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arXiv 1310.7752quant-ph
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一种新的PT对称非厄米特势的各种散射性质

Various Scattering Properties of a New PT-symmetric non-Hermitian potential

Ananya Ghatak, Raka Dona Ray Mandal, Bhabani Prasad Mandal

摘要:

我们复化了一个具有束缚态、反射态和自由态的一维势,研究了非厄米系统的各种性质。当其中一个参数变为虚数时,这个势就变成PT对称的非厄米特势。对于一个PT对称的情况下,我们有整个实束缚态谱。显式散射态被构造为在某些离散能量值下显示互易性,即使势不是宇称对称的。观察到transmittance的深能量极小值与多重谱奇异性(MSS)共存。我们进一步表明,这种潜力变得不可见的左(或右)在某些离散的能量。在另一种PT对称构型中,穿透态总是互易的,即使它是PT不变的,并且在这种情况下不存在谱奇异性(SS)。MSS和反射的存在下,也讨论了在后一种情况下的自由态。

英文摘要:

We complexify a 1-d potential which exhibits bound, reflecting and free states to study various properties of a non-Hermitian system. This potential turns out a PT-symmetric non-Hermitian potential when one of the parameters becomes imaginary. For one PT-symmetric case we have entire real bound state spectrum. Explicit scattering states are constructed to show reciprocity at certain discrete values of energy even though the potential is not parity symmetric. Coexistence of deep energy minima of transmissivity with the multiple spectral singularities (MSS) is observed. We further show that this potential becomes invisible from left (or right) at certain discrete energies. The penetrating states in the other PT-symmetric configuration are always reciprocal even though it is PT-invariant and no spectral singularity (SS) is present in this case. Presence of MSS and reflectionlessness are also discussed for the free states in the later case.

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