Multiferroic materials, particularly rare-earth orthochromates (RECrO\(_3\)), have garnered significant interest due to their unique magnetic and electric-polar properties, making them promising candidates for multifunctional devices. Although extensive research has been conducted on their antiferromagnetic (AFM) transition temperature (N\(\acute{\mathrm{e}}\)el temperature, \(T_\mathrm{N}\)), ferroelectricity, and piezoelectricity, the effects of doping and substitution of rare-earth
Guanping Xu, Zirui Zhao, Muqing Su & Hai-Feng Li
The XY spin chain is a paradigmatic example of a model solved by free fermions, in which the energy eigenspectrum is built from combinations of quasi-energies. In this article, we show that by extending the XY model’s anisotropy parameter \(\lambda\) to complex values, it is possible for two of the quasi-energies to become degenerate. In the non-Hermitian XY model, these quasi-energy degeneracies give rise to exceptional points (EPs) where eigenvalues and their corresponding eigenvecto
Robert A. Henry, D. C. Liu & Murray T. Batchelor
Over the past four decades, quantum communication has evolved as a dynamic interdisciplinary field, advancing theoretical concepts and practical implementations. This article provides a concise overview focusing on recent progress in different aspects of secure quantum communication and quantum computation protocols, which can be applied to several real-world applications in quantum networks. These protocols guarantee unconditional security while enhancing communication rates and compu
Chitra Shukla, Junaid ur Rehman & Symeon Chatzinotas
Near-term quantum devices offer promising avenues for addressing the electronic structure problem in quantum chemistry, yet their limited qubits and susceptibility to noise constrain algorithmic scalability. Although the variational quantum eigensolver (VQE) has shown potential for small-scale systems, further improvements are necessary to handle large basis sets and large many-electron molecules efficiently. In this work, we introduce RO-VQE, an improved approach derived from the earl
Yoga A. Darmawan, Angga D. Fauzi, Yanoar P. Sarwono & Rui-Qin Zhang
In this work, we introduce an explicit P-wave to construct the diquarks \([qc]_{\widehat{V}}\), then construct the local four-quark currents to explore the hidden-charm tetraquark states with the \(J^{PC}=0^{++}\), \(1^{+-}\), and \(2^{++}\) in the framework of the QCD sum rules at length. Our calculations indicate that the light-flavor SU(3) breaking effects on the tetraquark masses are tiny. The predictions support assigning the X(4475) and X(4500) as the \([uc]_{\widehat{V}}[\overli
Zhi-Gang Wang
The variation of edge confinement modes such as L-mode, H-mode, QH-mode, and I-mode and transitions between these modes in toroidal devices is attributed to interplay between turbulent inflow plasmas from divertor and outflow plasmas from the edge in magnetic configuration with x-point. A concept of flow impedance is introduced to model edge confinement of plasmas in tokamak and stellarator. The core confinement improvement is largely due to effective core heating profile, and direct i
Hyeon K. Park
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