A solution to the density matrix equation

The authors derive a solution for the density matrix of an electron moving in a spatially periodic field. The solution corresponds to a mixed state of the system.

PACS: 03.65.−w
DOI: 10.1070/PU1990v033n12ABEH002668
URL: https://ufn.ru/en/articles/1990/12/e/
Citation: Vardanyan G A, Mkrtchyan G S "A solution to the density matrix equation" Sov. Phys. Usp. 33 (12) 1072–1072 (1990)

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@article{Vardanyan:1990,
	author = {G. A. Vardanyan and G. S. Mkrtchyan},
	title = {A solution to the density matrix equation},
	publisher = {Physics-Uspekhi},
	year = {1990},
	journal = {Phys. Usp.},
	volume = {33},
	number = {12},
	pages = {1072-1072},
	url = {https://ufn.ru/en/articles/1990/12/e/},
	doi = {10.1070/PU1990v033n12ABEH002668}
}

Оригинал: Варданян Г А, Мкртчян Г С «Об одном решении уравнения для матрицы плотности» УФН 160 (12) 187–188 (1990); DOI: 10.3367/UFNr.0160.199012h.0187