The features of the low-lying spectra of four-body A+B-A+B- systems have been deduced based on symmetry. Using the method of few-body physics, we calculate the
We have studied the effect of hole-doping on the established scenerio of the first-order Mott metal-insulatortransition (MIT) at half-filling using dynamical me
With the help of su(2) algebra technique, a new equivalent form of the fractional Fourier transformation is given. Two examples are illustrated for their physic