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

The Electron-Ion Collider (EIC) is the world’s first electron + heavy-ion collider, and also performs polarized electron + polarized proton and light ion collisions, that will be constructed at Brookhaven National Laboratory in the USA. It will explore new areas of quantum chromodynamics (QCD) and foster the richness of nuclear and hadron physics. The EIC program will produce many new and very extensive results in nuclear and hadron physics over the next few decades. As an internationa

Yuji Goto, Taku Gunji, Yongsun Kim & Chia Ming Kuo

Magnetic resonance wireless power transfer (WPT) has emerged as a pivotal technology for near-field electromagnetic manipulation, enabling wire-free energy delivery across diverse applications ranging from consumer electronics and implantable medical devices to electric vehicles. While near-field coupling facilitates this paradigm shift, it imposes inherent constraints: the exponential decay of coupling strength fundamentally limits transfer distance to short-to-mid ranges, and complex

Luyao Wan, Han Zhang, Xian Wu, Yang Xu, Yunhui Li, Yaping Yang, Hong Chen & Zhiwei Guo

By using both diagrammatic theory and Chevy ansatz approach, we derive an exact set of equations, which determines the spectral function of Fermi polarons with multiple particle-hole excitations at nonzero temperature. In the diagrammatic theory, we find out the complete series of Feynman diagrams for the multi-particle vertex functions, when the unregularized contact interaction strength becomes infinitesimal, a typical situation occurring in two- or three-dimensional free space. The

Hui Hu, Jia Wang & Xia-Ji Liu

We attempt to propose the first orthogonal-state-based protocols of measurement-device-independent quantum secure direct communication and quantum dialogue employing single basis, i.e., Bell basis as decoy qubits for eavesdropping detection. Orthogonal-state-based protocols are inherently distinct from conventional conjugate-coding protocols, offering unconditional security derived from the duality and monogamy of entanglement. Noise imposes a major challenge to the efficient implement

Chitra Shukla, Abhishek Shukla, Symeon Chatzinotas & Milos Nesladek