2,388 research outputs found
Interplay between classical magnetic moments and superconductivity in quantum one-dimensional conductors: toward a self-sustained topological Majorana phase
We study a one-dimensional (1D) interacting electronic liquid coupled to a 1D
array of classical magnetic moments and to a superconductor. We show that at
low energy and temperature the magnetic moments and the electrons become
strongly entangled and that a magnetic spiral structure emerges without any
adjustable parameters. For strong enough coupling between the two, the 1D
electronic liquid is driven into a topological superconducting phase supporting
Majorana fermions without any fine-tuning of external parameters. Our analysis
applies at low enough temperature to a quantum wire in proximity of a
superconductor when the hyperfine interaction between electrons and nuclear
spins is taken into account or to a chain of magnetic adatoms adsorbed on a
superconducting surface.Comment: 7 pages, 2 figures, final versio
Nuclear magnetism and electron order in interacting one-dimensional conductors
The interaction between localized magnetic moments and the electrons of a
one-dimensional conductor can lead to an ordered phase in which the magnetic
moments and the electrons are tightly bound to each other. We show here that
this occurs when a lattice of nuclear spins is embedded in a Luttinger liquid.
Experimentally available examples of such a system are single wall carbon
nanotubes grown entirely from 13C and GaAs-based quantum wires. In these
systems the hyperfine interaction between the nuclear spin and the conduction
electron spin is very weak, yet it triggers a strong feedback reaction that
results in an ordered phase consisting of a nuclear helimagnet that is
inseparably bound to an electronic density wave combining charge and spin
degrees of freedom. This effect can be interpreted as a strong renormalization
of the nuclear Overhauser field and is a unique signature of Luttinger liquid
physics. Through the feedback the order persists up into the millikelvin range.
A particular signature is the reduction of the electric conductance by the
universal factor 2.Comment: 30 pages, 10 figures; Sec. II contains a 2+ pages summary giving a
complete overview to the main conditions and results; v3: updated references,
typos correcte
Peter Raschig zum 75. Geburtstag
Peter Raschig wurde am 30. Juli 1934 in Berlin geboren. Seine Kindheit und Jugend verbrachte er bereits in Jessen und hier ist bis heute sein Lebensmittelpunkt. Nach 75 Lebensjahren zählt er nunmehr zu den „Alten Jessnern“. Viele seiner Aktivitäten haben deutliche Spuren hinterlassen, durch die er bei fast jedermann in der Stadt und darüber hinaus bekannt ist. Als Mitglied der Fachgruppe Ornithologie in Jessen erfasst und beringt Peter Raschig schon seit 1971 Weißstörche. Seit 1976 arbeitet er erfolgreich im Arbeitskreis „Weißstorch“ mit, zu dessen Gründungsmitgliedern er zählt. Lange Zeit war er zusätzlich federführend im Biberschutz tätig. So koordinierte er die Bestandserfassungen im Altkreis Jessen und organisierte die Bergung von Totfunden. Im Jahr 1978 wurde Peter Raschig zum Kreisnaturschutzbeauftragten des Altkreises Jessen berufen. Er arbeitet noch heute aktiv als Naturschutzbeauftragter des Landkreises Wittenberg
Designing Learning Information Systems to Customer Needs
The paper presents a marketing-oriented approach to the analysis and design of learning IS. In order to explain the phenomenon of success and failure of learning IS the term “user net value” is introduced. Using this concept, recommendations for a successful design and implementation of learning IS are presented
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