84 citations · 1.3k across the 99 of their papers we have counts for
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Topological Defects in Ferromagnetic, Antiferromagnetic and Cyclic Spinor Condensates -- A Homotopy Theory
Yunbo Zhang, Harri Mäkelä, Kalle-Antti Suominen
We apply the homotopy group theory in classifying the topological defects in atomic spin-1 and spin-2 Bose-Einstein condensates. The nature of the defects depends crucially on the…
Energy band structure and intrinsic coherent properties in two weakly linked Bose Einstein Condensates
Wei-Dong Li, Yunbo Zhang, J. -Q. Liang
The energy band structure and energy splitting due to quantum tunneling in two weakly linked Bose-Einstein condensates were calculated by using the instanton method. The intrinsic…
Homotopy Theory of Topological Defects in Spinor Condensates
Yunbo Zhang, Harri Mäkelä, Kalle-Antti Suominen
We investigate the topological defects in atomic spin-1 and spin-2 Bose-Einstein condensates by applying the homotopy group theory. With this rigorous approach we clarify the previ…
Exact calculation of the skyrmion lifetime in a ferromagnetic Bose condensate
Yunbo Zhang, Wei-Dong Li, Lu Li +1
The tunneling rate of a skyrmion in ferromagnetic spin-1/2 Bose condensates through an off-centered potential barrier is calculated exactly with the periodic instanton method. The…
Periodic Instanton and Phase Transition in Quantum Tunneling of Spin Systems
Y. -B. Zhang, Y. -H. Nie, S. -P. Kou +3
The quantum-classical transitions of the escape rates in a uniaxial spin model relevant to the molecular magnet MnAc and a biaxial anisotropic ferromagnetic particle are inv…