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arXiv 1306.1048quant-ph
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时间周期PT对称紧束缚晶格的光谱和输运性质

Spectral and transport properties of time-periodic PT-symmetric tight-binding lattices

Giuseppe Della Valle, Stefano Longhi

摘要:

研究了一维紧束缚晶格上时间周期PT对称哈密顿量的谱性质和动力学特征。结果表明,高频调制可以驱动系统之间的过渡破PT和未破PT阶段。在未破碎的PT制度的时间周期性调制的准能谱的显着加宽的结果,导致超弹道输运制度。此外,在PT对称性破缺附近,晶格带的色散曲线变为线性,量子波包扩展大大减少。

英文摘要:

We investigate the spectral properties and dynamical features of a time-periodic PT-symmetric Hamiltonian on a one-dimensional tight-binding lattice. It is shown that a high-frequency modulation can drive the system under a transition between the broken-PT and the unbroken-PT phases. The time-periodic modulation in the unbroken-PT regime results in a significant broadening of the quasi-energy spectrum, leading to a hyper-ballistic transport regime. Also, near the PT-symmetry breaking the dispersion curve of the lattice band becomes linear, with a strong reduction of quantum wave packet spreading.

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