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Atoms, Volume 12, Issue 9

2024 September - 4 articles

Cover Story: Determining cause-and-effect within wave–wave coupling helps us to further understand number, momentum, or energy transport. To explain our look-up table of the parent and daughter modes, we analyzed lab plasma fluctuation data where the velocity-shear-driven (IEDD) waves exhibited much stronger wave–wave coupling to the lower-frequency drift waves, with nearly 100% coherency, compared to the case of the related, single-eigenmode, current-driven (CDEIC) waves. In the figures, both high- and low-frequency pairs of the spectral components for the real part of the IEDD–drift bispectrum exhibited negative peaks that were separated by 3 kHz. No such signature appeared in the CDEIC–drift case. These findings imply that coupling is facilitated by broadband IEDD waves. In contrast, the background turbulence is characterized by random, noncoherent interactions. View this paper
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Articles (4)

  • Article
  • Open Access
1 Citations
1,345 Views
11 Pages

11 September 2024

Using a high-precision code, we generate the eigenstates of a PT-symmetric Hamiltonian. We solve the time-dependent Schrödinger equation (TDSE) of the non-Hermitian system based on the eigenset. Since the formulation is relatively new and the ob...

  • Article
  • Open Access
1,154 Views
14 Pages

5 September 2024

Turbulence implies nonlinear wave–wave coupling, and determining cause and effect of either is important to understand mixing responsible for enhanced number, momentum, or energy (NME) transport. To explain the identification of parent and daug...

  • Article
  • Open Access
3 Citations
1,490 Views
13 Pages

28 August 2024

We propose a new expression of the cooperative decay rate of a one-dimensional chain of N two-level atoms in the single-excitation configuration. From it, the interference nature of superradiance and subradiance arises naturally, without the need to...

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Atoms - ISSN 2218-2004