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

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.

preprint2013arXivOpen access
Giuseppe Della ValleStefano Longhi
quant-ph
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Open access2 authors1 topic
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Giuseppe Della ValleStefano Longhi

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