Derek A. Bas
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Exploring Weak Turbulence of Phonon and Magnon Beams in Magneto-Acoustic Ultrathin Films Open
This study presents a simple theoretical model describing narrow envelope surface acoustic waves (phonons) and spin waves (magnons) in an ultrathin ferromagnetic film. Based on the general principles of weak wave turbulence, the model cons…
View article: Imaging Nonlinear Spin Waves in Magnetoacoustic Devices
Imaging Nonlinear Spin Waves in Magnetoacoustic Devices Open
Magnetoacoustic systems offer promising platforms for next-generation sensors and computing applications, but understanding their nonlinear dynamics remains challenging. Here, we use nitrogen vacancy (NV) centers in diamond to spatially ma…
Symmetry and Nonlinearity of Spin Wave Resonance Excited by Focused Surface Acoustic Waves Open
The use of a complex ferromagnetic system to manipulate GHz surface acoustic waves (SAWs) is a rich current topic under investigation, but the high‐power nonlinear regime is under‐explored. Focused SAWs are introduced, which provide a way …
Symmetry and nonlinearity of spin wave resonance excited by focused surface acoustic waves Open
The use of a complex ferromagnetic system to manipulate GHz surface acoustic waves is a rich current topic under investigation, but the high-power nonlinear regime is under-explored. We introduce focused surface acoustic waves, which provi…
Engineering transient hyperbolic metamaterials using InAsSb-based semiconductor Open
The authors demonstrate the ability to create an ultrafast hyperbolic momentum state using metallic InAsSb alloys embedded within dielectric GaSb and explore the possibility of transient modification of metamaterials to control the optical…
Adaptation of Fluctuating Magnetoacoustic System to External Signals Open
Article studying the influence of microwave signals of different shapes on the magnetoacoustic wave system with a giant nonlinearity in canted antiferromagnet FeBO₃ at room temperature, which is close to its phase transition to the paramag…
Giant nonreciprocity of surface acoustic waves enabled by the magnetoelastic interaction Open
Giant nonreciprocity in a SAW-based microwave isolator device is reported offering substantial size and performance advantages.
Bright and Ultrafast Photoelectron Emission from Aligned Single-Wall Carbon Nanotubes through Multiphoton Exciton Resonance Open
Ultrashort bunches of electrons,\nemitted from solid surfaces through\nexcitation by ultrashort laser pulses, are an essential ingredient\nin advanced X-ray sources, and ultrafast electron diffraction and\nspectroscopy. Multiphoton photoem…
View article: Identification of photocurrents in topological insulators
Identification of photocurrents in topological insulators Open
Optical injection and detection of charge currents is an alternative to conventional transport and photoemission measurements, avoiding the necessity of invasive contact that may disturb the system being examined. This is a particular conc…
View article: Photocurrents in Bi2Se3: bulk versus surface, and injection versus shift currents
Photocurrents in Bi2Se3: bulk versus surface, and injection versus shift currents Open
Optical injection and detection of charge currents can complement conventional transport and photoemission measurements without the necessity of invasive contact that may disturb the system being examined. This is a particular concern for …
Optical and Terahertz Measurements of Spintronic Materials Open
Terahertz time-domain spectroscopy (THz-TDS) is a versatile method to determine lattice, electronic charge and spin dynamics. This dissertation employs THz-TDS to study the spin and charge dynamics in topological insulator and antiferromag…