In memory of Leonid Veniaminovich Keldysh. From the archive

Coherent states of excitons

Lebedev Physical Institute, Russian Academy of Sciences, Leninsky prosp. 53, Moscow, 119991, Russian Federation

The concept of a coherent exciton state is formulated. It is shown that for this state the macroscopic wave function may be introduced which satisfies a nonlinear equation of the type familiar in the phenomenological theory of a superfluid liquid. The corresponding nondissipative flux is the flux of energy. For excitons interacting with an electromagnetic field, a coupled system of Maxwell equations and Ginzburg—Pitaevskii (phenomenological theory of Bose liquid) type equations is obtained.

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Keywords: excitons, coherent state of excitons, macroscopic wave function, phenomenological theory of superfluid liqui, Bose-liquid equations, Ginzburg—Pitaevskii equations
PACS: 03.75.Kk, 67.10.−j, 71.35.−y (all)
DOI: 10.3367/UFNe.2017.10.038227
Citation: Keldysh L V "Coherent states of excitons" Phys. Usp. 60 1180–1186 (2017)
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Received: 12th, July 2017, 18th, October 2017

Оригинал: Келдыш Л В «Когерентные состояния экситонов» УФН 187 1273–1279 (2017); DOI: 10.3367/UFNr.2017.10.038227

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