Propagating Coherent Acoustic Phonon Wavepackets in InMnAs/GaSb

Abstract

We observe pronounced oscillations in the differential reflectivity of a ferromagnetic InMnAs/GaSb heterostructure using two-color pump-probe spectroscopy. Although originally thought to be associated with the ferromagnetism, our studies show that the oscillations instead result from changes in the position and frequency-dependent dielectric function due to the generation of coherent acoustic phonons in the ferromagnetic InMnAs layer and their subsequent propagation into the GaSb. Our theory accurately predicts the experimentally measured oscillation period and decay time as a function of probe wavelength.

arXiv comment4 pages, 4 figures

References in corpus (6)

• Spintronics: Fundamentals and applications
• Gate-induced band ferromagnetism in an organic polymer
• Electronic States and Cyclotron Resonance in n-type InMnAs
• Theory of coherent acoustic phonons in InGaN/GaN multi-quantum wells
• Ultrahigh field electron cyclotron resonance absorption in In${}_{1-x}$Mn${}_x$As films
• Ultrahigh-Field Hole Cyclotron Resonance Absorption in InMnAs Films

Cited by in corpus (13)

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• Ultrafast Enhancement of Ferromagnetism via Photoexcited Holes in GaMnAs
• Effect of picosecond strain pulses on thin layers of the ferromagnetic semiconductor (Ga,Mn)(As,P)
• Near-bandgap wavelength-dependent studies of long-lived traveling coherent longitudinal acoustic phonon oscillations in GaSb/GaAs systems
• Femtosecond Demagnetization and Hot Hole Relaxation in Ferromagnetic GaMnAs
• Ultrafast Probes of Nonequilibrium Hole Spin Relaxation in Ferromagnetic Semiconductor GaMnAs
• Theory of carrier dynamics and time resolved reflectivity in InMnAs/GaSb heterostructures
• Slow Dephasing of Coherent Optical Phonons in Two-dimensional Lead Organic Chalcogenides
• Carrier dynamics and coherent acoustic phonons in nitride heterostructures
• Coherent optical and acoustic phonons generated at lattice-matched GaP/Si(001) heterointerfaces
• Energy dependent amplitude of Brillouin oscillations in GaP
• Acoustic Localization Phenomena in Ferroelectric Nanophononic Devices
• Coherent Phonon Dynamics in Short-Period InAs/GaSb Superlattices