Phys. Rev. Lett. 83, 4373–4376 (1999)Optimal Fluctuations and Tail States of Non-Hermitian OperatorsReceived 23 June 1999; published in the issue dated 22 November 1999 We develop a general variational approach to study the statistical properties of the tail states of a wide class of non-Hermitian operators. The utility of the method, which is a refinement of the instanton approach introduced by Zittartz and Langer [Phys. Rev. 148, 741 (1966)], is illustrated in detail by reference to the problem of a quantum particle propagating in an imaginary scalar potential. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.4373
DOI:
10.1103/PhysRevLett.83.4373
PACS:
72.15.Rn, 05.40.-a, 73.20.Fz
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