Bulletin of the American Physical Society
89th Annual Meeting of the Southeastern Section of the APS
Volume 67, Number 18
Thursday–Saturday, November 3–5, 2022; University of Mississippi, University, MS
Session N04: Optics and Photonics
8:30 AM–10:18 AM,
Saturday, November 5, 2022
University of Mississippi Room: Ballroom D
Chair: Nihar Pradhan
Abstract: N04.00001 : Time-Resolved Spectroscopy of Multifunctional Materials*
8:30 AM–9:00 AM
Brenden A Magill
Brenden A Magill
Nicholas W Smith
(Florida State University)
Stephan A Mcgill
Rathsara R Mudiyanselage
Christopher J Stanton
(University of Florida)
(University of Minnesota)
Giti A Khodaparast
(CPs) on a nanoscale length and picosecond time scale promises to be crucial in the fields of quantum
phononics. In this talk, we focus on magneto-optical measurements at high magnetic fields of two multifunction material systems for developing concepts for new device functionalities: Multiferroic BaTiO3-BiFeO3 films and nanorods, and GaMnAs, a ferromagnetic semiconductor.
BaTiO3-BiFeO3 is a multiferroic material with strong magneto-electric (ME) properties. Specifically, by detecting coherent phonons (CP) we provided detailed spectroscopy information on coherent states in this material system. Our results provide new insights into the ME signatures in these heterostructures.
Additionally, we present our experimental and theoretical studies on the generation and propagation of longitudinal coherent acoustic phonons by ultrafast laser pulses in a ferromagnetic GaMnAs film at high external magnetic fields. Our observation provides new information, reporting an extremely large increase in the amplitude of the CP when an external magnetic field is applied. The ability to control and manipulate coherent vibrational degrees of freedom on a nanoscale length and picosecond time scale promises to be revolutionary in the fields of quantum phononics.
*This material is based upon work supported by the Air Force Office of Scientific Research under award number FA9550-17-1-0341 and DURIP funding (FA9550-16-1-0358). A portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by the National Science Foundation Cooperative Agreement No. DMR-1644779 and the State of Florida.
The American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics.
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