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arXiv 1412.7630quant-ph
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非厄米型Aharonov-Bohm干涉仪在光谱奇异点附近的透射相位衰减

Transmission phase lapse in the non-Hermitian Aharonov-Bohm interferometer near the spectral singularity

G. Zhang, X. Q. Li, X. Z. Zhang, Z. Song

摘要:

通过求解一个具体的紧束缚系统的精确解,研究了嵌入Aharonov-Bohm干涉仪两臂的PT对称虚势对透射相位的影响.我们观察到,在很宽的通量和虚势范围内,谱奇异性总是出现在k= ${\pm}$ π/2处.与物理的光谱奇异性的临界行为也进行了研究。结果表明,准谱奇异性对应于一个透射极大值,当系统扫过该点时,透射相位突变π.此外,我们发现当虚势接近谱奇异性的边界值时,存在脉冲状的相位消失。

英文摘要:

We study the effect of PT-symmetric imaginary potentials embedded in the two arms of an Aharonov-Bohm interferometer on the transmission phase by finding an exact solution for a concrete tight-binding system. It is observed that the spectral singularity always occurs at k=${\pm}$π/2 for a wide range of fluxes and imaginary potentials. Critical behavior associated with the physics of the spectral singularity is also investigated. It is demonstrated that the quasi-spectral singularity corresponds to a transmission maximum and the transmission phase jumps abruptly by π when the system is swept through this point. Moreover, We find that there exists a pulse-like phase lapse when the imaginary potential approaches the boundary value of the spectral singularity.

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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