'Spin Turbulence in Spinor Bose-Einstein Condensates' Makoto Tsubota

[Semiar]
Spin Turbulence in Spinor Bose-Einstein Condensates
Prof. Makoto Tsubota
Osaka City University, Japan

• Date: Thursday, 19 February
• Time: 15:00-16:00
• Venue: B503, Level B, Lab1

Abstract:
I discuss spin turbulence (ST) in spinor Bose-Einstein condnesates (BECs).  When the system is excited from the ground state, appears ST where the spin density vectors are spatially disordered (See the figure) [1].  ST is characterized by the novel -7/3 power law in the spectrum of the spin-dependent interaction energy.  The direction of the spin density vector is spatially disordered but temporally frozen in ST, showing some analogy with spin glass state [2]. When we introduce the order parameter of spin glass into ST, it grows with the appearance of the -7/3 power law. ST allows turbulence not only of spins but also of superfluids, the two kinds of turbulence sustaining each other through interaction [3].

References
[1] K. Fujimoto, M. Tsubota. Phys. Rev. A85, 033642 (2012); Phys. Rev. A85, 053641 (2012).
[2] M. Tsubota, Y. Aoki, K. Fujimoto, Phys. Rev. A88, 061601(R) (2013).
[3] K. Fujimoto, M. Tsubota, Phys. Rev. A90, 013629(2014).

Quantum Systems Unit