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14 February 2008 Direct observation of Landau damping with coherent plasmons in InSb
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Abstract
We study Landau damping of a coherent, solid-state plasma by means of ultrafast THz spectroscopy. The onset of this phenomenon occurs when momentum and energy conservation are satisfied for single-particle excitations; this diminishes collective mode behavior. A series of InSb-based bulk heterostructures have varying amounts of spatial confinement, allowing direct access to a different range of wave vectors in the electron-electron interaction. Sufficient confinement leads to disappearance of the plasmon quasi-particle via Landau (collisionless) damping. The experimental results are quantitatively reproduced by model calculations.
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D. Seletskiy, M. P. Hasselbeck, M. Sheik-Bahae, and L. R. Dawson "Direct observation of Landau damping with coherent plasmons in InSb", Proc. SPIE 6892, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XII, 68921S (14 February 2008); https://doi.org/10.1117/12.759159
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