8,511 research outputs found
Recent Progress of Multiferroic Perovskite Manganites
Many multiferroic materials, with various chemical compositions and crystal
structures, have been discovered in the past years. Among these multiferroics,
some perovskite manganites with ferroelectricity driven by magnetic orders are
of particular interest. In these multiferroic perovskite manganites, not only
their multiferroic properties are quite prominent, but also the involved
physical mechanisms are very plenty and representative. In this Brief Review,
we will introduce some recent theoretical and experimental progress on
multiferroic manganites.Comment: 24 pages, 17 figures. A brief revie
The spectral radius of minor free graphs
In this paper, we present a sharp upper bound for the spectral radius of an
-vertex graph without -minor for sufficient large , where is
obtained from the complete graph by deleting disjointed paths.
Furthermore, the graphs which achieved the sharp bound are characterized. This
result may be regarded to be an extended revision of the number of edges in an
-vertex graph without -minor.Comment: 18 pages, 1 figur
Quantum-memory-assisted entropic uncertainty relations
Uncertainty relations take a crucial and fundamental part in the frame of
quantum theory, and are bringing on many marvelous applications in the emerging
field of quantum information sciences. Especially, as entropy is imposed into
the uncertainty principle, entropy-based uncertainty relations lead to a number
of applications including quantum key distribution, entanglement witness,
quantum steering, quantum metrology, and quantum teleportation. Herein, the
history of the development of the uncertainty relations is discussed,
especially focusing on the recent progress with regard to
quantum-memory-assisted entropic uncertainty relations and dynamical
characteristics of the measured uncertainty in some explicit physical systems.
The aims are to help deepen the understanding of entropic uncertainty relations
and prompt further explorations for versatile applications of the relations on
achieving practical quantum tasks.Comment: Review, 20 pages, published in Ann. Phys. (Berlin
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