Optical-helicity-driven optomagnetic field and photo-spin current in metallic systems
· Invited
Abstract
Interaction among photons, electrons, and spins in condensed matters has opened a research area of opto-spintronics. Circularly polarized photons induce spin density on conduction bands of semiconductors by optical orientation [1, 2], and generate an opto-magnetic field on magnetic moments of insulators by inverse Faraday effect [3, 4]. The observation of optical-helicity-dependent switching of magnetization of metallic ferromagnets has suggested relevant physics in metallic systems [5]. Recently, the opto-magnetic field has been observed in metallic ferromagnets, and its magnitude and direction were explained by interaction energy between angular momentum of photons and magnetization of ferromagnets [6]. For non-magnetic metals, a photo-spin current can occur at interfaces of heavy metals and normal metals due to spin-orbit coupling of heavy metals and inversion symmetry breaking at interfaces [7]. These novel physics enable opto-spintronics in metallic systems with an ultrafast timescale.
References:
1. G. Lampel, Phys. Rev. Lett. 20, 491 (1968).
2. F. Meier and B. P. Zakharchnya, Optical Orientation (North-Holland, Amsterdam, 1984).
3. J. P. van der Ziel, P. S. Pershan, and L. D. Malmstrom, Phys. Rev. Lett. 15, 190 (1965).
4. A. V. Kimel, A. Kirilyuk, P. A. Usachev, R. V. Pisarev, A. M. Balbashov, and Th. Rasing, Nature 435, 655 (2005).
5. C-H. Lambert, S. Mangin, B. S. D. Ch. S. Varaprasad, Y. K. Takahashi, Y. K., Hehn, M. Cinchetti, G. Malinowski, K. Hono, Y. Fainman, M. Aeschlimann, E. E. Fullerton, Science 345, 1337 (2014).
6. G.-M. Choi, A. Schleife, and D. G. Cahill, Nature Commun. 8, 15085 (2017).
7. G.-M. Choi, D.-G. Lee, S.-W. Lee, K. W. Kim, M. Lim, B.-C. Min, K.-J. Lee, and H.-W. Lee, submitted
References:
1. G. Lampel, Phys. Rev. Lett. 20, 491 (1968).
2. F. Meier and B. P. Zakharchnya, Optical Orientation (North-Holland, Amsterdam, 1984).
3. J. P. van der Ziel, P. S. Pershan, and L. D. Malmstrom, Phys. Rev. Lett. 15, 190 (1965).
4. A. V. Kimel, A. Kirilyuk, P. A. Usachev, R. V. Pisarev, A. M. Balbashov, and Th. Rasing, Nature 435, 655 (2005).
5. C-H. Lambert, S. Mangin, B. S. D. Ch. S. Varaprasad, Y. K. Takahashi, Y. K., Hehn, M. Cinchetti, G. Malinowski, K. Hono, Y. Fainman, M. Aeschlimann, E. E. Fullerton, Science 345, 1337 (2014).
6. G.-M. Choi, A. Schleife, and D. G. Cahill, Nature Commun. 8, 15085 (2017).
7. G.-M. Choi, D.-G. Lee, S.-W. Lee, K. W. Kim, M. Lim, B.-C. Min, K.-J. Lee, and H.-W. Lee, submitted
*The authors acknowledge the National Research Council of Science & Technology (NST) grant funded by the Korea government (MSIP) (CAP-16-01-KIST).
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Presenters
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Gyung-Min Choi
- Sungkyunkwan Univ