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[Fizinfo] BME Elm. Fiz. Szeminárium, nov. 19, Doru Sticlet

From: Janos Asboth <asboth.janos AT ttk.bme.hu>
To: fizinfo AT lists.kfki.hu, elmfiz.oktatok-kutatok AT lists.bme.hu, elmfiz.hallgatok AT lists.bme.hu
Subject: [Fizinfo] BME Elm. Fiz. Szeminárium, nov. 19, Doru Sticlet
Date: Wed, 17 Nov 2021 21:35:26 +0100
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Meghívó

BME Elméleti Fizika Szeminárium,

nov. 19. péntek 10h15,

1111 Budapest, Budafoki út 8., BME F III. magasföldszint 01.,
Elméleti Fizika Tanszék szemináriumi szoba

Doru Sticlet (National Institute for R&D of Isotopic and Molecular
Technologies, 67-103 Donat, 400293 Cluj-Napoca, Romania):

Non-Hermitian Linear Response Theory

Linear response theory has a large applicability in physics as it often
gives the leading order response of a system to an external probe. We
develop an extension of the theory to the domain of non-Hermitian quantum
mechanics and exemplify the salient features of this theory through two
examples: (1) a one-dimensional tachyon under the effect of electric
field-like perturbations and (2) a free electron gas perturbed by
non-Hermitian scalar potentials. We show that these contain striking
predictions for the behavior of expectation values in the non-Hermitian
realm such as a finite electrical DC conductivity in (1) and suppression of
Friedel oscillations in (2).

References:
[1] D. Sticlet, B. Dora, C.P. Moca, Kubo formula for non-Hermitian systems
and tachyon optical conductivity, arXiv:2104.02428 (2021).
[2] B. Dora, D. Sticlet, C.P. Moca, Non-Hermitian Lindhard function and
Friedel oscillations, Phys. Rev. B 104, 125113 (2021).

Minden érdeklődőt szeretettel várunk.

Asbóth János
szemináriumi koordinátor

[Fizinfo] BME Elm. Fiz. Szeminárium, nov. 19, Doru Sticlet, Janos Asboth, 11/17/2021