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Nakata, Koki; Takayoshi, Shintaro*
Physical Review B, 102(9), p.094417_1 - 094417_11, 2020/09
Times Cited Count：9 Percentile：53.43(Materials Science, Multidisciplinary)Combining the technologies of quantum optics and magnonics [A. Rebei and J. Hohlfeld, Phys. Lett. A 372, 1915 (2008); J. Appl. Phys. 103, 07B118 (2008)] [S. Takayoshi et al., Phys. Rev. B 90, 214413 (2014); S. Takayoshi et al., Phys. Rev. B 90, 085150 (2014)], we find that the circularly polarized laser can dynamically realize the quasiequilibrium magnon Bose-Einstein condensates in insulating ferrimagnets. This provides an access to coherent magnons in the high frequency regime of the order of terahertz.
Nakata, Koki; Kim, S. K.*; Takayoshi, Shintaro*
Physical Review B, 100(1), p.014421_1 - 014421_9, 2019/07
Times Cited Count：10 Percentile：49.82(Materials Science, Multidisciplinary)We study the laser control of magnon topological phases induced by the Aharonov-Casher effect in insulating antiferromagnets (AFs). Using Floquet formalism, we study nonequilibrium magnon dynamics away from the adiabatic limit and its effect on topological phenomena. Our results provide a handle to control and design magnon topological properties in the insulating AF, and thus open a new door to "photonic magnonics".
Nakata, Koki; Kim, S. K.*; Takayoshi, Shintaro*
no journal, ,
We study the laser control of magnon topological phases induced by the Aharonov-Casher effect in insulating antiferromagnets (AFs). Our results provide a handle to control and design magnon topological properties in the insulating AF.
Nakata, Koki; Kim, S. K.*; Takayoshi, Shintaro*
no journal, ,
We study the laser control of magnon topological phases induced by the Aharonov-Casher effect in insulating antiferromagnets (AFs). Since the laser electric field can be considered as a time-periodic perturbation, we apply the Floquet theory and perform the inverse frequency expansion by focusing on the high frequency region. Using the obtained effective Floquet Hamiltonian, we study nonequilibrium magnon dynamics away from the adiabatic limit and its effect on topological phenomena. This work enables us to control and design magnonic topological properties away from equilibrium.
