Journal
PHYSICAL REVIEW LETTERS
Volume 128, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.200402
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Funding
- NSF Center for Integrated Quantum Materials (CIQM) [DMR-1231319]
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A potential for propagation of a wave in two dimensions is created by randomly superposing plane waves, resulting in a sharp Bragg diffraction pattern similar to powder diffraction. Contrary to expectations, the lack of periodic structure does not prevent the observation of this phenomenon. The scattering in a chaotic cavity is partially resonant and does not follow Fermi's golden rule.
A potential for propagation of a wave in two dimensions is constructed from a random superposition of plane waves around all propagation angles. Surprisingly, despite the lack of periodic structure, sharp Bragg diffraction of the wave is observed, analogous to a powder diffraction pattern. The scattering is partially resonant, so Fermi???s golden rule does not apply. This phenomenon would be experimentally observable by sending an atomic beam into a chaotic cavity populated by a single mode laser.
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