Abstract-Laser-induced magnetization curve

Shintaro Takayoshi1, Masahiro Sato2, and Takashi Oka3

• 1National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
• 2Department of Physics and Mathematics, Aoyama-Gakuin University, Sagamihara, Kanagawa 252-5258, Japan
• 3Department of Applied Physics, The University of Tokyo, Hongo, Bunkyo, Tokyo 113-8656, Japan

https://www.blogger.com/blogger.g?blogID=124073320791841682#editor/target=post;postID=3111981911959611927

We propose an all optical ultrafast method to highly magnetize general quantum magnets using a circularly polarized terahertz laser. The key idea is to utilize a circularly polarized laser and its chirping. Through this method, one can obtain magnetization curves of a broad class of quantum magnets as a function of time even without any static magnetic field. We numerically demonstrate the laser-induced magnetization process in realistic quantum spin models and find a condition for the realization. The onset of magnetization can be described by a many-body version of Landau-Zener mechanism. In a particular model, we show that a plateau state with topological properties can be realized dynamically.

DOI: http://dx.doi.org/10.1103/PhysRevB.90.214413

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• Published 3 December 2014
• Received 3 February 2014
• Revised 14 November 2014

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