Seminarium MTPR - Resonant effects for efficient generation of high-frequency phonons and magnons

will speak about: "Resonant effects for efficient generation of high-frequency phonons and magnons"

Date, time: January 28 at 13:00 in the Prof. Arkadiusz Piekara Auditorium, Collegium Physicum.

Those who cannot participate in person can follow the talk using Microsoft Teams:
Dr Michal Kobecki - Resonant effects for efficient generation of high-frequency phonons and magnons | Meeting-Join | Microsoft Teams

Abstract: Phonons and magnons play a significant role in material science and solid-state physics. Their small wavelengths make them compatible with quantum nano-devices, and their frequencies can surpass modern computation speeds. This potential makes them useful for qubits, quantum memories, hybrid systems, and elements in quantum computing networks. In this work we focus on using a novel experimental method based on the optical periodic pumpprobe excitation and detection of magnons and phonons in the time domain. Presented studies include resonant excitation of magnons in GeFe [1], bismuth iron garnet [2], and CrSBr. Phonon studies focus on exploiting various resonant mechanisms to increase the efficiency of excitation and detection in systems like metallic thin films [3], III-V [4], and II-VI semiconductor nanostructures. Currently running research projects include efforts exploiting open optical cavity and lateral structuring for the efficient excitation and propagation of phonons in nanostructures. Over the years, applying the repetition rate of optical excitation matching the resonant frequency of collective excitations led to interesting results, conclusions, and plans, which I would like to share.

References: 
[1] M. Kobecki, A. V. Scherbakov, T. L. Linnik, S. M. Kukhtaruk, V. E. Gusev, D. P. Pattnaik, I. A. Akimov, A. W. Rushforth, A. V. Akimov, and M. Bayer, Resonant thermal energy transfer to magnons in a ferromagnetic nanolayer, Nat. Commun. 11, 4130 (2020).
[2] A. E. Khramova, M. Kobecki, I. A. Akimov, I. V. Savochkin, M. A. Kozhaev, A. N. Shaposhnikov, V. N. Berzhansky, A. K. Zvezdin, M. Bayer, and V. I. Belotelov, Accumulation and control of spin waves in magnonic dielectric microresonators by a comb of ultrashort laser pulses, Sci. Rep. 12, 7369 (2022).
[3] M. Kobecki et al., Picosecond ultrasonics with miniaturized semiconductor lasers, Ultrasonics 106, 106150 (2020).
[4] M. Kobecki, A. V. Scherbakov, S. M. Kukhtaruk, D. D. Yaremkevich, T. Henksmeier, A. Trapp, D. Reuter, V. E. Gusev, A. V. Akimov, and M. Bayer, Giant Photoelasticity of Polaritons for Detection of Coherent Phonons in a Superlattice with Quantum Sensitivity, Phys. Rev. Lett. 128, 157401 (2022).

Chairman: B. Graczykowski

Additional Information: All are invited to Coffee with the Speaker, starting at 12:30 in front of the auditorium. Please follow the news on the MTPR website (http://mtpr.amu.edu.pl), where information about upcoming events will be available soon.