Note on Boson Expansion and Boson Coherent State for the su(2)-Spin System
A. Kuriyama, João da Providência, Y. Tsue +1 more
With the aim of obtaining the classical counterpart of the su(2)-spin system and its quantal fluctuations in the frame of the boson coherent state, the Holstein-Primakoff and Marumori-Yamamura-Tokunaga boson expansions are investigated. The starting point is found in the Schwinger boson representation for the su(2)-spin system and its reformation. Dirac's canonical theory for constraint systems is also applied to the su(2)-spin system. In conclusion, the latter boson expansion is found to be superior to the former with respect to the use of the boson coherent state.
Progress of Theoretical Physics•Jan 1, 1996•1 citation