Dynamic localization and transport in complex crystals

被引：80

作者：

Longhi, S. ^{[1
,2
]}

机构：

[1] Politecn Milan, CNR, Dipartimento Fis, I-20133 Milan, Italy

[2] Politecn Milan, CNR, Ist Foton & Nanotecnol, I-20133 Milan, Italy

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 23期

关键词：

localised states; NON-HERMITIAN HAMILTONIANS; WAVE-GUIDE ARRAYS; PERIODIC POTENTIALS; DIFFRACTION; SYMMETRY; SPECTRUM;

D O I：

10.1103/PhysRevB.80.235102

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The behavior of a Bloch particle in a complex crystal with PT symmetry subjected to a sinusoidal ac force is theoretically investigated. For unbroken PT symmetry and in the single-band approximation, it is shown that time reversal symmetry of the ac force preserves the reality of the quasienergy spectrum. Like in ordinary crystals, exact band collapse, corresponding to dynamic localization, is attained for a sinusoidal band shape. The wave packet dynamics turns out to be deeply modified at the PT symmetry-breaking point, where band merging occurs and Bragg scattering in the crystal becomes highly nonreciprocal.

引用

页数：6

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