Seminars & Lectures
| * TITLE | Two-dimensional Skyrmion Spin Texture in a Spinor Bose-Einstein Condensate | ||||||
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| * HOST(Applicant) | |||||||
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| * DATE / TIME | 2014-03-06, 15:00 | ||||||
| * PLACE | 503 Conference Room | ||||||
| * ABSTRACT | |||||||
| Skyrmions are topological solitions, first proposed to explain the existence of protons and neutrons in high energy physics [1] and two dimensional structures have been studied in a wide range of condensed matter system. In the first part of this talk, I would introduce two-dimensional Skyrmion in an anti-ferromagnetic spinor Bose-Einstein condensate [2]. We create the topological structure by manipulating local spin tilting angle with magnetic field sweep and observe the spin texture dynamics under a constant magnetic field. The spin texture is only stable in few tens of ms and decays into uniform spin texture within a second. Another interesting property of the Skyrmion spin texture is the emergent electromagnetic field. Because of the non-coplanar spin configuration of the spin texture, it can generate gauge potential to a spin carrying particles [3]. In the second part of the presentation, we introduce geometric Hall effect in a spinor Bose-Einstein condensate with the Skyrmion spin texture [4]. Under linear oscillations of the spin texture, a condensate dipole motion resonantly develops into a circular motion in the harmonic trap, demonstrating the existence of an effective Lorentz Force. [1] T. A. Skyrme, Nucl. Phys. 31, 556 (1962). [2] J. Choi, W. J. Kwon, and Y. Shin, Phys. Rev. Lett. 109, 035301 (2012). [3] M. V. Berry, Proc. R. Soc. A 392, 45 (1984). [4] J. Choi, S. Kang, S. W. Seo, W. J. Kwon, and Y. Shin, Phys. Rev. Lett. 111, 245301 (2013). |
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