title: Observation of standing waves of electron-hole sound in a photoexcited semiconductor.
abstract: Three-dimensional multicomponent plasmas composed of species with very different masses support a new branch of charge-density fluctuations known as acoustic plasmons. Here, we report on an ultrafast optical method to generate and probe coherent states of acoustic plasmons in a slab of GaAs, which relies on strong photoexcitation to create a large population of light electrons and heavy holes. Consistent with the random-phase-approximation theory, the data reveal standing plasma waves confined to these slabs, similar to those of conventional sound but with associated velocities that are significantly larger.
authors: Center for Photonics and Multiscale Nanomaterials, University of Michigan, Ann Arbor, Michigan 48109, USA and Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA.
authors: P
authors: P
authors: Padmanabhan
authors: Center for Photonics and Multiscale Nanomaterials, University of Michigan, Ann Arbor, Michigan 48109, USA and Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA.
authors: S M
authors: SM
authors: Young
authors: Center for Photonics and Multiscale Nanomaterials, University of Michigan, Ann Arbor, Michigan 48109, USA and Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA.
authors: M
authors: M
authors: Henstridge
authors: Center for Photonics and Multiscale Nanomaterials, University of Michigan, Ann Arbor, Michigan 48109, USA and Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109-2122, USA.
authors: S
authors: S
authors: Bhowmick
authors: Center for Photonics and Multiscale Nanomaterials, University of Michigan, Ann Arbor, Michigan 48109, USA and Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109-2122, USA.
authors: P K
authors: PK
authors: Bhattacharya
authors: Center for Photonics and Multiscale Nanomaterials, University of Michigan, Ann Arbor, Michigan 48109, USA and Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA.
authors: R
authors: R
authors: Merlin