VietNam 2013 

IXth Rencontres du Vietnam
Quy-Nhon, August 4-10, 2013


 Nanophysics: from fundamentals to applications

(the return)


Friday 9
Dots and wires

› 11:00 - 11:30 (30min)
Emergent spin electromagnetism induced by magnetization textures in the presence of spin-orbit interaction
Gen Tatara  1@  
1 : RIKEN Center for Emergent Matter Science (CEMS)
2-1 Hirosawa, Wako -  Japan

Magnetic textures in metallic systems induces emergent electromagnetic fields which couples to electrons' spin [1]. These fields have been experimentally observed by use of the anomalous Hall effect and motion of domain wall and vortices [2] and magnetic skyrmion lattice [3].

The spin electromagnetic fields in the presence of spin-orbit interaction has been explored recently [4-7]. It turned out that Rashba interaction introduces a novel spin gauge field resulting in Rashba-induced spin Berry's phase, but the structure of the Maxwell's equation is unchanged [7]. When spin relaxation is present, the emergent fields satisfy the Maxwell's equation but with an emergent monopole term [4]. The newly found monopole is expected to play crucial roles in converting a spin signal into electric one, i.e., in the integration of spintronics into conventional electronics.

[1] Volovik, J. Phys. C, 20, L83 (1987).
[2] Yang et al., Phys. Rev. Lett. 102, 067201 (2009).
[3] Schulz et al., Nat Phys, 8, 301 (2012).
[4] Takeuchi et al., J. Phys. Soc. Jap., 81, 033705; J. Korean Phys. Soc. 61, 1331 (2012).
[5] Kim, Moon, Lee, and Lee, Phys. Rev. Lett. 108, 217202 (2012).
[6] Tatara, Nakabayashi, and Lee, Phys. Rev. B 87, 054403 (2013).
[7] Nakabayashi, preprint.

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