2011/06/04 by G. T. Noe, G. Timothy Noe, H. J. Haugan +7 · 4 citations
Engineering · Physics and Astronomy · #Advanced Semiconductor Detectors and Materials #Condensed matter physics #Dynamics (music) #Materials science #Period (music) #Phonon #Physics #Semiconductor Quantum Structures and Devices #Superlattice #Terahertz technology and applications #cond-mat.mtrl-sci
paper · pdf · doi:10.1016/j.spmi.2012.08.010
published in Superlattices and Microstructures 52(6), 1071-1077 (Elsevier BV) · 6 pages, 4 figures
arxiv created 2011/06/04 · openalex publication_date 2012/08/27 · arxiv updated 2012/11/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We have performed ultrafast pump-probe spectroscopy studies on a series of InAs/GaSb-based short-period superlattice (SL) samples with periods ranging from 46 Åto 71 Å. We observe two types of oscillations in the differential reflectivity with fast (∼ 1- 2 ps) and slow (∼ 24 ps) periods. The period of the fast oscillations changes with the SL period and can be explained as coherent acoustic phonons generated from carriers photoexcited within the SL. This mode provides an accurate method for determining the SL period and assessing interface quality. The period of the slow mode depends on the wavelength of the probe pulse and can be understood as a propagating coherent phonon wavepacket modulating the reflectivity of the probe pulse as it travels from the surface into the sample.