Observation of Surface-Avoiding Waves: A New Class of Extended States in Periodic Media

Details Observation of Surface-Avoiding Waves: A New Class of Extended States in Periodic Media Observation of Surface-Avoiding Waves: A New Class of Extended States in Periodic Media

2006-07-13

arxiv.org/abs/cond-mat/0607341v1

Physics

Condensed Matter

Materials Science

16 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.97.124301

Coherent time-domain optical experiments on GaAs-AlAs superlattices reveal the exis-tence of an unusually long-lived acoustic mode at ~ 0.6 THz, which couples weakly to the environment by evading the sample boundaries. Classical as well as quantum states that steer clear of surfaces are generally shown to occur in the spectrum of periodic struc-tures, for most boundary conditions. These surface-avoiding waves are associated with frequencies outside forbidden gaps and wavevectors in the vicinity of the center and edge of the Brillouin zone. Possible consequences for surface science and resonant cavity ap-plications are discussed.

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