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arXiv · 2304.07950

Non-Hermitian Quantum Fermi Accelerator

Andreas Fring·Takano Taira
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Abstract

We exactly solve a quantum Fermi accelerator model consisting of a time-independent non-Hermitian Hamiltonian with time-dependent Dirichlet boundary conditions. A Hilbert space for such systems can be defined in two equivalent ways, either by first constructing a time-independent Dyson map and subsequently unitarily mapping to fixed boundary conditions or by first unitarily mapping to fixed boundary conditions followed by the construction of a time-dependent Dyson map. In turn this allows to construct time-dependent metric operators from a time-independent metric and two time-dependent unitary maps that freeze the moving boundaries. From the time-dependent energy spectrum, we find the known possibility of oscillatory behavior in the average energy in the PT-regime, whereas in the spontaneously broken PT-regime we observe the new feature of a one-time depletion of the energy. We show that the PT broken regime is mended with moving boundary, equivalently to mending it with a time-dependent Dyson map.

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Andreas Fring, Takano Taira. 2023-04-17. Non-Hermitian Quantum Fermi Accelerator. https://doi.org/10.1103/physreva.108.012222

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