2,457 research outputs found
Electrical Control of Magnetization in Charge-ordered Multiferroic LuFe2O4
LuFe2O4 exhibits multiferroicity due to charge order on a frustrated
triangular lattice. We find that the magnetization of LuFe2O4 in the
multiferroic state can be electrically controlled by applying voltage pulses.
Depending on with or without magnetic fields, the magnetization can be
electrically switched up or down. We have excluded thermal heating effect and
attributed this electrical control of magnetization to an intrinsic
magnetoelectric coupling in response to the electrical breakdown of charge
ordering. Our findings open up a new route toward electrical control of
magnetization.Comment: 14 pages, 5 figure
Separable Pathway Effects of Semi-Competing Risks via Multi-State Models
Semi-competing risks refer to the phenomenon where a primary outcome event
(such as mortality) can truncate an intermediate event (such as relapse of a
disease), but not vice versa. Under the multi-state model, the primary event is
decomposed to a direct outcome event and an indirect outcome event through
intermediate events. Within this framework, we show that the total treatment
effect on the cumulative incidence of the primary event can be decomposed into
three separable pathway effects, corresponding to treatment effects on
population-level transition rates between states. We next propose estimators
for the counterfactual cumulative incidences of the primary event under
hypothetical treatments by generalized Nelson-Aalen estimators with inverse
probability weighting, and then derive the consistency and asymptotic normality
of these estimators. Finally, we propose hypothesis testing procedures on these
separable pathway effects based on logrank statistics. We have conducted
extensive simulation studies to demonstrate the validity and superior
performance of our new method compared with existing methods. As an
illustration of its potential usefulness, the proposed method is applied to
compare effects of different allogeneic stem cell transplantation types on
overall survival after transplantation
Visualization of all two-qubit states via partial-transpose-moments
Efficiently detecting entanglement based on measurable quantities is a basic
problem for quantum information processing. Recently, the measurable quantities
called partial-transpose (PT)-moments have been proposed to detect and
characterize entanglement. In the recently published paper [L. Zhang \emph{et
al.}, \href{https://doi.org/10.1002/andp.202200289}{Ann. Phys.(Berlin)
\textbf{534}, 2200289 (2022)}], we have already identified the 2-dimensional
(2D) region, comprised of the second and third PT-moments, corresponding to
two-qubit entangled states, and described the whole region for all two-qubit
states. In the present paper, we visualize the 3D region corresponding to all
two-qubit states by further involving the fourth PT-moment (the last one for
two-qubit states). The characterization of this 3D region can finally be
achieved by optimizing some polynomials. Furthermore, we identify the dividing
surface which separates the two parts of the whole 3D region corresponding to
entangled and separable states respectively. Due to the measurability of
PT-moments, we obtain a complete and operational criterion for the detection of
two-qubit entanglement.Comment: 29 pages, LaTeX, 8 figures, 2 table
N-(1-Naphthyl)acetoacetamide
The title compound, C14H13NO2, exists in the keto form. An N—H⋯O hydrogen bond helps to establish the packing
{2,2′-[4-Methyl-4-azaheptane-1,7-diylbis(nitrilomethylidyne)]diphenolato}zinc(II)
In the title compound, [Zn(C21H25N3O2)], the ZnII atom is five-coordinate from three N donor atoms and two O donor atoms of the dianion ligand in a distorted trigonal–bipyramidal arrangement. Three methylene groups of the ligand are disordered over two orientations in a 0.555 (6):0.445 (6) ratio
- …