120 research outputs found
Topologically protected charge transfer along the edge of a chiral -wave superconductor
The Majorana fermions propagating along the edge of a topological
superconductor with pairing deliver a shot noise power of
per eV of voltage bias. We calculate the full
counting statistics of the transferred charge and find that it becomes
trinomial in the low-temperature limit, distinct from the binomial statistics
of charge- transfer in a single-mode nanowire or charge- transfer
through a normal-superconductor interface. All even-order correlators of
current fluctuations have a universal quantized value, insensitive to disorder
and decoherence. These electrical signatures are experimentally accessible,
because they persist for temperatures and voltages large compared to the
Thouless energy.Comment: 5 pages, 4 figures. v3 [post-publication]: added an appendix on the
effect of a tunnel barrier at the normal-superconductor contac
Acceleration of diffusion in ethylammonium nitrate ionic liquid confined between parallel glass plates
The bulk self diffusion of the ethylammonium cation and the nitrate anion can
both be described by respective single diffusion coefficients. Diffusion of the
anion is 1.7 times higher than that of the cation. This indicates no tight
association of the ions in the ionic liquid. For the ethylammonium cation
confined between glass plates the effective diffusion coefficient along, as
well as normal to the confining glass plates is higher by a factor of 1.86 as
compared to that in the bulk. The same time, NMR T2 relaxation of protons of
NH3 group of the EA cation is faster by a factor of 22 than that in bulk. 2H
NMR spectra of selectively labeled CH2 and CH3 groups of EA do not demonstrate
any ordering of the EA between the glass plates. We suggested that these data
favor a model where a bulk isotropic sponge like structure of EAN is saved in
the confinement, but sizes of connecting channels increases. Those leads to
faster translational diffusion and faster exchange processes of protons of NH3
group, in comparison with the bulk.Comment: 11 pages, 5 figures, 1 tabl
Ultrafast dynamics of cold Fermi gas after a local quench
We consider non-equilibrium dynamics of two initially independent reservoirs
and filled with a cold Fermi gas coupled and decoupled by two quantum
quenches following one another. We find that the von Neumann entropy production
induced by the quench is faster than thermal transport between the reservoirs
and defines the short-time dynamics of the system. We analyze the energy change
in the system which adds up the heat transferred between and and the
work done by the quench to uncouple the reservoirs. In the case when and
interact for a short time, we notice an energy increase in both reservoirs
upon decoupling. This energy gain results from the quench's work and does not
depend on the initial temperature imbalance between the reservoirs. We relate
the quench's work to the mutual correlations of and expressed through
their von Neumann entropies. Utilizing this relation, we show that once and
become coupled, their entropies grow (on a timescale of the Fermi time)
faster than the heat flow within the system. This result may provide a track of
quantum correlations' generation at finite temperatures which one may probe in
ultracold atoms, where we expect the characteristic timescale of correlations'
growth to be .Comment: 12 pages, 6 figures (published version
Phonon effects on the double mass differences in magic nuclei.
Theoretical Physic
Subunit Mobility and the Chaperone Activity of Recombinant αB-Crystallin
The comparison of the chaperone-like activity of native and covalently cross-linked human αB-crystallins has confirmed the important role of the subunit mobility in the chaperoning mechanism. Our data clearly demonstrate that the chaperone-like activity of α-crystallin is not only a surface phenomenon as was suggested by some researchers
Valley-momentum locking in a graphene superlattice with Y-shaped Kekulé bond texture
Theoretical Physic
Synthesis, crystal structure and hydrolysis of novel isomeric cage (P-C/P-O)-phosphoranes on the basis of 4,4,5,5-tetramethyl-2-(2-oxo-1,2-diphenylethoxy)-1,3,2-dioxaphospholane and hexafluoroacetone
© The Royal Society of Chemistry 2016.The reaction of 4,4,5,5-tetramethyl-2-(2-oxo-1,2-diphenylethoxy)-1,3,2-dioxaphospholane with hexafluoroacetone leads to the simultaneous formation of regioisomeric cage (P-C/P-O)-phosphoranes, the structures of which are unequivocally confirmed by XRD. The rearrangement of the P-C-isomer to P-O-isomer with high stereoselectivity (>96%) takes place in methylene chloride solution with the retention of the phosphorus coordination. It was found that the stepwise hydrolysis of the P-O-isomer initially gives 2-(2,3-dihydroxy-1,2-diphenyl-3-trifluoromethyl-4,4,4-trifluorobutyloxy)-4,4,5,5-tetramethyl-2-oxo-1,3,2-dioxaphospholane as the only stereoisomer whose structure is also confirmed by XRD. Further hydrolysis of this compound leads to the formation of 2,3-dihydroxy-3-trifluoromethyl-4,4,4-trifluoro-1,2-diphenylbutylphosphate and pinacol, which forms the solvate in the crystal. Hydrolysis of the P-C-isomer yields 2-hydroxy-4,4,5,5-tetramethyl-2-oxo-1,3,2-dioxaphospholane, benzoin and hexafluoroisopropanol
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