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The influence of time-dependent impurity on the electronic and transport properties of the tilted superlattices modeled by the tight-binding Hamiltonian is investigated. The quasienergies of the system are calculated in two methods: exact diagonalization and Floquet replica technique, the subtle effects of the impurity on the dynamics of the system are discussed in detail. Through a perturbative analysis...
The quantum phase transitional behavior of the U(3) boson model is studied. Low-lying levels, overlaps of wavefunctions with those in the d-wave dominant and s- and d-wave mixed phases, as well as ground state occupation probabilities of s- and d-components are examined as functions of the control parameter and the number of particles. The results indicated that the s- and d-wave component change...
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