2,377 research outputs found
1-{2-[(2,4-Dichlorobenzylidene)amino]ethyl}-3-methylimidazolium hexafluorophosphate
In the title Schiff base compound, C13H14Cl2N3
+·PF6
−, the dihedral angle between the aromatic ring and imidazole ring in the cation is 6.10 (2)°. Intermolecular C—H⋯F hydrogen-bonding interactions and π–π stacking interactions [centoid–centroid distance = 3.7203 (12) Å] help stabilize the crystal packing
Coexistence of directed momentum current and ballistic energy diffusion in coupled non-Hermitian kicked rotors
We numerically investigate the quantum transport in a coupled kicked rotors
with the -symmetric potential. We find that the spontaneous
-symmetry breaking of wavefunctions emerges when the amplitude of
the imaginary part of the complex potential is beyond a threshold value, which
can be modulated by the coupling strength effectively. In the regime of the
-symmetry breaking, the particles driven by the periodical kicks
move unidirectionally in momentum space, indicating the emergence of a directed
current. Meanwhile, with increasing the coupling strength, we find a transition
from the ballistic energy diffusion to a kind of the modified ballistic energy
diffusion where the width of the wavepacket also increases with time in a power
law. Our findings suggest that the decoherence effect induced by the interplay
between the inter-particle coupling and the non-Hermitian driving potential is
responsible for these particular transport behaviors.Comment: 8 pages, 7 figure
Bis(2,6-dichlorobenzyl)selane
The title molecule, C14H10Cl4Se, features a selenide bridge between two dichlorobenzyl units. The dihedral angle between the two benzene rings is 107.9 (16)°. In the crystal, weak π–π face-to-face aromatic interactions are observed [centroid–centroid distance between two adjacent (but crystallographically different) phenyl rings = 3.885 (5) Å], providing some packing stability. Short Cl⋯Cl contacts of 3.41 (2) Å are observed
Necessary conditions for classifying m-separability of multipartite entanglements
We study the norms of the Bloch vectors for arbitrary -partite quantum
states. A tight upper bound of the norms is derived for -partite systems
with different individual dimensions. These upper bounds are used to deal with
the separability problems. Necessary conditions are presented for -separable states in -partite quantum systems. Based on the upper bounds,
classification of multipartite entanglement is illustrated with detailed
examples.Comment: 14 page
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