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Date and time: 2nd May (Mon.) 16:00`
êŠ: SPring-8, –GŒõŠÙ
Place: SPring-8, "HOUKOUKAN" seminar room
Title: ESR and Nonlinear response of cavity-photon systems
u‰‰ŽÒ: ‹{‰º ¸“ñ Ž (“Œ‹ž‘åŠw—Šw•”•¨—)
Speaker: Prof. Seiji Miyashita (Department of Physics, University of Tokyo)
Abstract:

Responses to AC magnetic field, in particular, the spectroscopy of transmission and emission of a paramagnetic spin ensemble focusing on the cavity effect will be discussed. The spectrum has a line shape reflecting dense energy density of systems [1,2,3], and also the effect of dissipative environments[4]. The coupling between the material (hereafter we call it 'spin system') and the cavity modes has attracts interests. Effects of the cavity have been studied by the Jaynes-Cummings model. Recently, several experimental results have been reported [5,6,7]. In those cases, we have to consider how the cavity mode couple to the discrete energy levels of the spin system [8].

We will study the eigen-energy distribution of the multi-spin system (Tavis-Cummings model) which shows a peculiar structure with the number of cavity photons and the number of spins. We study how the line shape change reflecting this structure, and investigate the change from a double-peak structure to a single peak structure [9,10].

[1] R. Kubo, J. Phys. Soc. Jpn. 12, 570 (1957).
[2] S. Miyashita, T. Yoshino and A. Ogasahara, J. Phys. Soc. Jpn. 68, 655 (1999).
[3] S. El Shawish, O. Cepas, and S. Miyashita, Phys. Rev. B 81, 224421 (2010).
[4] C. Uchiyama, M. Aihara, M. Saeki and S. Miyashita, Phys. Rev. E, 80, 021128, (2009).
[5] I. Chiorescu, N. Groll, S. Bertaina, T. Mori, and S. Miyashita, Phys. Rev. B 82, 024413(2010).
[6] D. I. Schster, et al. Phys. Rev. Lett. 105 140501 (2010).
[7] Y. Kubo, et al. Phys. Rev. Lett. 105 140502 (2010).
[8] M. Blencowe, Nature 468, 44 (2010).
[9] Lev S. Bishop, et al., Nature Phys. 5 105, (2009); R. Houdre, et al., Phys. Rev. A53 2711 (1996); Y. Zhu, et al., Phys. Rev. Lett. 21, 2499 (1990); J. Gripp, et al. Phys. Rev. A54, R3746 (1996); M. G. Raizen, et al. Phys. Rev. Lett. 63 240 (1989).
[10] S. Miyashita, I. Chiorescu and H. De Raedt, in preparation.