Spin squeezed states in a two-dimensional system

Abstract: The time-evolution of the spin-component fluctuation in a two-dimensional system is studied by a simple quantization scheme of the xy model. The alternate magnetic fields on the two-dimensional plane can effectively modulate the spin fluctuation, and even enable the system to enter into the squeezed states that the fluctuation is below the level of the vacuum fluctuation. The effect of the quantum fluctuation on the magnetic susceptibility of the two-dimensional system is discussed. [Copyright &y& Elsevier]