Theoretical Physics III, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany.
Phys Rev Lett. 2012 Sep 14;109(11):116405. doi: 10.1103/PhysRevLett.109.116405. Epub 2012 Sep 13.
We report a bound state of the one-dimensional two-particle (bosonic or fermionic) Hubbard model with an impurity potential. This state has the Bethe-ansatz form, although the model is nonintegrable. Moreover, for a wide region in parameter space, its energy is located in the continuum band. A remarkable advantage of this state with respect to similar states in other systems is the simple analytical form of the wave function and eigenvalue. This state can be tuned in and out of the continuum continuously.
我们报告了一维双粒子（玻色或费米子）Hubbard 模型与杂质势的束缚态。尽管模型是非积分的，但这个态具有 Bethe 解的形式。此外，在参数空间的一个广泛区域内，它的能量位于连续能带中。与其他系统中的类似态相比，这个态的一个显著优点是波函数和本征值的简单解析形式。这个态可以连续地在连续能带中调谐。
