers). The dynamics of the excited states of these dimers has been studied in detail. It is shown that the change in the lifetime of the given adiabatic term of the diatomic quasi-molecule induced by the change in the interatomic distance as well as possible non-adiabatic transitions between sub- and superradiant states caused by atomic motion can lead not to the anticipated weakening of subradiation effect but to its enhancement.

Related papers

• Breakdown of steady-state superradiance in extended driven atomic arrays [0.0]
  We show how light-shifts and decay rates induced by dipole-dipole interactions modify the steady-state properties of coherently driven arrays of quantum emitters. We find that diverging from the well-established Dicke paradigm of equal all-to-all interactions significantly modifies the emission properties.
  arXiv  Detail & Related papers  (2023-11-17T19:04:14Z)
• Super- and subradiance in dilute disordered cold atomic samples: observations and interpretations [0.0]
  We study in detail the temporal dynamics of the decay of the scattered light after switching off the driving laser. We refer to this behavior as superradiance and subradiance, respectively.
  arXiv  Detail & Related papers  (2023-06-05T14:00:21Z)
• Dynamics of molecular rotors in bulk superfluid helium [68.8204255655161]
  We report on the experimental study of the laser-induced rotation of helium dimers inside the superfluid $4mathrmHe$ bath at variable temperature. The observed temperature dependence suggests a non-equilibrium evolution of the quantum bath, accompanied by the emission of the wave of second sound.
  arXiv  Detail & Related papers  (2023-04-08T01:22:19Z)
• Dynamics of Transmon Ionization [94.70553167084388]
  We numerically explore the dynamics of a driven transmon-resonator system under strong and nearly resonant measurement drives. We find clear signatures of transmon ionization where the qubit escapes out of its cosine potential.
  arXiv  Detail & Related papers  (2022-03-21T18:00:15Z)
• Diffraction of strongly interacting molecular Bose-Einstein condensate from standing wave light pulses [3.7650630333237194]
  We study the effects of strong inter-particle interaction on diffraction of a Bose-Einstein condensate of $6Li$ molecules created by pulses of a standing wave. For short pulses we observe the standard Kapitza-Dirac diffraction, with the contrast of the diffraction pattern strongly reduced for very large interactions. For longer pulses diffraction shows the characteristic for matter waves impinging on an array of tubes and coherent channeling transport.
  arXiv  Detail & Related papers  (2022-01-05T14:01:08Z)
• Double-twisted spectroscopy with delocalized atoms [0.0]
  In almost all studies of light-atom interaction, the atom is viewed as a localized probe of the twisted light field. This paper argues that conceptually novel effects will arise if light-atom interaction is studied in the double-twisted regime with delocalized atoms.
  arXiv  Detail & Related papers  (2021-08-13T03:40:43Z)
• Subradiance in dilute atomic ensembles: Role of pairs and multiple scattering [0.0]
  We study the slow (subradiant) decay of the fluorescence of motionless atoms after a weak pulsed excitation. We show that, in the linear-optics regime, the slow decay rate can be dominated by close pairs of atoms forming superradiant and subradiant states. For a large-enough resonant optical depth and at later time, the dynamics is dominated by collective many-body effects.
  arXiv  Detail & Related papers  (2020-12-19T11:10:04Z)
• Collective spontaneous emission of two entangled atoms near an oscillating mirror [50.591267188664666]
  We consider the cooperative spontaneous emission of a system of two identical atoms, interacting with the electromagnetic field in the vacuum state. Using time-dependent theory, we investigate the spectrum of the radiation emitted by the two-atom system. We show that it is modulated in time, and that the presence of the oscillating mirror can enhance or inhibit the decay rate.
  arXiv  Detail & Related papers  (2020-10-07T06:48:20Z)
• Maximum refractive index of an atomic medium [58.720142291102135]
  All optical materials with a positive refractive index have a value of index that is of order unity. Despite the giant response of an isolated atom, we find that the maximum index does not indefinitely grow with increasing density. We propose an explanation based upon strong-disorder renormalization group theory.
  arXiv  Detail & Related papers  (2020-06-02T14:57:36Z)
• Optically pumped spin polarization as a probe of many-body thermalization [50.591267188664666]
  We study the spin diffusion dynamics of 13C in diamond, which we dynamically polarize at room temperature via optical spin pumping of engineered color centers. We find good thermal contact throughout the nuclear spin bath, virtually independent of the hyperfine coupling strength. Our results open intriguing opportunities to study the onset of thermalization in a system by controlling the internal interactions within the bath.
  arXiv  Detail & Related papers  (2020-05-01T23:16:33Z)
• Nitrogen-vacancy defect emission spectra in the vicinity of an adjustable silver mirror [62.997667081978825]
  Optical emitters of quantum radiation in the solid state are important building blocks for emerging technologies. We experimentally study the emission spectrum of an ensemble of nitrogen-vacancy defects implanted around 8nm below the planar diamond surface.
  arXiv  Detail & Related papers  (2020-03-31T10:43:26Z)

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.