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Magneto-Optical Probe of Coherent Phenomena in Multi-Functional Materials

Date : Tuesday, January 8th, 2019 2:00 pm 〜 Place : Seminar Room 2 (A612), 6th Floor, ISSP Lecturer : Prof. Giti Khodaparast Affiliation : Physics Department, Virginia Tech (USA) Committee Chair : MATSUDA Yasuhiro (65329)
e-mail: ymatsuda@issp.u-tokyo.ac.jp

Intense laser pulses can generate carriers, spins, phonons, and magnons far from equilibrium states. Information about the dynamical behavior of these nonequilibrium states can be elucidated by: 1) the electronic structure, 2) carrier scattering and relaxation mechanisms, including carrier-phonon and carrier-carrier scattering, 3) spin and magnetization dynamics, and 4) dynamical many-body interactions. For example, coherent acoustic phonons which are ultrasonic strain pulses can result in a broad optical spectrum from GHz up to THz1,2,3,4  The possibility of manipulating Coherent Phonons (CP) could lead to develop new techniques such acoustic imaging as well as better understanding and control of electronic and optical properties in devices. Exploring the interaction of CP with carriers, magnetic impurities, and photons can open new prospective of phononics on nanoscale. For example, the manipulation of spins in semiconductors without the application of magnetic fields opens the door to the next generation of devices, where the electronic computation and magnetic memory can be performed on the same chip. In this talk, I will present several magneto-optical studies including CP generation and control in multifunctional materials such as ferromagnetic semiconductors and mutliferroics 1,5.

1  B. A. Magill, K-D Park, Y. Zhou, A. Chopra, Maurya, S. Priya, M. B. Raschke, A. Belyanin, C. J. Stanton, G. A. Khodaparast ,“Ultrafast Anisotropic Optical Response and Coherent Acoustic Phonon Generation in Polycrystalline BaTiO3-BiFeO3”, Energy Harvesting and Systems. Volume 3, Issue 3, 229, April (2016).

2  M. P. Hasselbeck, D. Stalnaker, L. Schlie, A. Stintz, and T. J. Rotter, “Fress space radiation of coherent, coupled plasmon-phonon modes from InAs,” Physica B 314, 158 (2002).

3  M. P. Hasselbeck, D. Stalnaker, L. Schlie, A. Stintz, T. J. Rotter, and M. Sheik-Bahae, “Emission of terahertz radiation from coupled plasmon-phonon modes in InAs,” Phys. Rev. B 65, 233203 (2002).

4  C. K. Sun, J. C. Liang, C. J. Stanton, A. Abare, L. Coldren, and S. P. DenBars, “Large coherent acoustic-phonon oscillation observed in InGaN/GaN multiple-quantum wells,” Appl. Phys. Lett. 75, 1249 (1999).

5  B. Madon, H. Byul Kang, M. Gyu Kang, D. Maurya, B. Magill, M. Alves, J.-E. Wegrowe, H.-J. Drouhin, S. Priya, and G. A. khodaparast, “Room Temperature Ferromagnetic Resonance in Hetero-Epitaxial BTO-BFO/LSMO Magnetoelectric Composite”, AIP Advances 8 (10), 105034 (2018). Editor’s Pick.


(Published on: Wednesday December 12th, 2018)