Spontaneous and persistent currents in superconductive and mesoscopic structures (Review Article)

We briefly review aspects of superconductive persistent currents in Josephson junctions of the S/I/S, S/O/S and S/N/S types, focusing on the origin of jumps in the current versus phase dependences, and discuss in more detail the persistent as well as «spontaneous» currents in the Aharonov–Bohm me...

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Date:	2004
Main Author:	Kulik, I.O.
Format:	Article
Language:	English
Published:	Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2004
Subjects:	Сверхпроводимость и мезоскопические структуры
Online Access:	https://nasplib.isofts.kiev.ua/handle/123456789/119787
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Journal Title:	Digital Library of Periodicals of National Academy of Sciences of Ukraine
Cite this:	Spontaneous and persistent currents in superconductive and mesoscopic structures (Review Article) / I.O. Kulik // Физика низких температур. — 2004. — Т. 30, № 7-8. — С. 705-713. — Бібліогр.: 79 назв. — англ.

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Digital Library of Periodicals of National Academy of Sciences of Ukraine

id	nasplib_isofts_kiev_ua-123456789-119787
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spelling	Kulik, I.O. 2017-06-09T14:07:47Z 2017-06-09T14:07:47Z 2004 Spontaneous and persistent currents in superconductive and mesoscopic structures (Review Article) / I.O. Kulik // Физика низких температур. — 2004. — Т. 30, № 7-8. — С. 705-713. — Бібліогр.: 79 назв. — англ. 0132-6414 PACS: 73.23.–b, 74.50.+r https://nasplib.isofts.kiev.ua/handle/123456789/119787 We briefly review aspects of superconductive persistent currents in Josephson junctions of the S/I/S, S/O/S and S/N/S types, focusing on the origin of jumps in the current versus phase dependences, and discuss in more detail the persistent as well as «spontaneous» currents in the Aharonov–Bohm mesoscopic and nanoscopic (macromolecular) structures. A fixed-number-of-electrons mesoscopic or macromolecular conducting ring is shown to be unstable against structural transformation removing spatial symmetry (in particular, azimuthal periodicity) of its electron- lattice Hamiltonian. In case when the transformation is blocked by strong coupling to an external azimuthally symmetric environment, the system becomes bistable in its electronic configuration at certain number of electrons. At such a condition, the persistent current has a nonzero value even at the (almost) zero applied Aharonov–Bohm flux, and results in very high magnetic susceptibility dM/dH at small nonzero fields, followed by an oscillatory dependence at larger fields. We tentatively assume that previously observed oscillatory magnetization in cyclic metallo-organic molecules by Gatteschi et al. can be attributed to persistent currents. If this proves correct, it may open an opportunity (and, more generally, macromolecular cyclic structures may suggest the possibility) of engineering quantum computational tools based on the Aharonov–Bohm effect in ballistic nanostructures and macromolecular cyclic aggregates. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Сверхпроводимость и мезоскопические структуры Spontaneous and persistent currents in superconductive and mesoscopic structures (Review Article) Article published earlier
institution	Digital Library of Periodicals of National Academy of Sciences of Ukraine
collection	DSpace DC
title	Spontaneous and persistent currents in superconductive and mesoscopic structures (Review Article)
spellingShingle	Spontaneous and persistent currents in superconductive and mesoscopic structures (Review Article) Kulik, I.O. Сверхпроводимость и мезоскопические структуры
title_short	Spontaneous and persistent currents in superconductive and mesoscopic structures (Review Article)
title_full	Spontaneous and persistent currents in superconductive and mesoscopic structures (Review Article)
title_fullStr	Spontaneous and persistent currents in superconductive and mesoscopic structures (Review Article)
title_full_unstemmed	Spontaneous and persistent currents in superconductive and mesoscopic structures (Review Article)
title_sort	spontaneous and persistent currents in superconductive and mesoscopic structures (review article)
author	Kulik, I.O.
author_facet	Kulik, I.O.
topic	Сверхпроводимость и мезоскопические структуры
topic_facet	Сверхпроводимость и мезоскопические структуры
publishDate	2004
language	English
publisher	Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
format	Article
description	We briefly review aspects of superconductive persistent currents in Josephson junctions of the S/I/S, S/O/S and S/N/S types, focusing on the origin of jumps in the current versus phase dependences, and discuss in more detail the persistent as well as «spontaneous» currents in the Aharonov–Bohm mesoscopic and nanoscopic (macromolecular) structures. A fixed-number-of-electrons mesoscopic or macromolecular conducting ring is shown to be unstable against structural transformation removing spatial symmetry (in particular, azimuthal periodicity) of its electron- lattice Hamiltonian. In case when the transformation is blocked by strong coupling to an external azimuthally symmetric environment, the system becomes bistable in its electronic configuration at certain number of electrons. At such a condition, the persistent current has a nonzero value even at the (almost) zero applied Aharonov–Bohm flux, and results in very high magnetic susceptibility dM/dH at small nonzero fields, followed by an oscillatory dependence at larger fields. We tentatively assume that previously observed oscillatory magnetization in cyclic metallo-organic molecules by Gatteschi et al. can be attributed to persistent currents. If this proves correct, it may open an opportunity (and, more generally, macromolecular cyclic structures may suggest the possibility) of engineering quantum computational tools based on the Aharonov–Bohm effect in ballistic nanostructures and macromolecular cyclic aggregates.
issn	0132-6414
url	https://nasplib.isofts.kiev.ua/handle/123456789/119787
citation_txt	Spontaneous and persistent currents in superconductive and mesoscopic structures (Review Article) / I.O. Kulik // Физика низких температур. — 2004. — Т. 30, № 7-8. — С. 705-713. — Бібліогр.: 79 назв. — англ.
work_keys_str_mv	AT kulikio spontaneousandpersistentcurrentsinsuperconductiveandmesoscopicstructuresreviewarticle
first_indexed	2025-12-07T18:54:43Z
last_indexed	2025-12-07T18:54:43Z
_version_	1850876817814061056

Spontaneous and persistent currents in superconductive and mesoscopic structures (Review Article)

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