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Suppressing deleterious effects of spontaneous emission in creating bound states in cold atom continuum
- Publication Year :
- 2019
- Publisher :
- arXiv, 2019.
-
Abstract
- In a previous paper [B. Deb and G. S. Agarwal, Phys. Rev. A 90, 063417 (2014)], it was theoretically shown that, magneto-optical manipulation of low energy scattering resonances and atom-molecule transitions could lead to the formation of a bound state in continuum (BIC), provided there is no spontaneous emission. We find that even an exceedingly small spontaneous decay from exited molecular states can spoil the BIC. In this paper, we show how to circumvent the detrimental effect of spontaneous emission by making use of vacuum-induced coherence (VIC) which results in the cancellation or suppression of spontaneous emission. VIC occurs due to the destructive interference between two spontaneous decay pathways. An essential condition for VIC is the non-orthogonality of the transition dipole moments associated with the decays. Furthermore, the interference between decay pathways requires that the spacing between the two decaying states must be comparable to or smaller than the square root of the product of the two spontaneous linewidths. We demonstrate that these conditions can be fulfilled by microwave dressing of two appropriately chosen molecular excited states, opening a promising prospect for the experimental realization of BIC of cold atoms.<br />Comment: 15 pages, 5 figures
- Subjects :
- Physics
Quantum Physics
Scattering
FOS: Physical sciences
02 engineering and technology
021001 nanoscience & nanotechnology
Condensed Matter Physics
Interference (wave propagation)
01 natural sciences
Molecular physics
Atomic and Molecular Physics, and Optics
Dipole
Ultracold atom
Excited state
0103 physical sciences
Bound state
Spontaneous emission
010306 general physics
0210 nano-technology
Feshbach resonance
Quantum Physics (quant-ph)
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....ca4da90763a41fd5ad85b722838a39e9
- Full Text :
- https://doi.org/10.48550/arxiv.1903.02355