|
ИСТИНА |
Войти в систему Регистрация |
ИПМех РАН |
||
Topology of gap nodes in superfluid 3He: pi4 homotopy group for 3 He-B disclinationстатья
Информация о цитировании статьи получена из
Scopus,
Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 22 декабря 2014 г.
- Авторы: Grinevich P.G., Volovik G.E.
- Журнал: Journal of Low Temperature Physics
- Том: 72
- Номер: 5
- Год издания: 1988
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- Первая страница: 371
- Последняя страница: 380
- DOI: 10.1007/BF00682148
- Аннотация: The topologically stable zeros in the energy spectrum of Fermi excitations in superfluid 3He both in uniform phases and in textures are classified. This generalizes the classification of the defects of the order parameter in real coordinate space to the classification of zeros in the gap, which are the more general defects in coherent superfluid or superconducting states both in real space and momentum k space. The zeros are described by classes of mappings of the spherical surfaces S^n, embracing the 6-n-1-dimensional manifold of zeros in six-dimensional (k,r) space, into the space of the Bogolyubov- Nambu matrices, which describe the Fermi excitations. The examples of topologically nontrivial manifolds of zeros are discussed, including the closed line of zeros in five-dimensional space, which is described by the pi_4 homotopy groups and exists in the core of the 3He-B disclination. This object demonstrates the coupling between the real space topology of disclination and the extended space topology of zeros in the disclination core.
- Добавил в систему: Гриневич Петр Георгиевич