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arXiv 1012.4475quant-phcond-mat.othercond-mat.quant-gas
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鲁棒$\mP\mT$ -对称链及其Hermite对应链的性质

The robust $\mP\mT$-symmetric chain and properties of its Hermitian counterpart

Yogesh N. Joglekar, Avadh Saxena

摘要:

研究了具有位置依赖跳跃幅度的N重宇称和时间反转对称紧束缚链的性质。与此相反,脆弱的PT对称相的链与恒定的跳跃和虚杂质的潜力,我们表明,在非常一般的条件下,我们的模型是{ \it总是}在PT对称相。我们数值计算了这种链的能谱和态密度,并表明它们是宽调谐的。通过研究反参与比的大小依赖性,我们表明,虽然链是不对称不变的,它的大部分本征态是扩展的。我们的结果表明,紧束缚模型与非厄米PT对称跳跃有一个强大的PT对称相位和丰富的动力学,可以探索在耦合波导。

英文摘要:

We study the properties of a parity- and time-reversal- (PT) symmetric tight-binding chain of size N with position-dependent hopping amplitude. In contrast to the fragile PT-symmetric phase of a chain with constant hopping and imaginary impurity potentials, we show that, under very general conditions, our model is {\it always} in the PT-symmetric phase. We numerically obtain the energy spectrum and the density of states of such a chain, and show that they are widely tunable. By studying the size-dependence of inverse participation ratios, we show that although the chain is not translationally invariant, most of its eigenstates are extended. Our results indicate that tight-binding models with non-Hermitian PT-symmetric hopping have a robust PT-symmetric phase and rich dynamics which may be explored in coupled waveguides.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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